2021 day10/python: add solution

2021/day10/day10.py

@@ -0,0 +1,30 @@
+#!/usr/bin/env python
+
+import sys
+
+if __name__ == '__main__':
+    syntax_check_score = 0
+    autocomplete_scores = []
+    for line in sys.stdin.readlines():
+        stack = []
+        corrupted = False
+
+        for c in line.strip():
+            if c in '([{<':
+                stack.append({'(': ')', '[': ']', '{': '}', '<': '>'}[c])
+            elif stack.pop() != c:
+                syntax_check_score += {')': 3, ']': 57, '}': 1197, '>': 25137}[c]
+                corrupted = True
+                break
+
+        if corrupted: continue
+
+        autocomplete_score = 0
+        for c in stack[::-1]:
+            autocomplete_score *= 5
+            autocomplete_score += {')': 1, ']': 2, '}': 3, '>': 4}[c]
+        autocomplete_scores.append(autocomplete_score)
+
+    print(syntax_check_score)
+    autocomplete_scores.sort()
+    print(autocomplete_scores[len(autocomplete_scores)//2])