day4

4/4.py

@@ -0,0 +1,19 @@
+#!/usr/bin/env python3
+
+import sys
+
+start = 125730
+end = 579381
+
+for x in range(start, end+1):
+  s = str(x)
+  fail=False
+  double=False
+  for n in range(0,5):
+    if s[n] > s[n+1]:
+      fail = True
+      break
+    if s[n] == s[n+1]:
+      double = True
+  if double and not fail:
+    print(x)