1 files changed, 73 insertions, 0 deletions
diff --git a/05/main.py b/05/main.py
new file mode 100755
index 0000000..876d20c
--- /dev/null
+++ b/05/main.py
@@ -0,0 +1,73 @@
+#!/usr/bin/python
+
+
+
+def solve_part1(lines):
+    result = 0
+
+    for line in lines:
+        # Rule 1: at least three vowels
+        nvowels = 0
+        for v in "aeiou":
+            nvowels += line.count(v)
+        rule1 = nvowels >= 3
+
+        # Rule 2: at least one double letter
+        rule2 = False
+        for i in range(len(line) - 1):
+            if line[i] == line[i + 1]:
+                rule2 = True
+                break
+
+        # Rule 3: no "ab", "cd", "pq" or "xy"
+        rule3 = True
+        for s in ["ab", "cd", "pq", "xy"]:
+            if line.count(s) > 0:
+                rule3 = False
+                break
+
+        if rule1 and rule2 and rule3:
+            result += 1
+
+    return result
+
+
+
+def solve_part2(lines):
+    result = 0
+
+    for line in lines:
+        # Rule 1: twice-occurring two-letter sequence
+        rule1 = False
+        for i in range(len(line) - 1):
+            s = line[i : i + 2]
+            if line.count(s) >= 2:
+                rule1 = True
+                break
+
+        # Rule 2: ABA-like sequence
+        rule2 = False
+        for i, c in enumerate(line):
+            if i < len(line) - 2 and line[i + 2] == c:
+                rule2 = True
+                break
+
+        if rule1 and rule2:
+            result += 1
+
+    return result
+
+
+
+def main():
+    # Read list of strings from input text file
+    with open("input.txt", "r") as f:
+        lines = f.read().splitlines()
+
+    print("Part 1 solution:", solve_part1(lines)) # 258 for me
+    print("Part 2 solution:", solve_part2(lines)) #  53 for me
+
+
+
+if __name__ == "__main__":
+    main()