diff --git a/day-12/input/vanyle.txt b/day-12/input/vanyle.txt
new file mode 100644
index 0000000..77f603f
--- /dev/null
+++ b/day-12/input/vanyle.txt
@@ -0,0 +1,1000 @@
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+??????????? 3,1,1
+##??#?#???????# 5,1,4,1
+?#???##?.??#??#????? 3,3,1,9
+#????#.????#.?? 3,1,1,1,1
+.??#.?#.??#?? 1,1,2,3
+?.??##?##????.??.#.? 1,7,1,1,1
+##???????.? 2,2
+??#??.?#????. 2,1,3
+?....#?#??. 1,1
+??##??.?.??#? 4,1,1,2
+??..?.?????# 1,1,1,1
+.??.?????? 1,1
+????#??..?#?#??#. 4,7
+?##????#.??# 3,3,3
+?#?#????.##?#?? 5,1,2,1,1
+.#?#???.##? 1,4,2
+.??????..?#??? 1,3,3,1
+?##??#??.????? 6,1,1
+.???.??... 1,1
+.##???###???#?#?? 14,1
+#?#?????###?.?????. 3,5,3
+???.?#?#??#?????.?? 1,1,7,1,2,1
+???#?.??##?? 1,4
+#?#.???#???. 3,4
+???.?.???.#???#? 1,1,2,1,2
+..#??????#???? 4,4
+.#???????????#??.. 1,3,6,1
+.????###???#? 1,1,5,1
+?.??????#???...?? 2,5
+?????#??????.??#???? 7,1,3,1
+??#?#..#??.#??? 2,1,2,1,1
+.?#?.?#??#? 1,5
+#???##??????????? 1,10,1
+????#?###?#?.??.?.# 3,8,1,1,1
+??.##????##. 3,1,2
+.??##.?.??? 2,2
+?#?#???????????##??? 11,4
+?.?????#?.????#?? 1,1,1,1,4
+?#?##?????##??????? 2,12,1
+?????????#????.??? 10,1
+???.#???.? 2,4
+?#????.?#.?#?..#?## 2,1,2,2,1,2
+???.#?#?#.?????? 5,2
+.##??#?#??#?? 7,3
+#.????#?#?#????.?? 1,3,7,1
+??##???#???#??.?#?? 10,3
+????#?????#. 4,1
+?????.???? 4,1
+?##??????#?##.? 2,7
+.?##?????#?#?? 6,1,1,1
+???????.???##?? 1,2,5
+.?.??#????#??#??###. 1,1,12
+??#??#???#.????. 5,3,2
+?##??#??.???#??? 8,6
+?##??.???????? 5,1,2,1
+?.???.?.????#???# 1,3,1,2,5
+??#?#????#???#??#. 3,2,9
+?#.??????.??????? 2,1,1,1,4
+?????#?????. 2,1,2,1
+???.??#?#..???# 2,1,1,1,1
+?#????????. 2,1,1
+???#??..??.??#??. 3,3
+????????..?? 2,1,1,1
+.??..??#...?#.???# 1,3,2,3
+?????###??.?? 4,1
+????#?????? 6,1,1
+.???????#??## 3,6
+.?.???#???????#? 1,10,1
+?#.???#??#?#???? 1,4,8
+.??????##??? 1,4
+#??##.?????#???##??? 1,3,1,8,1
+????#????#?###????# 3,1,7,2,1
+??.????###?????? 1,1,7
+?#?#?.???.##? 4,1,2
+????.?..???#?#? 4,1,1,5
+?#???.?#??. 1,2
+#??#????????????. 1,7,1,1,1
+.?#..#?.##?#.??? 2,1,4,2
+??.???.??#????#??#? 1,1,1,6,1,2
+?..#??#.##?.#. 4,3,1
+???###??##????# 1,7,2,1
+###?????###?#??#..?? 13,1,1
+.#?????#??? 1,6
+?#??#??.??.?.? 6,1,1,1
+.#??.?#..?#??? 3,1,4
+??#??.?##??? 1,1,4,1
+.#????#?#.?#?#?##??? 8,7,1
+?#??#?#.???????. 7,3
+#?.??#??##??????. 2,6,2
+.#??#?#??.? 1,5
+.????#??????#??? 2,7,3
+.???#?#????.? 1,4,1,1
+?#..???.#? 1,2,2
+.#??????###????? 6,7
+?.????.???#?? 1,1,1,2
+??..??????.##?##???. 2,6
+.#?#..?#????.?? 3,5
+.#?#?????????? 5,1,1,1
+.?.???#?#??.? 1,3
+???#.?#?..????#?###? 2,2,8
+.?#???.?.???##?.?.? 2,1,5,1,1
+???????..#?##? 2,1,1,2
+.?#?????.??#. 3,1,1,1
+???#????#??.?.#?? 1,8,1,1,1
+?????.????#??#?#? 3,11
+#..?.#????#??#?..? 1,9,1
+#.?.?#??.??? 1,1,3,2
+????.????.?##???? 1,1,2,3,1
+..??.?..???.?.?? 1,1
+.???.##??#??#???? 1,1,6,1,1
+#.#?????????# 1,1,3,2
+#??#?#???.?????.? 1,5,1,1,1
+??.###???..? 5,1
+?#?#??##??#??.??. 4,7
+??#?????????? 5,3
+?#???#???. 2,2
+??#??#?#??#?? 6,1,1
+?.???#.?#?# 1,3,3
+???#??????#???#?. 1,10,1
+?.?#?##?.?? 1,4,1
+#??##??.????#??. 1,3,6
+#.???????#? 1,2,2
+?#?#??.?.?#?#.?#? 3,1,1,3,2
+??#???.?#?????? 2,1,6
+.??#???##???# 1,2,7
+??#??#???#?#?.?.?. 1,1,8,1
+##???.?..??#?? 2,1,1,2
+?#..????.????????#?. 2,2,10
+??##?..?##????###.?? 4,10
+?#?..??.?? 1,1,1
+??????#??..??????.#? 8,1,1,1,1
+???????.#?????..??.? 2,1,5,2,1
+#?#????????##??? 4,1,1,6
+.???#?..?????? 1,2,1,4
+.#..???.??##??. 1,3,3,1
+????#??????#???????? 1,1,5,2,1,1
+?.?###?#?#?#?#?#?.?? 14,1
+?.?.?#??????? 1,3,2,1
+?##????????#?#??.# 5,1,3,1,1,1
+???.???#????? 1,6
+?????####?????#?#? 1,11,3
+?#?.???#??? 1,2,1
+..#??##??? 6,1
+??????.??.. 2,3,1
+.????#?.#???.?? 1,2,1,1,1
+.??##?##??..??###??? 7,5
+#???#??.??.?#.#.?. 1,2,2,1,1,1
+??????#?#??.?? 5,1,2
+#?#??#??????.????.?? 9,1,1,1,1
+#?#..????#?????###? 1,1,1,4,7
+.?.?????#.?# 1,1,2,1
+?.???#?##?????#????? 5,2
+#?????.??? 2,1,2
+?????#??#?#????#?? 13,1
+?.??#????#..?? 5,2,1
+????#??##?.?.? 1,3,3,1
+?.????.?##???#? 2,7
+#?#?????#??.??##?? 6,1,1,1,2
+???#?#??????#???.?.? 4,4,1,1,1
+???#???#?#?.#? 4,5,1
+??.?#???????????. 1,5,4
+.?#.?????#.? 2,2,1,1
+????.?#?###???#?.#.? 2,11,1
+??#??????##?#?? 2,9
+???????#?#?##??????? 3,1,7,1,1
+???##?....??????? 6,6
+?#.?#?.##?#?#. 1,1,2,3
+??????????#? 4,2
+#.?###?#???#?##?#?.? 1,13,1,1
+??#?#?.?.???.??##?? 6,3,4
+???.#?????##?.# 1,1,8,1
+??????#?#?? 8,1
+?#??????#??#?. 6,1,1
+.#?#??#.#?#?#?.? 6,5,1
+?????????#??.??#?#? 7,2,3
+.????#??#????.??#? 8,1,3
+??.?#???##?#??##??? 2,12,1
+?#???###?.???.?? 7,3,2
+#????.#???.???#..# 1,1,1,1,4,1
+????##?.#? 6,2
+??????####?.# 7,1
+????#??.#. 1,4,1
+.????#?????????##?? 15,1
+???.????#?# 1,4
+???????###. 1,5
+#?.?????#??#?? 2,6
+?????##????.#??#.?? 8,2,1
+??####????##???.# 13,1
+?..??#??#.?#?????? 1,3,1,1,1,1
+.#???#???????#??#?? 6,1,8
+??#?#..???? 4,2
+.?#?.?.???? 2,1
+.???????????? 2,1
+????????#?.??? 1,1
+??#???#???. 2,4,1
+#??.????#.?. 3,3,1,1
+?????#.?.?.????. 5,2
+???#???.???? 1,5,1,1
+#.?.?????#????? 1,6,1,1
+?#?..#?#.??.??#?. 2,3,3
+#????..???. 5,1,1
+?#??#?????#???#. 1,3,1,1,3
+???#?????????????.?? 4,2,1,5,2
+????...?..??.????? 2,1
+??.?..?####?#?#????# 1,14
+???###?##??#?# 9,1,1
+??.#??.???##? 1,3,5
+??#??#???????? 1,2,1,2
+?.###??##??.?#.. 9,1
+?????#???? 1,1
+#??????#?#???.?##?. 1,8,3
+.?.??###?# 1,7
+?????????##???.???# 1,2,1,4,2
+?.?#???#???#.???? 2,1,2,2,1
+#????#??????.?? 4,3,1,1,1
+??????????.? 3,3,1
+?????.??#?## 2,4
+?###?#??.????..? 8,2,1
+?????.##???.?? 3,4,1
+#??????.??# 1,3,2
+?#?????????#?.?? 7,3
+????#??#?.??????. 5,1,5
+.?#?#??#?.???### 8,1,3
+??.?#???.???????.? 2,4,1,5,1
+??.??#????.#?#???? 1,1,2,1,1,3
+????????.???# 1,1,1,2
+???#??#?#??.????#. 5,2,5
+??.??.?#?.#?#? 2,2,1,4
+.#????.#???????.?? 1,1,1,5
+???###??????????.?? 15,1
+???????##.??.??# 6,2,1,1,1
+???????.??? 6,2
+????????.?#?#.??#??. 3,3,3,4
+????#?..?.. 3,1
+?#??#?###???##?#?? 2,13
+????###??? 2,4,1
+??.?#??####?.??##??? 9,6
+?#???..???.????? 4,2,1,2
+??#??##???? 3,2
+?#??#?##?????# 1,2,6,1
+..????..???? 4,1,2
+?#????.???..#???? 2,2,2,2,2
+?#????????#??#??? 1,13
+#???..#???????# 1,1,1,7
+#?#.#????.?? 3,1,1,1
+?.???????..?.?? 1,4
+?.#??.????? 1,1,1
+??#?.?????#. 3,3,2
+.?.#??##?##???#? 1,12
+??#????#??.#? 8,1
+??#???..####?#??#? 5,7,2
+???.#?#?????#?????? 1,6,2,2
+??.???????#??##?#.. 1,2,4,4
+#.??????????#???? 1,1,11
+???#?#???#???. 1,4,2,2
+?????.????? 1,1,4
+??????#??##??. 9,1
+??#???#?.??? 6,1
+????.???##?.??.#??? 2,5,1,2,1
+??.#?.?..?#????.?? 1,3
+?#?#.??#.? 3,1
+##??#?.#?????#?????? 3,1,3,1,1,4
+????.?#???#??#?? 1,1,5,2,1
+?????..?????? 4,5
+??#..?#.?.????????#? 1,2,6,1
+?#??#?##???#???#???. 2,8,1,1
+????#????#.????.#? 1,5,1,1,1,1
+?????????# 1,1,2
+??#???##??. 3,4
+?#?????#???#?? 1,1,6
+??#??.#?#???#?????? 2,1,5,3
+??????????#???#. 2,6,1
+?????#?#??????#????? 11,1,1,1
+?????#.?.?...??.?# 1,3,1,1,1,1
+??#.#???#???????? 1,1,10,1
+???#?.????.??#??# 1,3,1,1,6
+#??????#.??#?.? 2,1,1,1,2
+?.???????.??? 5,1
+???#...?#?? 1,1,2
+????.?????????.? 1,8
+?##?#?##?#???###??? 3,14
+??????#???#?#?#???#? 1,16
+?.?????????????? 1,2,1,4,1
+?..?.?#??##?..?????? 1,1,6,2,1
+.?###?#?.??# 7,2
+???#.#????.???? 1,2,3,1,3
+?#.????#????? 2,1,5,1
+#.##?????.#..??#???? 1,2,2,1,5
+??#?##????.#???.?.?? 3,2,1,4,1,1
+?.??#.?????#?#.. 3,6
+????##??#??? 1,1,7
+??.#?##??.? 1,6,1
+??.???#?.??##????? 1,1,6,1
+?#??.????###??.? 2,9
+?????#??#???#.??. 1,7,1,1
+?????????#? 2,3,1
+#?????????.???? 8,4
+??.#?.#?.?? 2,1,1
+.????##?????#?#? 6,4
+#??????.?#????? 1,2,6
+?#???????. 3,4
+???.???##???.??#? 1,8,2
+.#???#??#????#??? 1,13
+?.?????#????? 1,2,1,4
+??.??????? 1,3
+.????#??#?????# 8,1,1
+.??#???#????????? 3,4,3
+#?????#???#?#?.????? 7,4,1,1
+???#.?.#??.??????? 4,1,1,1,4
+???????#?? 3,3
+??#???#???? 3,6
+?????#????.?? 5,1,1
+.???#?#..##.? 2,3,2,1
+?#?.?????#?#?? 2,1,5
+#.????.?????? 1,4,2,1
+???#???..?#??#???. 6,6
+#???.#?#?????#?? 4,10
+#????????? 2,1,3
+?#??#?#.?#?#???# 1,1,1,4,2
+???????##?#?? 2,7
+..??#?????.?#??? 5,3
+..????????.???.? 1,1,2,1
+?.??#????#?? 4,1
+???.??.????.??. 1,2
+.?????????###.?#?? 5,1,3,1
+???.?#????#????? 1,8,1
+??.??.???.??? 2,1,3,1
+?.??###???????.. 4,3
+????????????.#??? 3,3,1,2
+???#?.#?###??#??? 1,3,5,1,2
+?#??#???..??#?.. 7,4
+#.??##?????. 1,1,4,1
+?.??.#????#?#??#? 1,1,12
+????#??#?.? 7,1
+????#??.?? 2,3
+?..??#?.????# 3,1,2
+?.#?#???#???.#? 1,5,3,1
+##??#?#???###?? 2,11
+???#####??????? 2,10
+??#?#?#?.?. 6,1
+????..????..#?#. 1,1,3,1,1
+.#?????#???##?#??? 14,1
+#.??.?.??#.?.?? 1,2,3,1,1
+?#??????.????.???.? 3,1,1,2,3,1
+?.?.???#?? 1,1,2
+??#?##????? 4,1
+?.?#??.??. 2,1
+??.???#.?? 1,1
+##.?.?#?????.#? 2,5,1
+?##?#.???????. 5,1,4
+..?##???#.???? 6,2
+.???.??????#?#?. 1,7
+?????#.??#? 2,1,2
+.#?.#?????????? 1,1,1,5,1
+???.?????##??..? 2,1,1,4,1
+?????##..? 5,1
+#?????????#???? 1,3,1,3,1
+?#????..???????##? 1,1,10
+???#????#.??.????#? 1,2,1,1,2,6
+??##.?.???.??..#? 3,3,1,2
+?.?#?#?.???#?#??? 4,4
+?##???.??#?.? 2,1,1
+#?.??##??.?.#?????? 1,6,1,1,1
+???#??#???.?##?? 7,3
+?##??.?.?#????????#? 3,2,1,1
+?..?#?.##?#?.? 2,5
+?..??????? 1,2,2
+??#?????.#???#??. 4,7
+????.?????.. 2,4
+.??#?.??.??..??????# 3,1,1,4,1
+#???#?###??##?.? 1,11
+??#??.???????#??#? 5,10
+?.??#?..##?. 1,3,3
+??.???.?.? 2,2
+#??????##?##.?? 4,6,1
+???????.?#????.?? 2,1,2,3,1
+.??#???#???#?##.#.?? 13,1
+??.??#?#?? 1,5,1
+?#?#?#.?????.?? 2,3,2,2,1
+????.???#????#? 1,1,2,4
+.?????.????#. 2,1,1,1
+.???.????.?? 1,1,1,1
+?.????.?#.??#. 4,2,2
+??????.?.???#?? 1,1,5
+????????.?#???#?? 5,5
+????####??##?? 7,5
+.??##??????.???.? 10,1
+#??#???#??#??? 1,3,4,1
+.#???.????? 2,3
+..??#??#??#??#?? 2,8
+??????##??.???? 2,1,4,1
+??????##??????????? 1,5,5,1,1
+??#?.??????.?????? 3,1,1,1,1,2
+???#.?#??? 2,2
+##.??????#????# 2,2,8
+?#????????? 5,3
+?#?..????.?# 2,1,2
+#??.?.#???#????# 1,1,1,3,1
+?..??.??????? 1,1,1,2
+?#?.?######?#???? 2,7,1,1
+??##???.?###? 5,3
+??#.??##..???????? 2,4,4
+??????.#.??##?. 2,1,5
+????#?.??? 1,2,1
+.???????.?.? 2,2,1
+?????#???????? 2,3,2,1
+?.??.#?#?# 1,5
+??.???.?????.?? 1,2,1,1,1
+???.?..??? 1,1,2
+????.?.??.? 1,2
+?.????#??? 2,3
+?????#???????.?? 7,2,1,1
+???????.?## 1,4,3
+?.?#?????? 4,1
+??????#????#..?????? 11,3,1
+#?##????##???##.? 4,1,7,1
+?#???##??????##?#? 2,3,1,4,1
+??..#?????#??.?? 1,9
+?###.????.???#???? 3,2,1,6
+???#????.????##??. 3,1,4
+????#???.?##?. 1,1,2
+.???#??##?#?# 1,6
+#??.?????.?.? 3,4
+?.??#?#?#????? 8,1
+?????.????? 1,1,2
+?.#???#????????#.#? 1,8,4,2
+???#???#??#??????#.? 6,1,2,2,2
+????.???.??????#? 2,1,7
+??#.?????.?. 1,2,1,1
+?#?##???.?#???????# 1,5,1,2,1,1
+??????#?#.??? 3,3
+??##??????..#??. 7,2
+????.?.??.? 1,1
+?????#??#? 2,1,2
+???#?.???????# 4,1,3
+??##????#?#?? 5,1,1,1
+??##?.#?.#????????. 1,2,1,1,1,4
+?.??.???.#. 2,1,1
+???#??#?????###???.. 9,6
+???????.???#.?# 1,2,3,2
+???#?.####??????. 1,3,6,1,1
+#?#??#?????###?#. 1,8,3,1
+???#?????? 1,3,2
+#?#??????#??#?.?? 13,2
+.?????#.??#? 1,1,1,2
+.###..?.???#??.?? 3,1,6,1
+#??#???#?..?????###? 1,6,3,3
+.??????#???. 1,3,1,2
+#????#??.??????#?? 1,1,1,1,1,5
+?????.??#??#???#?? 4,11
+????#???#??????? 6,1
+.??##?.?..?.#??#. 4,1,1,1,1
+???#?????#??? 2,5
+#?????.?????.?#? 3,1,5,3
+??.#??#?#.? 2,1,1
+?#.?????????.?. 1,7,1
+###???#?????#????#.. 13,1,1
+..???????.?.#.?? 1,4,1,1,1
+??.#?#????????? 3,1
+.????????.??#?#??? 5,7
+?#.????????#???.? 1,2,1,4,1
+?#.??##????#??#####? 1,6,8
+???.?#?#???#?#. 2,5,3
+##..?#????.# 2,6,1
+#??#.#???##.. 1,1,1,4
+.?.?##?????.?? 3,1
+.#..#.??#??#?##?##.. 1,1,11
+.?.?????##???#?. 1,7,3
+?#???#????#???# 2,3,2,1
+?##?#????.?# 7,1
+?..??#?????? 1,1,1,4
+..#?.?#?.???#???#? 1,2,4,3
+????????.????? 3,2,4
+???.???#?.?...# 1,1,2,1
+#??###???#??? 6,2
+?.?.?.?.#.?? 1,1,1,1
+.?##?#??.??#???##?. 5,7
+??.?????#?????? 2,9,1
+.?#..?##??..#??# 2,4,4
+????.??????#?????? 1,9,2
+.????.##???? 1,2,4
+.???.??.#?? 2,1,2
+..???#???? 1,3
+.??#???..?? 2,2,1
+?#?#?????????.???? 13,2
+???.??#??... 2,3
+???.?#????#??. 1,6
+?.??##??##????? 8,1
+?.??#?###??#.?#?? 9,1
+??###.?????#????##? 1,3,8,2
+?????#??#.#.???###? 1,5,1,7
+?...?#????. 2,2
+????.??#?.???? 2,3,2
+??.?????#.. 2,3
+#??#??????.. 2,2,2,1
\ No newline at end of file
diff --git a/day-12/part-1/vanyle.nim b/day-12/part-1/vanyle.nim
new file mode 100644
index 0000000..e52344e
--- /dev/null
+++ b/day-12/part-1/vanyle.nim
@@ -0,0 +1,116 @@
+from times import cpuTime
+from os import paramStr
+
+import tables, strutils, sequtils, sugar, hashes
+
+func parseInput(s: string): seq[(string, seq[uint8])] = 
+    let lines = s.strip.splitLines
+    for i in lines:
+        var s = i.split(" ",2)
+
+        result.add((
+            s[0],
+            s[1].split(",").map(x => x.parseInt().uint8)
+        ))
+
+
+type LinkedString = object
+    c: char
+    h: Hash
+    n: int32 # index to next element.
+
+var memory: seq[LinkedString]
+
+proc addAtEnd(ll: int32, c: char): int32 =
+    var lh = hashes.hash(0)
+    if ll != -1:
+        lh = memory[ll].h
+
+    var ls = LinkedString(
+        c: c,
+        n: ll,
+        h: lh !& hash(c)
+    )
+    memory.add(ls)
+    return memory.len.int32 - 1
+
+proc toLinkedString(s: string): int32 =
+    var current = -1.int32
+    for i in s:
+        current = current.addAtEnd(i)
+    return current
+
+proc hash(ll: int): Hash =
+    if ll == -1: return hash(0)
+    return memory[ll].h
+
+var hints: seq[uint8]
+var memoTable: Table[(int32, uint8, uint8), int]
+proc possibilities(pattern: int32, hintSlice: uint8, counterSeq: uint8): int =
+    # Recursion, my boy!!
+    if (pattern, hintSlice, counterSeq) in memoTable:
+        return memoTable[(pattern, hintSlice, counterSeq)]
+
+    if pattern == -1:  
+        if hintSlice > 1:
+            return 0
+        if hintSlice == 0 and counterSeq == 0:
+            return 1
+        if hintSlice == 1 and counterSeq == hints[0]:
+            return 1
+        return 0
+
+    var brokenCounter = counterSeq
+    var pp = pattern
+
+    while pp != -1:
+        var el = memory[pp]
+        if el.c == '#':
+            inc brokenCounter
+        elif el.c == '.':
+            if brokenCounter == 0:
+                pp = el.n
+                continue
+            if hintSlice == 0:
+                return 0
+            if hints[hintSlice-1] == brokenCounter: # ok!
+                var r = possibilities(el.n, hintSlice - 1, 0)
+                memoTable[(pattern, hintSlice, counterSeq)] = r
+                return r
+            else:
+                return 0 # impossible!
+        elif el.c == '?':
+            var p1 = el.n.addAtEnd('.')
+            var c1 = possibilities(p1, hintSlice, brokenCounter)
+            
+            var p2 = el.n.addAtEnd('#')
+            var c2 = possibilities(p2, hintSlice, brokenCounter)
+            
+            memoTable[(pattern, hintSlice, counterSeq)] = c1 + c2
+            return c1 + c2
+        pp = el.n
+
+    # make sure the counter and the hint match here.
+    return possibilities(-1, hintSlice, brokenCounter)
+
+proc run(s: string): string =
+    var r = parseInput(s)
+    var res = 0
+    memory = newSeqOfCap[LinkedString](3000)
+    
+    for i in r:
+        hints = i[1]
+        memoTable.clear()
+        memory.setLen(0)
+        var p = possibilities(i[0].toLinkedString(), i[1].len.uint8, 0)
+        res += p
+    return $res
+
+
+var input: string = paramStr(1)
+
+var t0 = cpuTime()
+var output = run(input)
+
+echo "_duration:", (cpuTime() - t0) * 1000
+echo output
diff --git a/day-12/part-2/vanyle.nim b/day-12/part-2/vanyle.nim
new file mode 100644
index 0000000..cca538d
--- /dev/null
+++ b/day-12/part-2/vanyle.nim
@@ -0,0 +1,91 @@
+from times import cpuTime
+from os import paramStr
+
+import tables, strutils, sequtils, sugar, hashes
+
+func parseInput(s: string): seq[(string, seq[uint8])] = 
+    let lines = s.strip.splitLines
+    for i in lines:
+        var s = i.split(" ",2)
+
+        result.add((
+            s[0],
+            s[1].split(",").map(x => x.parseInt().uint8)
+        ))
+
+
+var hints: seq[uint8]
+var memoTable: Table[(string, int16, uint8, uint8), int]
+proc possibilities(pattern: string, pslice: int16, hintSlice: uint8, counterSeq: uint8): int =
+    # Recursion, my boy!!
+    if (pattern, pslice, hintSlice, counterSeq) in memoTable:
+        return memoTable[(pattern, pslice, hintSlice, counterSeq)]
+
+    if pslice == -1:  
+        if hintSlice > 1:
+            return 0
+        if hintSlice == 0 and counterSeq == 0:
+            return 1
+        if hintSlice == 1 and counterSeq == hints[0]:
+            return 1
+        return 0
+
+    var brokenCounter = counterSeq
+
+    for j in countdown(pslice, 0):
+        if pattern[j] == '#':
+            inc brokenCounter
+        elif pattern[j] == '.':
+            if brokenCounter == 0: continue
+            if hintSlice == 0: return 0
+            if hints[hintSlice-1] == brokenCounter: # ok!
+                var r = possibilities(pattern, j-1, hintSlice - 1, 0)
+                memoTable[(pattern, pslice, hintSlice, counterSeq)] = r
+                return r
+            else:
+                return 0 # impossible!
+        elif pattern[j] == '?':
+            var p1 = pattern[0..<j] & '.'
+            var c1 = possibilities(p1, j, hintSlice, brokenCounter)
+            
+            p1[j] = '#'
+            var c2 = possibilities(p1, j, hintSlice, brokenCounter)
+            
+            memoTable[(pattern, pslice, hintSlice, counterSeq)] = c1 + c2
+            return c1 + c2
+
+    # make sure the counter and the hint match here.
+    return possibilities(pattern, -1, hintSlice, brokenCounter)
+
+proc duplicate(pattern: string, hints: seq[uint8]): (string, seq[uint8]) =
+    var patfive = ""
+    var hintfive: seq[uint8] = @[]
+    for i in 0..<5:
+        patfive &= pattern
+        if i != 4:
+            patfive.add "?"
+        hintfive = hintfive.concat(hints)
+
+    return (patfive, hintfive)
+
+proc run(s: string): string =
+    var r = parseInput(s)
+    var res = 0
+
+    for i in r:
+        var j = duplicate(i[0], i[1])
+        hints = j[1]
+        memoTable.clear()
+        var p = possibilities(j[0], (j[0].len-1).int16, j[1].len.uint8, 0)
+        res += p
+
+    return $res
+
+
+var input: string = paramStr(1)
+
+var t0 = cpuTime()
+var output = run(input)
+
+echo "_duration:", (cpuTime() - t0) * 1000
+echo output
diff --git a/day-13/input/vanyle.txt b/day-13/input/vanyle.txt
new file mode 100644
index 0000000..b2875ec
--- /dev/null
+++ b/day-13/input/vanyle.txt
@@ -0,0 +1,1351 @@
+...##.#
+.##.###
+.##.###
+...##.#
+#...###
+.#..##.
+##.##.#
+...####
+#.#.###
+#....#.
+..#.##.
+..#.##.
+#....#.
+#.#.#.#
+...####
+
+###..##.######.##
+..#..#.#......#.#
+#.##.#..#.##.#..#
+#.#.##.#..##..#.#
+#..#...###..###..
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+#.##.#..#.##.#..#
+..#..#.#......#.#
+###..##.######.##
+...#.#..######..#
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diff --git a/day-13/part-1/vanyle.nim b/day-13/part-1/vanyle.nim
new file mode 100644
index 0000000..2b5dfad
--- /dev/null
+++ b/day-13/part-1/vanyle.nim
@@ -0,0 +1,66 @@
+from times import cpuTime
+from os import paramStr
+
+import strutils, sugar, sequtils
+
+proc parseInput(s: string): seq[seq[string]] = 
+    return s.strip.split("\n\n").map(x => x.split("\n"))
+
+proc isHorizontalSym(pattern: seq[string], l: int): int =
+    var errCount = 0
+    for i in (l+1)..<min(pattern.len,2*l+2):
+        var match = 2 * l + 1 - i
+        # i: l+1 --> pattern.len : OK
+        # match: 0 --> l: OK (and they are disjointed!)
+
+        for j in 0..<pattern[0].len:
+            if pattern[i][j] != pattern[match][j]:
+                inc errCount
+                if errCount >= 2:
+                    return errCount
+    return errCount
+
+proc isVerticalSym(pattern: seq[string], l: int): int =
+    var errCount = 0
+    for i in (l+1)..<min(pattern[0].len,2*l+2):
+        var match = 2 * l + 1 - i
+
+        for j in 0..<pattern.len:
+            if pattern[j][i] != pattern[j][match]:
+                inc errCount
+                if errCount >= 2:
+                    return errCount
+    return errCount
+
+proc findSymetry(pattern: seq[string]): (bool, int) =
+    for l in 0..<(pattern.len-1):
+        if pattern.isHorizontalSym(l) == 0:
+            return (false, l)
+
+    for l in 0..<(pattern[0].len-1):
+        if pattern.isVerticalSym(l) == 0:
+            return (true, l)
+
+    return (false, -1)
+
+proc run(s: string): string =
+    var r = parseInput(s)
+    var res = 0
+
+    for pattern in r:
+        var (symDir, symPos) = findSymetry(pattern)
+        if symDir: # vertical
+            res += (symPos+1)
+        else:
+            res += 100 * (symPos+1)
+
+    return $res
+
+
+var input: string = paramStr(1)
+
+var t0 = cpuTime()
+var output = run(input)
+
+echo "_duration:", (cpuTime() - t0) * 1000
+echo output
diff --git a/day-13/part-2/vanyle.nim b/day-13/part-2/vanyle.nim
new file mode 100644
index 0000000..f4e398b
--- /dev/null
+++ b/day-13/part-2/vanyle.nim
@@ -0,0 +1,93 @@
+from times import cpuTime
+from os import paramStr
+
+import strutils, sugar, sequtils
+
+proc parseInput(s: string): seq[seq[string]] = 
+    return s.strip.split("\n\n").map(x => x.split("\n"))
+
+proc isHorizontalSym(pattern: seq[string], l: int): int =
+    var errCount = 0
+    for i in (l+1)..<min(pattern.len,2*l+2):
+        var match = 2 * l + 1 - i
+        # i: l+1 --> pattern.len : OK
+        # match: 0 --> l: OK (and they are disjointed!)
+
+        for j in 0..<pattern[0].len:
+            if pattern[i][j] != pattern[match][j]:
+                inc errCount
+                if errCount >= 2:
+                    return errCount
+    return errCount
+
+proc isVerticalSym(pattern: seq[string], l: int): int =
+    var errCount = 0
+    for i in (l+1)..<min(pattern[0].len,2*l+2):
+        var match = 2 * l + 1 - i
+
+        for j in 0..<pattern.len:
+            if pattern[j][i] != pattern[j][match]:
+                inc errCount
+                if errCount >= 2:
+                    return errCount
+    return errCount
+
+proc toggle(c: char): char =
+    if c == '.':
+        return '#'
+    else:
+        return '.'
+
+proc run(s: string): string =
+    var r = parseInput(s)
+
+    var res = 0
+
+    for idx in 0..<r.len:
+        # var pattern = r[idx]
+        # By changing 1 position in pattern,
+        # symData can change ...
+
+        var symetryCandidates: seq[(bool,int)] = @[]
+        for l in 0..<(r[idx].len-1):
+            if r[idx].isHorizontalSym(l) == 1:
+                symetryCandidates.add (false, l)
+
+        for l in 0..<(r[idx][0].len-1):
+            if r[idx].isVerticalSym(l) == 1:
+                symetryCandidates.add (true, l)
+
+        var newSymData = (false, -1)
+
+        block inner:
+            for i in 0..<r[idx].len:
+                for j in 0..<r[idx][0].len:
+                    r[idx][i][j] = toggle(r[idx][i][j])
+
+                    for (scType, scPos) in symetryCandidates:
+                        if scType and r[idx].isVerticalSym(scPos) == 0:
+                            newSymData = (scType, scPos)
+                            break inner
+                        elif not scType and r[idx].isHorizontalSym(scPos) == 0:
+                            newSymData = (scType, scPos)
+                            break inner
+
+                    r[idx][i][j] = toggle(r[idx][i][j])  
+
+        var (symDir, symPos) = newSymData
+
+        if symDir: # vertical
+            res += (symPos+1)
+        else:
+            res += 100 * (symPos+1)                    
+
+    return $res
+
+
+var input: string = paramStr(1)
+
+var t0 = cpuTime()
+var output = run(input)
+
+echo "_duration:", (cpuTime() - t0) * 1000
+echo output
diff --git a/day-14/input/vanyle.txt b/day-14/input/vanyle.txt
new file mode 100644
index 0000000..0320971
--- /dev/null
+++ b/day-14/input/vanyle.txt
@@ -0,0 +1,100 @@
+#..#.#.O...OO....##O....#....O.O#.......O.O.#.O..#..........O...#OO.O..OO..#.#..O.O.OO...#.OOO...OO.
+..O..O#OO#....#.#O.#......#...O...O..O##.....O..........OOO.#......#OOO....#.#..O..O......OO....O.OO
+O..#O..#O#...O#....O#.O...#.#..##O.O#OOO..OOOOOO.O.#O.O....O......OO#O#..O.........O.#....O..O......
+O.O.....#O##..OO.........#.........O.#...#..#...OO##......O.....O..OO#.#.##..OO.........O#.#....#.#.
+......#....#OOOO..O#O...#...O#....O#..#..OO##..###.#.O#.O...#O.#..........O..##....O#O....OO.....O##
+..##.#O...#......#.O...O.#O.O....#....#..##.........#.O#O.O.#.####..O#.O#......O...#.#.#O..#O...OO#.
+.OO.O....O#.O..O.......O.OO#O....#..O.#....OO##..O.O....O...O.#....#......O....#.O..OO....OO..#....#
+..OOO......#..#.....#.O.........O....OO..##.OO##...#.#.O#.#......#....###...#..#...##....#..O#...O..
+O#.O.O#.O......#..O..O.OO##...O.....O...##...O.OO.O..##....#.O......O#.....O.OO.O..O.........#..#..O
+.##..#.....#....#...O.O#O#...##O....O..O.#O#.#OO.#..O#..O..#O###...........#.##O.###O...O.#....O#..O
+.#.#.#O...OO....O.###........OOO...#.#.O.....O.....#..#....#...O....O.#O...O.O.#.#...#O#O#O.#O.O...O
+.#......O.O.#..O#..#......#.....O...#.O.....O.......#.......#..O...#.#.#.##.#.#...O...........###O.#
+#..O..#....##O##..#.#.OO..O#O........O#..##O....#OOO..O.#.#.#..##.OO.#..O.#...O..O.O......#..O......
+O#O.#...O...O....#....O..O#...O#..#O.....#..#....#.O.O##.#.O.O#O#......#.##..O.O#.O.....O...O#O..OO#
+.OO#.....O....O.##...#.......#O#..OO.OO#.#..O.#.O.O..O.#.O.O..OO.O...OOO...#O..........#..#.O.O#...O
+O..O.#......#.O.O....#..O.....O...#....O..##.#.###....#.#...#O....O........O...O...OO...##..O.OO#..#
+.O.O.####.#.O....O#..O.O#.##.OO..#.....O......OO..#.O.O...#..#....#..O..O..O#O......#O.OO...##O...O.
+.O.....O.........#...O..O..O.O#..##.#...O#.......O.##O.....#.#.#..O..O...#.OO#.#.O..#...O..O.O......
+......O.O...O......O#.O.#OO.....#..#..........O..OOO...O...#.#..O#....O.#.O..O.#O..O..#.#..#.O..#...
+##.#.#O...O.#O..O..#.OO..###.......O....OO......#...O...O.#...O..O.#...#...O.O#..##O#..#...O.#....OO
+.OO#..#.#.#O..O.O..O#....#.O......###.O.O.O.#.......##...O##OO#.....##..O#.#..#.#.O.#.#...O..O.#...#
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diff --git a/day-14/part-1/vanyle.nim b/day-14/part-1/vanyle.nim
new file mode 100644
index 0000000..14cdebe
--- /dev/null
+++ b/day-14/part-1/vanyle.nim
@@ -0,0 +1,38 @@
+from times import cpuTime
+from os import paramStr
+
+import strutils
+
+proc parseInput(s: string): seq[string] = 
+    return s.strip.split("\n")
+
+proc tiltNorth(s: var seq[string]) =
+    for i in 1..<s.len:
+        for j in 0..<s[i].len:
+            var pi = i
+            if s[pi][j] == 'O':
+                while pi-1 >= 0 and s[pi-1][j] == '.':
+                    s[pi-1][j] = 'O'
+                    s[pi][j] = '.'
+                    dec pi
+
+proc run(s: string): string =
+    var r = parseInput(s)
+    r.tiltNorth()
+
+    var res = 0
+    for i in 0..<r.len:
+        for j in 0..<r[i].len:
+            if r[i][j] == 'O':
+                res += r.len - i
+
+    return $res
+
+
+var input: string = paramStr(1)
+
+var t0 = cpuTime()
+var output = run(input)
+
+echo "_duration:", (cpuTime() - t0) * 1000
+echo output
diff --git a/day-14/part-2/vanyle.nim b/day-14/part-2/vanyle.nim
new file mode 100644
index 0000000..93db10a
--- /dev/null
+++ b/day-14/part-2/vanyle.nim
@@ -0,0 +1,98 @@
+from times import cpuTime
+from os import paramStr
+
+import strutils, tables
+
+proc parseInput(s: string): seq[string] = 
+    return s.strip.split("\n")
+
+proc tiltNorth(s: var seq[string]) =
+    for i in 1..<s.len:
+        for j in 0..<s[i].len:
+            var pi = i
+            if s[pi][j] == 'O':
+                while pi-1 >= 0 and s[pi-1][j] == '.':
+                    s[pi-1][j] = 'O'
+                    s[pi][j] = '.'
+                    dec pi
+
+proc tiltWest(s: var seq[string]) =
+    for i in 0..<s.len:
+        for j in 1..<s[i].len:
+            var pj = j
+            if s[i][j] == 'O':
+                while pj-1 >= 0 and s[i][pj-1] == '.':
+                    s[i][pj-1] = 'O'
+                    s[i][pj] = '.'
+                    dec pj
+
+proc tiltSouth(s: var seq[string]) =
+    for i in countdown(s.len-2, 0):
+        for j in 0..<s[i].len:
+            var pi = i
+            if s[i][j] == 'O':
+                while pi+1 < s.len and s[pi+1][j] == '.':
+                    s[pi+1][j] = 'O'
+                    s[pi][j] = '.'
+                    inc pi
+
+proc tiltEast(s: var seq[string]) =
+    let wi = s[0].len
+    for i in 0..<s.len:
+        for j in countdown(s[0].len-2, 0):
+            var pj = j
+            if s[i][j] == 'O':
+                while pj < wi and s[i][pj+1] == '.':
+                    s[i][pj+1] = 'O'
+                    s[i][pj] = '.'
+                    inc pj
+
+var cycleFinder: Table[seq[string], int]
+var callCounter = 0
+proc cycle(s: var seq[string]): int =
+    if s in cycleFinder:
+        result = callCounter - cycleFinder[s]
+    else:
+        result = -1
+    cycleFinder[s] = callCounter
+
+    s.tiltNorth()
+    s.tiltWest()
+    s.tiltSouth()
+    s.tiltEast()
+    
+    inc callCounter
+
+proc run(s: string): string =
+    var r = parseInput(s)
+    var cycleLength = 0
+
+    for _ in 0..<1000000000:
+        var c = cycle(r)
+        if c != -1:
+            cycleLength = c
+            break
+
+    var remaining = 1000000000 - callCounter
+    # how many transformation are left to apply?
+    var toApply = remaining mod cycleLength
+
+    for _ in 0..<toApply:
+        discard cycle(r)
+
+    var res = 0
+    for i in 0..<r.len:
+        for j in 0..<r[i].len:
+            if r[i][j] == 'O':
+                res += r.len - i
+
+    return $res
+
+
+var input: string = paramStr(1)
+
+var t0 = cpuTime()
+var output = run(input)
+
+echo "_duration:", (cpuTime() - t0) * 1000
+echo output
diff --git a/day-15/input/vanyle.txt b/day-15/input/vanyle.txt
new file mode 100644
index 0000000..9a00a61
--- /dev/null
+++ b/day-15/input/vanyle.txt
@@ -0,0 +1 @@
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\ No newline at end of file
diff --git a/day-15/part-1/vanyle.nim b/day-15/part-1/vanyle.nim
new file mode 100644
index 0000000..b656993
--- /dev/null
+++ b/day-15/part-1/vanyle.nim
@@ -0,0 +1,26 @@
+from times import cpuTime
+from os import paramStr
+
+proc run(s: string): string =
+    var res = 0
+    var h = 0
+    for c in s:
+        if c == ',':
+            res += h
+            h = 0
+        else:
+            var ascii = cast[int](c)
+            h += ascii
+            h = h * 17
+            h = h mod 256
+    res += h
+    return $res
+
+
+var input: string = paramStr(1)
+
+var t0 = cpuTime()
+var output = run(input)
+
+echo "_duration:", (cpuTime() - t0) * 1000
+echo output
diff --git a/day-15/part-2/vanyle.nim b/day-15/part-2/vanyle.nim
new file mode 100644
index 0000000..9b19b79
--- /dev/null
+++ b/day-15/part-2/vanyle.nim
@@ -0,0 +1,56 @@
+from times import cpuTime
+from os import paramStr
+
+import tables, ../../lib/nim/vanyle/speed_utils
+
+proc parseUnsignedInt*(s: openarray[char]): int =
+    var i = 0
+    while i < s.len and isDigit(s[i]):
+        result *= 10
+        result += toDigit(s[i])
+        inc i
+
+proc hashS(s: openarray[char]): int =
+    var h = 0
+    for j in 0..<s.len:
+        var ascii = cast[int](s[j])
+        h += ascii
+        h = h * 17
+        h = h mod 256
+    return h
+
+proc run(s: string): string =
+    var boxes: array[256, OrderedTable[string, int]]
+
+    for ll in s.fastSplit(','):
+        var i = 0
+        while ll[i] != '-' and ll[i] != '=':
+            inc i
+
+        var label = ll.toOpenArray(0, i-1).toString()
+        var boxId = hashS(label)
+
+        if ll[i] == '=':
+            var focLength = parseUnsignedInt(ll.toOpenArray(i+1, ll.len-1))
+            boxes[boxId][label] = focLength
+        elif ll[i] == '-':
+            boxes[boxId].del(label)
+
+    var res = 0
+    for b in 0..<256:
+        var i = 1
+        for k,v in boxes[b]:
+            var power = (b+1) * i * v
+            res += power
+            inc i
+
+    return $res
+
+
+var input: string = paramStr(1)
+
+var t0 = cpuTime()
+var output = run(input)
+
+echo "_duration:", (cpuTime() - t0) * 1000
+echo output
diff --git a/day-16/input/vanyle.txt b/day-16/input/vanyle.txt
new file mode 100644
index 0000000..beb93fc
--- /dev/null
+++ b/day-16/input/vanyle.txt
@@ -0,0 +1,110 @@
+\.........|......./...|........................................................|............|-...\...-/.......
+.....................\.......\........./...|...............|...\................................-...|.......\.
+.......................................-....-./............/.......-.............\..|.......|......//.........
+...../..../.....\.........-.........-./..-.......\./..\.............-.....\..........|-..................|....
+...........\..\...............-.............|.......-.\......\...\..........\.......-.....|..................\
+................|.........|........|............--........./\....|-.....................................-.....
+........./...........\................../...................\././........./...-...-.\.-.........-.............
+......|.....|............-............./...|...................-...|........./............/......./...........
+......./........../..|.....-...........\|.................................................\.........|..../....
+........................|..................|.......|.................-..\...........-/.\.................\.|..
+.......|...|./....................................-...\........\.......|............................|...|.....
+\..-................................\.......\........../....|.....................|........\../.........../..\
+....-|...............................\....|..............\.....................|.....\......\............../..
+.....\......-.........-.\.|..........|...............-.................|..........-............../............
+.........-...................-.............................................-.........../...................|.-
+....................\..\........|-.\...............-............/....|..................../...................
+.\.........-........................|..-.......|.......-...........-.-...................\/...\....|....\.....
+.-........-./.....-.....\.......-..........\..-........\..-.....................................\..../...|....
+....-.........................|..\.....................................\./...............-............/.......
+..........|..\....-........./..............................|........................-.......|./|........\.....
+..\.........|..|..-|........\...-................|/..\......../.......-|..................||.-./..............
+.--..-.......-........./.................\....../.................-............................--.........-...
+.......|.........../......./........../..\.........\...\../..\..././.......-..................................
+.........-/...............|..\|.................\...........|............../............\.....................
+..........-.........\.-................|-..................../......../...|/...\..-....|-........-.......-....
+.--|.\|.......|.....-............................|.-....-...|...................|........../..................
+.....-......./..../.|...................|\..-.........../...|.............................\/../........../....
+......./........|.\......-../...........\........................./..........\.........-...\................|.
+./.......................\........-......|...|............................/............\....-.....|..../...\..
+....................-..............-..-.............../..\...../.\.........\................../.....\.....-...
+...................../......-....-.......|....|......../..|-...............\..\../.-.....././..........|......
+..\.....|...\............................./.../...../..../......../...........................................
+./.../................................../.....-.........|.....|..........-...............................-....
+...............|..\...-................................\.........................|....\...............-.-.....
+/........|.......|.....-.......-..-..-.\.................................-.\...-.......\.............-..\.....
+./......|../......|................................/.........||.-....................|..\.........-....|../...
+|..................................................\......|...-............................../.......-........
+....../...............-....-..................\....-../................................./.\.................-.
+......-...........-...../.....-......|..........\.\...-......../......\................--..............-......
+.............\/........|...../...........-.......\...|........................................................
+...\\........\..........|...\............/........-..../....-.....................-......................../..
+.......-......../......./..........-....|....-..\.........................\.............../..........-.....-..
+.....|\/..../.........|.........../|.....\.......-........-............../..././.............|................
+.........|....|....\..-....../............/.....\/....|.............\........................|.........-......
+.\\..........................//......................\....\...........................-.|/....................
+...................|...................-.|........................................../..........\..............
+......\..|....../...........\.-.........-.......-..|../........../.............................../.......-...|
+..........|................/|.....-.....\................||........./.............|.........../..-..|./.......
+............../../|.......\...............-..../|..../-..|................................../......-....|..|..
+............\...............\.........................\....-.............-..|/.....--...................-...-.
+.....|\......\...........................-.................-.......\...............|............|........../..
+.....\...-.............|............\........\...../.-...........|.-.................\.........|..............
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diff --git a/day-16/part-1/vanyle.nim b/day-16/part-1/vanyle.nim
new file mode 100644
index 0000000..5c20497
--- /dev/null
+++ b/day-16/part-1/vanyle.nim
@@ -0,0 +1,114 @@
+from times import cpuTime
+from os import paramStr
+
+import strutils
+
+proc parseInput(s: string): seq[string] = 
+    return s.strip.split("\n")
+
+type Dir = enum
+    LEFT = 0,
+    DOWN = 1,
+    RIGHT = 2,
+    UP = 3
+
+proc dirTuple(d: Dir): (int, int) =
+    case d:
+    of LEFT: return (0, -1)
+    of RIGHT: return (0, 1)
+    of UP: return (-1, 0)
+    of DOWN: return (1, 0)
+
+iterator processLightBit(lpos: (int, int), level: seq[string], d: Dir): (int, int, Dir) =
+    # Returns the position of light to change, if needed.
+    let c = level[lpos[0]][lpos[1]]
+    var lightPos = lpos
+    var ldir = dirTuple(d)
+    if c == '.':
+        lightPos[0] += ldir[0]
+        lightPos[1] += ldir[1]
+        yield (lightPos[0], lightPos[1], d)
+    elif c == '/' or c == '\\':
+        var newDir = d
+        if c == '/':
+            if d == LEFT: newDir = DOWN
+            elif d == DOWN: newDir = LEFT
+            elif d == UP: newDir = RIGHT
+            elif d == RIGHT: newDir = UP
+        elif c == '\\':
+            if d == LEFT: newDir = UP
+            elif d == UP: newDir = LEFT
+            elif d == DOWN: newDir = RIGHT
+            elif d == RIGHT: newDir = DOWN  
+
+        ldir = dirTuple(newDir)
+        lightPos[0] += ldir[0]
+        lightPos[1] += ldir[1]
+        yield (lightPos[0], lightPos[1], newDir)
+
+    elif c == '-':
+        if d == LEFT or d == RIGHT:
+            lightPos[0] += ldir[0]
+            lightPos[1] += ldir[1]
+            yield (lightPos[0], lightPos[1], d)   
+        else:
+            yield (lightPos[0], lightPos[1]-1, LEFT)
+            yield (lightPos[0], lightPos[1]+1, RIGHT)
+    elif c == '|':
+        if d == UP or d == DOWN:
+            lightPos[0] += ldir[0]
+            lightPos[1] += ldir[1]
+            yield (lightPos[0], lightPos[1], d)  
+        else:
+            yield (lightPos[0]+1, lightPos[1], DOWN)
+            yield (lightPos[0]-1, lightPos[1], UP)
+
+proc updateState(lstate: var array[110,array[110,set[Dir]]], y: int, x: int, d: Dir): bool =
+    # Check for out of bounds.
+    if y < 0 or y >= lstate.len: return false
+    if x < 0 or x >= lstate[y].len: return false
+
+    if d in lstate[y][x]: return false
+    lstate[y][x].incl d
+    return true
+
+var lstate: array[110,array[110, set[Dir]]]
+proc simulateLight(level: seq[string], entryi = 0, entryj = 0, entryd: Dir = Right): array[110,array[110, set[Dir]]] =
+    # Zero out lstate:
+    for i in 0..<lstate.len:
+        for j in 0..<lstate[0].len:
+            lstate[i][j] = {}
+
+    lstate[entryi][entryj] = {entryd} # top-right, going right.
+
+    var toProcess: seq[(int, int)] = @[(entryi, entryj)]
+    while toProcess.len > 0:
+        var (i, j) = toProcess.pop()
+        let rays = lstate[i][j]
+        for r in rays:
+            for lbit in processLightBit((i,j), level, r):
+                var (y,x,newd) = lbit
+                if lstate.updateState(y,x,newd):
+                    toProcess.add((y, x))
+
+    return lstate
+
+proc energized(lstate: array[110, array[110,set[Dir]]]): int =
+    for i in 0..<lstate.len:
+        for j in 0..<lstate[i].len:
+            if lstate[i][j].len > 0:
+                inc result
+
+proc run(s: string): string = 
+    var r = parseInput(s)
+    var lstate = simulateLight(r)
+
+    return $energized(lstate)
+
+var input: string = paramStr(1)
+
+var t0 = cpuTime()
+var output = run(input)
+
+echo "_duration:", (cpuTime() - t0) * 1000
+echo output
diff --git a/day-16/part-2/vanyle.nim b/day-16/part-2/vanyle.nim
new file mode 100644
index 0000000..34dcfbc
--- /dev/null
+++ b/day-16/part-2/vanyle.nim
@@ -0,0 +1,130 @@
+from times import cpuTime
+from os import paramStr
+
+import strutils
+
+proc parseInput(s: string): seq[string] = 
+    return s.strip.split("\n")
+
+type Dir = enum
+    LEFT = 0,
+    DOWN = 1,
+    RIGHT = 2,
+    UP = 3
+
+proc dirTuple(d: Dir): (int, int) =
+    case d:
+    of LEFT: return (0, -1)
+    of RIGHT: return (0, 1)
+    of UP: return (-1, 0)
+    of DOWN: return (1, 0)
+
+iterator processLightBit(lpos: (int, int), level: seq[string], d: Dir): (int, int, Dir) =
+    # Returns the position of light to change, if needed.
+    let c = level[lpos[0]][lpos[1]]
+    var lightPos = lpos
+    var ldir = dirTuple(d)
+    if c == '.':
+        lightPos[0] += ldir[0]
+        lightPos[1] += ldir[1]
+        yield (lightPos[0], lightPos[1], d)
+    elif c == '/' or c == '\\':
+        var newDir = d
+        if c == '/':
+            if d == LEFT: newDir = DOWN
+            elif d == DOWN: newDir = LEFT
+            elif d == UP: newDir = RIGHT
+            elif d == RIGHT: newDir = UP
+        elif c == '\\':
+            if d == LEFT: newDir = UP
+            elif d == UP: newDir = LEFT
+            elif d == DOWN: newDir = RIGHT
+            elif d == RIGHT: newDir = DOWN  
+
+        ldir = dirTuple(newDir)
+        lightPos[0] += ldir[0]
+        lightPos[1] += ldir[1]
+        yield (lightPos[0], lightPos[1], newDir)
+
+    elif c == '-':
+        if d == LEFT or d == RIGHT:
+            lightPos[0] += ldir[0]
+            lightPos[1] += ldir[1]
+            yield (lightPos[0], lightPos[1], d)   
+        else:
+            yield (lightPos[0], lightPos[1]-1, LEFT)
+            yield (lightPos[0], lightPos[1]+1, RIGHT)
+    elif c == '|':
+        if d == UP or d == DOWN:
+            lightPos[0] += ldir[0]
+            lightPos[1] += ldir[1]
+            yield (lightPos[0], lightPos[1], d)  
+        else:
+            yield (lightPos[0]+1, lightPos[1], DOWN)
+            yield (lightPos[0]-1, lightPos[1], UP)
+
+proc updateState(lstate: var array[110,array[110,set[Dir]]], y: int, x: int, d: Dir): bool =
+    # Check for out of bounds.
+    if y < 0 or y >= lstate.len: return false
+    if x < 0 or x >= lstate[y].len: return false
+
+    if d in lstate[y][x]: return false
+    lstate[y][x].incl d
+    return true
+
+var lstate: array[110,array[110, set[Dir]]]
+proc simulateLight(level: seq[string], entryi = 0, entryj = 0, entryd: Dir = Right): array[110,array[110, set[Dir]]] =
+    # Zero out lstate:
+    for i in 0..<lstate.len:
+        for j in 0..<lstate[0].len:
+            lstate[i][j] = {}
+
+    lstate[entryi][entryj] = {entryd} # top-right, going right.
+
+    var toProcess: seq[(int, int)] = @[(entryi, entryj)]
+    while toProcess.len > 0:
+        var (i, j) = toProcess.pop()
+        let rays = lstate[i][j]
+        for r in rays:
+            for lbit in processLightBit((i,j), level, r):
+                var (y,x,newd) = lbit
+                if lstate.updateState(y,x,newd):
+                    toProcess.add((y, x))
+
+    return lstate
+
+proc energized(lstate: array[110, array[110,set[Dir]]]): int =
+    for i in 0..<lstate.len:
+        for j in 0..<lstate[i].len:
+            if lstate[i][j].len > 0:
+                inc result
+
+proc run(s: string): string = 
+    var r = parseInput(s)
+
+    var menergy = 0
+
+    for i in 0..<r.len:
+        var lstate = simulateLight(r, i, 0, Right)
+        menergy = max(menergy, energized(lstate))
+
+        lstate = simulateLight(r, i, r.len-1, Left)
+        menergy = max(menergy, energized(lstate))
+
+    for j in 0..<r[0].len:
+        var lstate = simulateLight(r, 0, j, Down)
+        menergy = max(menergy, energized(lstate))
+
+        lstate = simulateLight(r, r[0].len-1, j, Up)
+        menergy = max(menergy, energized(lstate))
+
+    return $menergy
+
+
+var input: string = paramStr(1)
+
+var t0 = cpuTime()
+var output = run(input)
+
+echo "_duration:", (cpuTime() - t0) * 1000
+echo output
diff --git a/day-17/input/vanyle.txt b/day-17/input/vanyle.txt
new file mode 100644
index 0000000..9f7d1cb
--- /dev/null
+++ b/day-17/input/vanyle.txt
@@ -0,0 +1,141 @@
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\ No newline at end of file
diff --git a/day-17/part-1/vanyle.nim b/day-17/part-1/vanyle.nim
new file mode 100644
index 0000000..57f3500
--- /dev/null
+++ b/day-17/part-1/vanyle.nim
@@ -0,0 +1,162 @@
+from times import cpuTime
+from os import paramStr
+
+
+import heapqueue, tables, hashes, options, strutils
+
+# A Star implementation, from the astar package.
+
+type
+    Distance* = int|float
+    Node* = concept n
+        `==`(n, n) is bool
+        `hash`(n) is Hash
+
+    Graph* = concept g
+        var node: Node
+        for neighbor in g.neighbors(node):
+            type(neighbor) is Node
+        cost(g, node, node) is Distance
+
+    Point* = concept p
+        p.x is Distance
+        p.y is Distance
+
+
+type
+    FrontierElem[N, D] = tuple[node: N, priority: D, cost: D]
+    CameFrom[N, D] = tuple[node: N, cost: D]
+
+proc `<`(a, b: FrontierElem): bool = a.priority < b.priority
+
+iterator backtrack[N, D](
+    cameFrom: Table[N, CameFrom[N, D]], start, goal: N
+): N =
+    yield start
+    var current: N = goal
+    var path: seq[N] = @[]
+    while current != start:
+        path.add(current)
+        current = `[]`(cameFrom, current).node
+
+    for i in countdown(path.len - 1, 0):
+        yield path[i]
+
+proc calcHeuristic[G: Graph, N: Node, D: Distance] (
+    graph: G,
+    next, start, goal: N,
+    current: FrontierElem[N, D],
+    cameFrom: Table[N, CameFrom[N, D]],
+): D {.inline.} =
+    when compiles(graph.heuristic(next, start, goal, current.node)):
+        return D(graph.heuristic(next, start, goal, current.node))
+
+    elif compiles(graph.heuristic(next, start, goal, current.node, none(N))):
+        var grandparent: Option[N]
+        if cameFrom.hasKey(current.node):
+            grandparent = some[N]( `[]`(cameFrom, current.node).node )
+        else:
+            grandparent = none(N)
+        return D(graph.heuristic(next, start, goal, current.node, grandparent))
+
+    else:
+        return D(graph.heuristic(next, goal))
+
+iterator path*[G: Graph, N: Node, D: Distance](graph: G, start, goal: N): N =
+    var frontier = initHeapQueue[FrontierElem[N, D]]()
+    frontier.push( (node: start, priority: D(0), cost: D(0)) )
+    var cameFrom = initTable[N, CameFrom[N, D]]()
+
+    while frontier.len > 0:
+        let current = frontier.pop
+        if current.node == goal:
+            for node in backtrack(cameFrom, start, goal):
+                yield node
+            break
+
+        for next in graph.neighbors(current.node):
+            let cost = current.cost + D( graph.cost(current.node, next) )
+            if not cameFrom.hasKey(next) or cost < `[]`(cameFrom, next).cost:
+                `[]=`(cameFrom, next, (node: current.node, cost: cost))
+                let priority: D = cost + calcHeuristic[G, N, D](
+                    graph, next, start, goal, current, cameFrom )
+                frontier.push( (next, priority, cost) )
+
+## =======================================================================
+
+proc parseInput(s: string): seq[seq[int8]] = 
+    var lines = s.strip.split("\n")
+    result = newSeq[seq[int8]](lines.len)
+    for i in 0..<lines.len:
+        for j in lines[i]:
+            result[i].add parseInt($j).int8
+
+type Dir = enum
+    Up
+    Down
+    Left
+    Right
+
+type MyG = seq[seq[int8]]
+type MyN = (int16, int16, Dir) # x,y and Dir. You can only turn.
+
+template validatePos(grid: MyG, node: MyN) =
+    let isOk = node[0] >= 0 and node[1] >= 0 and node[0] < grid.len and node[1] < grid[node[0]].len
+    if isOk:
+        yield node
+
+iterator neighbors*(grid: MyG, node: MyN): MyN =
+    var (y, x, d) = node
+
+    if y == grid.len - 1 and x == grid[0].len - 1:
+        for i in Dir:
+            yield (y, x, i)
+    elif y == 0 and x == 0:
+        for i in Dir:
+            yield (y, x, i)
+
+    if d == Up or d == Down:
+        for i in 1..3:
+            validatePos(grid, (y, (x-i).int16, Left))
+            validatePos(grid, (y, (x+i).int16, Right))
+
+    elif d == Left or d == Right:
+        for i in 1..3:
+            validatePos(grid, ((y-i).int16, x, Up))
+            validatePos(grid, ((y+i).int16, x, Down))
+
+proc cost*(grid: MyG, a: MyN, b: MyN): int =
+    if a[0] == b[0] and a[1] == b[1]:
+        return 0
+
+    for i in min(a[0],b[0])..max(a[0],b[0]):
+        for j in min(a[1],b[1])..max(b[1],a[1]):
+            if i != a[0] or j != a[1]:
+                result += grid[i][j]
+
+proc heuristic*(grid: MyG, a: MyN, b: MyN): int =
+    return max(a[0] - b[0], a[1] - b[1])
+
+proc run(s: string): string = 
+    var r = parseInput(s)
+
+    var start = (0.int16, 0.int16, Down)
+    var dest = ((r.len - 1).int16, (r[0].len - 1).int16, Right)
+    var pcost = 0
+
+    var currentPos = start
+    for pt in path[MyG, MyN, int](r, start, dest):
+        if currentPos != pt:
+            pcost += r.cost(currentPos, pt)
+            currentPos = pt
+
+    return $pcost
+
+
+var input: string = paramStr(1)
+
+var t0 = cpuTime()
+var output = run(input)
+
+echo "_duration:", (cpuTime() - t0) * 1000
+echo output
diff --git a/day-17/part-2/vanyle.nim b/day-17/part-2/vanyle.nim
new file mode 100644
index 0000000..0bc858f
--- /dev/null
+++ b/day-17/part-2/vanyle.nim
@@ -0,0 +1,161 @@
+from times import cpuTime
+from os import paramStr
+
+import heapqueue, tables, hashes, options, strutils
+
+# A Star implementation, from the astar package.
+
+type
+    Distance* = int|float
+    Node* = concept n
+        `==`(n, n) is bool
+        `hash`(n) is Hash
+
+    Graph* = concept g
+        var node: Node
+        for neighbor in g.neighbors(node):
+            type(neighbor) is Node
+        cost(g, node, node) is Distance
+
+    Point* = concept p
+        p.x is Distance
+        p.y is Distance
+
+
+type
+    FrontierElem[N, D] = tuple[node: N, priority: D, cost: D]
+    CameFrom[N, D] = tuple[node: N, cost: D]
+
+proc `<`(a, b: FrontierElem): bool = a.priority < b.priority
+
+iterator backtrack[N, D](
+    cameFrom: Table[N, CameFrom[N, D]], start, goal: N
+): N =
+    yield start
+    var current: N = goal
+    var path: seq[N] = @[]
+    while current != start:
+        path.add(current)
+        current = `[]`(cameFrom, current).node
+
+    for i in countdown(path.len - 1, 0):
+        yield path[i]
+
+proc calcHeuristic[G: Graph, N: Node, D: Distance] (
+    graph: G,
+    next, start, goal: N,
+    current: FrontierElem[N, D],
+    cameFrom: Table[N, CameFrom[N, D]],
+): D {.inline.} =
+    when compiles(graph.heuristic(next, start, goal, current.node)):
+        return D(graph.heuristic(next, start, goal, current.node))
+
+    elif compiles(graph.heuristic(next, start, goal, current.node, none(N))):
+        var grandparent: Option[N]
+        if cameFrom.hasKey(current.node):
+            grandparent = some[N]( `[]`(cameFrom, current.node).node )
+        else:
+            grandparent = none(N)
+        return D(graph.heuristic(next, start, goal, current.node, grandparent))
+
+    else:
+        return D(graph.heuristic(next, goal))
+
+iterator path*[G: Graph, N: Node, D: Distance](graph: G, start, goal: N): N =
+    var frontier = initHeapQueue[FrontierElem[N, D]]()
+    frontier.push( (node: start, priority: D(0), cost: D(0)) )
+    var cameFrom = initTable[N, CameFrom[N, D]]()
+
+    while frontier.len > 0:
+        let current = frontier.pop
+        if current.node == goal:
+            for node in backtrack(cameFrom, start, goal):
+                yield node
+            break
+
+        for next in graph.neighbors(current.node):
+            let cost = current.cost + D( graph.cost(current.node, next) )
+            if not cameFrom.hasKey(next) or cost < `[]`(cameFrom, next).cost:
+                `[]=`(cameFrom, next, (node: current.node, cost: cost))
+                let priority: D = cost + calcHeuristic[G, N, D](
+                    graph, next, start, goal, current, cameFrom )
+                frontier.push( (next, priority, cost) )
+
+## =======================================================================
+
+proc parseInput(s: string): seq[seq[int8]] = 
+    var lines = s.strip.split("\n")
+    result = newSeq[seq[int8]](lines.len)
+    for i in 0..<lines.len:
+        for j in lines[i]:
+            result[i].add parseInt($j).int8
+
+type Dir = enum
+    Up
+    Down
+    Left
+    Right
+
+type MyG = seq[seq[int8]]
+type MyN = (int16, int16, Dir) # x,y and Dir. You can only turn.
+
+template validatePos(grid: MyG, node: MyN) =
+    let isOk = node[0] >= 0 and node[1] >= 0 and node[0] < grid.len and node[1] < grid[node[0]].len
+    if isOk:
+        yield node
+
+proc cost*(grid: MyG, a: MyN, b: MyN): int =
+    if a[0] == b[0] and a[1] == b[1]:
+        return 0
+
+    for i in min(a[0],b[0])..max(a[0],b[0]):
+        for j in min(a[1],b[1])..max(b[1],a[1]):
+            if i != a[0] or j != a[1]:
+                result += grid[i][j]
+
+proc heuristic*(grid: MyG, a: MyN, b: MyN): int =
+    return max(abs(a[0] - b[0]),abs(a[1] - b[1]))
+
+iterator neighbors*(grid: MyG, node: MyN): MyN =
+    var (y, x, d) = node
+
+    if y == grid.len - 1 and x == grid[0].len - 1:
+        for i in Dir:
+            yield (y, x, i)
+    elif y == 0 and x == 0:
+        for i in Dir:
+            yield (y, x, i)
+
+    if d == Up or d == Down:
+        for i in 4..10:
+            validatePos(grid, (y, (x-i).int16, Left))
+            validatePos(grid, (y, (x+i).int16, Right))
+
+    elif d == Left or d == Right:
+        for i in 4..10:
+            validatePos(grid, ((y-i).int16, x, Up))
+            validatePos(grid, ((y+i).int16, x, Down))
+
+proc run(s: string): string = 
+    var r = parseInput(s)
+
+    var start: MyN = (0, 0, Down)
+    var dest: MyN = ((r.len - 1).int16, (r[0].len - 1).int16, Right)
+    var pcost = 0
+
+    var currentPos = start
+    for pt in path[MyG, MyN, int](r, start, dest):
+        if currentPos != pt:
+            pcost += r.cost(currentPos, pt)
+            currentPos = pt
+
+    return $pcost
+
+
+var input: string = paramStr(1)
+
+var t0 = cpuTime()
+var output = run(input)
+
+echo "_duration:", (cpuTime() - t0) * 1000
+echo output