1 files changed, 72 insertions, 0 deletions
diff --git a/13/main.py b/13/main.py
new file mode 100755
index 0000000..31bd337
--- /dev/null
+++ b/13/main.py
@@ -0,0 +1,72 @@
+#!/usr/bin/python
+
+from itertools import permutations
+
+
+
+def parse_input(lines):
+    data = {}
+
+    for l in lines:
+        words = l.split()
+        name1 = words[ 0]
+        name2 = words[10].rstrip(".")
+        if words[2] == "gain":
+            score = int(words[3])
+        else: # words[2] == "lose"
+            score = -int(words[3])
+
+        if name1 not in data:
+            data[name1] = {}
+        data[name1][name2] = score
+
+    return data
+
+
+
+def best_score(data):
+    names = list(data.keys())
+    perms = permutations(names)
+    scores = []
+    for p in perms:
+        score = 0
+        for i in range(len(p)):
+            n1 = p[i]
+            n2 = p[(i + 1) % len(p)]
+            score += data[n1][n2] + data[n2][n1]
+        scores.append(score)
+    return max(scores)
+
+
+
+def solve_part1(lines):
+    data = parse_input(lines)
+    return best_score(data)
+
+
+
+def solve_part2(lines):
+    data = parse_input(lines)
+
+    data["Myself"] = {}
+    names = list(data.keys())
+    for n in names:
+        data["Myself"][n] = 0
+        data[n]["Myself"] = 0
+
+    return best_score(data)
+
+
+
+def main():
+    # Read happiness relations from input text file
+    with open("input.txt", "r") as f:
+        lines = f.read().splitlines()
+
+    print("Part 1 solution:", solve_part1(lines)) # 709 for me
+    print("Part 2 solution:", solve_part2(lines)) # 668 for me
+
+
+
+if __name__ == "__main__":
+    main()