From 5d959e5aadf5f46f2b236a1edfeac04687eae9ce Mon Sep 17 00:00:00 2001
From: Andrew Ekstedt <andrew.ekstedt@gmail.com>
Date: Fri, 2 Dec 2022 21:27:37 -0800
Subject: [PATCH] day 3

---
 day03/input  | 300 +++++++++++++++++++++++++++++++++++++++++++++++++++
 day03/sol.py |  29 +++++
 2 files changed, 329 insertions(+)
 create mode 100644 day03/input
 create mode 100644 day03/sol.py

diff --git a/day03/input b/day03/input
new file mode 100644
index 0000000..52a8658
--- /dev/null
+++ b/day03/input
@@ -0,0 +1,300 @@
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diff --git a/day03/sol.py b/day03/sol.py
new file mode 100644
index 0000000..32a8f61
--- /dev/null
+++ b/day03/sol.py
@@ -0,0 +1,29 @@
+import string
+letters = string.ascii_lowercase + string.ascii_uppercase
+
+rs = []
+t = 0
+for line in open("input"):
+    n = len(line.strip())
+    n //= 2
+    a, b = line[:n], line[n:]
+    rs.append(set(line[:2*n]))
+    u = set(a) & set(b)
+    assert len(u) == 1
+    x = list(u)[0]
+    #print(x)
+    t += 1 + letters.index(x)
+
+print(t)
+
+t = 0
+for i in range(0, len(rs), 3):
+    a, b, c = rs[i:i+3]
+    #print(a & b & c)
+    u = a&b&c
+    assert len(u) == 1
+    x = list(u)[0]
+    t += 1 + letters.index(x)
+
+print(t)
+