init

9D.py

@@ -0,0 +1,41 @@
+import sys
+
+input_data = sys.stdin.read().split()
+s_len = int(input_data[0])
+t_len = int(input_data[1])
+k = int(input_data[2])
+S = input_data[3]
+T = input_data[4]
+
+mask_S = {}
+for char in "ACGT":
+    valid = [0] * s_len
+    
+    last = -1000000
+    for i in range(s_len):
+        if S[i] == char:
+            last = i
+        if i - last <= k:
+            valid[i] = 1
+            
+    last = 1000000
+    for i in range(s_len - 1, -1, -1):
+        if S[i] == char:
+            last = i
+        if last - i <= k:
+            valid[i] = 1
+            
+    b = bytearray((s_len + 7) // 8)
+    for i in range(s_len):
+        if valid[i]:
+            b[i // 8] |= (1 << (i % 8))
+            
+    mask_S[char] = int.from_bytes(b, byteorder='little')
+
+ans_mask = (1 << (s_len - t_len + 1)) - 1
+ans_mask &= mask_S[T[0]]
+
+for j in range(1, t_len):
+    ans_mask = (ans_mask << 1) & mask_S[T[j]]
+
+print(ans_mask.bit_count())