19-wkdghdwns199

wkdghdwns199/ACM-25192.py

@@ -0,0 +1,19 @@
+import sys
+input = sys.stdin.readline
+N = int(input())
+emoji_using_users = set()
+time_for_emoji_use = False
+emoji_use_count = 0
+for _ in range(N):
+    chat_string = input().rstrip()
+    if chat_string == 'ENTER' :
+        if time_for_emoji_use :
+            emoji_use_count += len(emoji_using_users)
+        else :
+            time_for_emoji_use = True
+        emoji_using_users = set()
+    else :
+        emoji_using_users.add(chat_string)
+
+emoji_use_count+=len(emoji_using_users)
+print(emoji_use_count)

wkdghdwns199/README.md

@@ -18,4 +18,5 @@
 | 14차시 | 2024.03.13 | 집합과 맵 |  <a href="https://www.acmicpc.net/problem/20920">영단어 암기는 괴로워</a>  | <a href="">2024.03.13</a> |
 | 15차시 | 2024.03.20 | 우선순위 큐 |  <a href="https://www.acmicpc.net/problem/11286">절댓값 힙</a>  | <a href="">2024.03.20</a> |
 | 16차시 | 2024.03.23 | 조합론 |  <a href="https://www.acmicpc.net/problem/11050">이항 계수 1 </a>  | <a href="">2024.03.23</a> |
+| 19차시 | 2024.04.07 | 조합론 |  <a href="https://www.acmicpc.net/problem/25192">인사성 밝은 곰곰이</a>  | <a href="">2024.04.07</a> |