Day 3: Add Python solution

03/solution_1.py

@@ -0,0 +1,9 @@
+#!/usr/bin/env python3
+from collections import Counter
+
+with open("input.txt", "r") as _input:
+    most_common_bits = [Counter(col).most_common(2) for col in zip(*[l.rstrip() for l in _input.readlines()][::-1])]
+
+gamma, epsilon = [int("".join(x)[::-1], 2) for x in zip(*[(x[0], y[0]) for x, y in most_common_bits][::-1])]
+
+print("Answer:", gamma * epsilon)

03/solution_2.py

@@ -0,0 +1,21 @@
+#!/usr/bin/env python3
+from collections import Counter
+
+def flt(data, most):
+    positions = len(data[0])
+    for i in range(positions):
+        cnt = Counter(list(zip(*data[::-1]))[i]).most_common(2)
+        if len(cnt) > 1:
+            if cnt[0][1] == cnt[1][1]:
+                cond = '1' if most else '0'
+            else:
+                cond = cnt[0 if most else 1][0]
+            data = [x for x in data if x[i] == cond]
+            if len(data) == 1:
+                break
+    return data[0]
+
+with open("input.txt", "r") as _input:
+    data = [l.rstrip() for l in _input.readlines()]
+
+print("Answer:", int(flt(data, True), 2) * int(flt(data, False), 2))