AoC 2018 - Day 2

2/checksum.py

@@ -0,0 +1,65 @@
+#!/usr/bin/env python3
+
+import sys
+def checksum(l):
+    double = 0
+    triple = 0
+    for item in l:
+        d, t = count_duplicate(item)
+        double += d
+        triple += t
+    return double * triple
+
+def count_duplicate(item):
+    double = 0
+    triple = 0
+    c = dict()
+    for i in item:
+        if i in c:
+            c[i] += 1
+        else:
+            c[i] = 1
+    for k,v in c.items():
+        if v == 2:
+            double = 1
+        if v == 3:
+            triple = 1
+    #print(c)
+    #print("{}: {}, {}".format(item, double, triple))
+    return (double, triple)
+
+def compare(item, l):
+    for candidate in l:
+        if candidate == item:
+            continue
+        diff = 0
+        x = 0
+        while x < len(item):
+            if item[x] != candidate[x]:
+                diff += 1
+            x += 1
+            if diff > 1:
+                break
+        #if diff > 1:
+        #    print("{} does not match {}: {} different".format(item, candidate, diff))
+        if diff == 1:
+            return candidate
+
+def common(x, y):
+    i = 0
+    common = ""
+    while i < len(x):
+        if x[i] == y[i]:
+            common += x[i]
+        i += 1
+    return common
+
+if __name__ == '__main__':
+    l = sys.stdin.readlines()
+    print(checksum(l))
+    for item in l:
+        z = compare(item, l)
+        if z is not None:
+            print("{} / {}".format(item, z))
+            print(common(item, z))
+            break

2/checksum.py~

@@ -0,0 +1,30 @@
+#!/usr/bin/env python3
+
+def checksum(l):
+    double = 0
+    triple = 0
+    for item in l:
+        d, t = count_duplicate(item)
+        double += d
+        triple += t
+    return double * triple
+
+def count_duplicate(item):
+    double = 0
+    triple = 0
+    c = dict()
+    for i in item:
+        if i in c:
+            c[i] += 1
+        else:
+            c[i] = 1
+    for k,v in c.items():
+        if v == 2:
+            double =11
+        if v == 3:
+            triple = 1
+    return (double, triple)
+
+if __name__ == '__main__':
+    l = sys.stdin.readlines()
+    print(checksum(l))

2/input

@@ -0,0 +1,250 @@
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