diff --git a/.DS_Store b/.DS_Store
new file mode 100644
index 0000000..470aa0e
Binary files /dev/null and b/.DS_Store differ
diff --git a/src/.DS_Store b/src/.DS_Store
new file mode 100644
index 0000000..9b761ab
Binary files /dev/null and b/src/.DS_Store differ
diff --git a/src/lab/.DS_Store b/src/lab/.DS_Store
new file mode 100644
index 0000000..241e52e
Binary files /dev/null and b/src/lab/.DS_Store differ
diff --git a/src/lab/exp3/quick_pscode.txt b/src/lab/exp3/quick_pscode.txt
index d76fcce..55267c9 100644
--- a/src/lab/exp3/quick_pscode.txt
+++ b/src/lab/exp3/quick_pscode.txt
@@ -1,2 +1,29 @@
-quick sort
-
+Quick Sort- pseudo code
+
+
+Quicksort(A,p,r) {
+    if (p < r) {
+       q <- Partition(A,p,r)
+       Quicksort(A,p,q)
+       Quicksort(A,q+1,r)
+    }
+}
+
+
+
+Partition(A,p,r)
+    x <- A[p]
+    i <- p-1
+    j <- r+1
+    while (True) {
+        repeat
+            j <- j-1
+        until (A[j] <= x)
+        repeat
+            i <- i+1
+        until (A[i] >= x)
+        if (i A[j]
+        else 
+            return(j)
+    }
+}