2 files changed, 94 insertions, 0 deletions
diff --git a/11/main.py b/11/main.py
new file mode 100755
index 0000000..9939d42
--- /dev/null
+++ b/11/main.py
@@ -0,0 +1,71 @@
+#!/usr/bin/python
+
+
+
+def increment(string):
+    last = string[-1]
+    if last == "z":
+        return increment(string[0:-1]) + "a"
+    else:
+        return string[0:-1] + chr(ord(last) + 1)
+
+
+
+def solve_part1(old):
+    valid = False
+    while not valid:
+        new = increment(old)
+
+        # Rule 2: no "i", "o" or "l"
+        # Cheap to check and likely to fail, so we do this first
+        rule2 = True
+        for c in ["i", "o", "l"]:
+            if new.count(c) > 0:
+                rule2 = False
+                break
+        if not rule2:
+            old = new
+            continue
+
+        # Rule 1: one increasing straight of three letters
+        rule1 = False
+        ords = [ord(c) for c in new]
+        for i in range(len(new) - 2):
+            if ords[i + 1] == ords[i] + 1 and ords[i + 2] == ords[i] + 2:
+                rule1 = True
+                break
+
+        # Rule 3: two different pair of letters
+        rule3 = False
+        count = 0
+        taken = []
+        for i in range(len(new) - 1):
+            if new[i] not in taken and new[i] == new[i + 1]:
+                count += 1
+                taken.append(new[i])
+        if count >= 2:
+            rule3 = True
+
+        old = new
+        valid = rule1 and rule3
+
+    return new
+
+
+
+def solve_part2(old):
+    return solve_part1(solve_part1(old))
+
+
+
+def main():
+    # My personal input password
+    passwd = "vzbxkghb"
+
+    print("Part 1 solution:", solve_part1(passwd)) # "vzbxxyzz" for me
+    print("Part 2 solution:", solve_part2(passwd)) # "vzcaabcc" for me
+
+
+
+if __name__ == "__main__":
+    main()
diff --git a/11/test.py b/11/test.py
new file mode 100755
index 0000000..b77bd46
--- /dev/null
+++ b/11/test.py
@@ -0,0 +1,23 @@
+#!/usr/bin/python
+
+import unittest
+
+import main
+
+
+
+class ExamplesPart1(unittest.TestCase):
+    def test_example1(self):
+        old = "abcdefgh"
+        new = "abcdffaa"
+        self.assertEqual(main.solve_part1(old), new)
+
+    def test_example2(self):
+        old = "ghijklmn"
+        new = "ghjaabcc"
+        self.assertEqual(main.solve_part1(old), new)
+
+
+
+if __name__ == "__main__":
+    unittest.main()