Day 10.

2021/10/main2.py

@@ -0,0 +1,33 @@
+openers = ['(', '[', '{', '<']
+closers = [')', ']', '}', '>']
+points = [3, 57, 1197, 25137]
+
+scores = []
+with open('data', 'r') as fp:
+    # NOTE(dev): We assume all lines are the same length
+    for line in fp:
+        stack = []
+        corrupt = False
+        for ch in line.strip():
+            if(ch in openers):
+                stack.append(ch)
+            else:
+                try:
+                    i = closers.index(ch)
+                    last = stack[-1]
+                    stack.pop()
+                    if(last != openers[i]):
+                        corrupt = True
+                        break
+                except ValueError: # not an opener or closer!
+                    pass
+        if(not corrupt and len(stack)):
+            line_score = 0
+            for ch in reversed(stack):
+                line_score *= 5
+                line_score += openers.index(ch) + 1
+            scores.append(line_score)
+
+scores.sort()
+print('scores[int(', len(scores), '/ 2 )]')
+print(scores[int(len(scores) / 2)])