day 3

d03/part1.py

@@ -0,0 +1,16 @@
+import sys
+
+def p(c):
+	o = ord(c)
+	if o > 96:
+		return o-96
+	else:
+		return o-64+26
+
+def gen():
+	for line in sys.stdin:
+		(l,r) = line[:len(line)//2], line[len(line)//2:-1]
+		b = set(l) & set(r)
+		yield list(b)[0]
+
+print(sum(p(c) for c in gen()))

d03/part2.awk

@@ -0,0 +1,25 @@
+NR %3 == 1 { split($0, arr, "") 
+	for (a in arr) {
+		A[arr[a]]=1
+	}
+}
+NR %3 == 2 { split($0, arr, "") 
+	for (a in arr) {
+		B[arr[a]]=1
+	}
+}
+NR %3 == 0 {
+	split($0, arr, "")
+	for (a in arr) {
+		c = arr[a]
+		if ((c in A) && (c in B)) {
+			comm = c
+		}
+	}
+	i = index("abcdefghijklmnopqrstuvwxyz", comm)
+	j = index("ABCDEFGHIJKLMNOPQRSTUVWXYZ", comm)+26
+	S += i > 0 ? i : j
+	delete A
+	delete B
+}
+END { print S}

d03/part2.py

@@ -0,0 +1,18 @@
+import sys
+
+def p(c):
+	o = ord(c)
+	if o > 96:
+		return o-96
+	else:
+		return o-64+26
+
+def gen():
+	for _ in range(100):
+		g1 = next(sys.stdin)[:-1]
+		g2 = next(sys.stdin)[:-1]
+		g3 = next(sys.stdin)[:-1]
+		b = set(g1) & set(g2) & set(g3)
+		yield list(b)[0]
+
+print(sum(p(c) for c in gen()))