Add day 7 (part 2 is slow but idc, use pypy)

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

day07/day07.py

@@ -0,0 +1,30 @@
+#!/usr/bin/env python3
+import sys
+from typing import Sequence
+
+
+def part1(positions: Sequence[int]):
+    lo = min(positions)
+    hi = max(positions)
+    diffs = []
+    for i in range(lo, hi + 1):
+        diffs += [sum(abs(pos - i) for pos in positions)]
+    print(min(diffs))
+
+
+def part2(positions: Sequence[int]):
+    lo = min(positions)
+    hi = max(positions)
+    diffs = []
+    for i in range(lo, hi + 1):
+        diffs += [sum(sum(range(abs(pos - i) + 1)) for pos in positions)]
+
+    print(min(diffs))
+
+
+positions = list(map(int, sys.stdin.readline().strip().split(",")))
+
+print("Part 1")
+part1(positions)
+print("Part 2")
+part2(positions)