From a9fb336ca4774ae96bcdbfd2c9e52619df76e172 Mon Sep 17 00:00:00 2001
From: Alex Karle <alex@alexkarle.com>
Date: Sat, 11 Dec 2021 11:53:37 -0500
Subject: [PATCH] day10: Add Python solution

Ah, a classic queue problem! Push-down automata and all that :)
---
 10/a.py  | 30 ++++++++++++++++++++++++++++++
 10/b.py  | 58 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 10/input | 90 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 178 insertions(+)
 create mode 100755 10/a.py
 create mode 100755 10/b.py
 create mode 100644 10/input

diff --git a/10/a.py b/10/a.py
new file mode 100755
index 0000000..7af6418
--- /dev/null
+++ b/10/a.py
@@ -0,0 +1,30 @@
+#!/usr/bin/env python3
+import sys
+from collections import defaultdict
+
+match = {
+    "}": "{",
+    ")": "(",
+    ">": "<",
+    "]": "[",
+}
+
+bad = defaultdict(int)
+for l in sys.stdin:
+    mem = []
+    for c in l.strip():
+        if c in ["{", "(", "<", "["]:
+            mem.append(c)
+        elif c in ["}", ")", ">", "]"]:
+            m = match[c]
+            if mem.pop() != m:
+                bad[c] += 1
+                break
+        else:
+            raise Exception(f"Bad char: {c}")
+
+# ): 3 points.
+# ]: 57 points.
+# }: 1197 points.
+# >: 25137 points.
+print(bad["}"] * 1197 + bad[")"] * 3 + bad[">"] * 25137 + bad["]"] * 57)
diff --git a/10/b.py b/10/b.py
new file mode 100755
index 0000000..4758311
--- /dev/null
+++ b/10/b.py
@@ -0,0 +1,58 @@
+#!/usr/bin/env python3
+import sys
+from collections import defaultdict
+
+match = {
+    "}": "{",
+    ")": "(",
+    ">": "<",
+    "]": "[",
+}
+
+rmatch = {
+    "{": "}",
+    "(": ")",
+    "<": ">",
+    "[": "]",
+}
+
+pts = {
+    ")": 1,
+    "]": 2,
+    "}": 3,
+    ">": 4,
+}
+
+
+def score(seq):
+    score = 0
+    for c in seq:
+        score *= 5
+        score += pts[c]
+    return score
+
+
+scores = []
+for l in sys.stdin:
+    mem = []
+    corrupt = False
+    for c in l.strip():
+        if c in ["{", "(", "<", "["]:
+            mem.append(c)
+        elif c in ["}", ")", ">", "]"]:
+            m = match[c]
+            if mem.pop() != m:
+                # this is an corrupt line, skip it!
+                corrupt = True
+                break
+        else:
+            raise Exception(f"Bad char: {c}")
+
+    # Figure out and score the remaining chars!
+    if not corrupt:
+        mem.reverse()
+        remaining = [rmatch[c] for c in mem]
+        scores.append(score(remaining))
+
+ss = sorted(scores)
+print(ss[int(len(ss) / 2)])
diff --git a/10/input b/10/input
new file mode 100644
index 0000000..88ead12
--- /dev/null
+++ b/10/input
@@ -0,0 +1,90 @@
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+[[{<(([<<{(<[[()()]]{[[]()]<{}>}><{{{}()}<<>[]>><(())[()[]]>>)([{[[][]][()()]}{{()()}}](<{{}()}>))}[([{<<
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