init

5C.py

@@ -0,0 +1,23 @@
+import sys
+
+data = sys.stdin.read().split()
+a, b = data[0], data[1]
+n = len(a)
+st = a + "#" + b + b
+total_len = len(st)
+z = [0] * total_len
+l, r = 0, 0
+ans = -1
+for i in range(1, total_len):
+    if i <= r:
+        z[i] = min(r - i + 1, z[i - l])
+    while i + z[i] < total_len and st[z[i]] == st[i + z[i]]:
+        z[i] += 1
+    if i + z[i] - 1 > r:
+        l = i
+        r = i + z[i] - 1
+    if n + 1 <= i < 2 * n + 1:
+        if z[i] == n:
+            ans = i - (n + 1)
+            break
+print(ans)