Solve day 4

2019/day04-password.py

@@ -0,0 +1,23 @@
+def matches(num):
+    previous = ""
+    two_adjacents = False
+    for digit in str(num):
+        if digit == previous:
+            two_adjacents = True
+        if digit < previous:
+            return 0
+        previous = digit
+
+    return 1 if two_adjacents else 0
+
+
+def main():
+    count = 0
+    for password in range(271973, 785961 + 1):
+        count += matches(password)
+
+    print(count)
+
+
+if __name__ == "__main__":
+    main()