02

02/02-01.py

@@ -0,0 +1,34 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+def is_increasing(l:list[str]) -> bool:
+    for i in range(1,len(l)):
+        pre, n  = int(l[i-1]), int(l[i])
+        if pre >= n or n-pre > 3:
+            return False
+    return True
+
+def is_decreasing(l:list[str]) -> bool:
+    for i in range(1, len(l)):
+        pre, n  = int(l[i - 1]), int(l[i])
+        if pre <= n or pre-n > 3:
+            return False
+    return True
+
+
+def check_line(lin:str) -> bool:
+    l = lin.split()
+    if is_increasing(l) or is_decreasing(l):
+        return True
+    else:
+        return False
+
+
+if __name__ == "__main__":
+    safe = 0
+    input_file = open("input.txt", "r")
+    for line in input_file:
+        if check_line(line):
+            safe += 1
+    input_file.close()
+    print(f'Safe:{safe}')