Add day 7 solution

day-07/day-07.py

@@ -0,0 +1,43 @@
+#!/usr/bin/env python3
+from pathlib import Path
+
+
+def calc_fuel(crabs, h):
+    fuel = 0
+    for c in crabs:
+        fuel += abs(h - c)
+    return fuel
+ 
+
+def calc_fuel_exp(crabs, h):
+    fuel = 0
+    for c in crabs:
+        d = abs(h - c)
+        fuel += d * (d + 1) // 2
+    return fuel
+
+
+def part_1(input):
+    result = 0
+    c_pos = [int(x) for x in input[0].split(',')]
+    result = calc_fuel(c_pos, c_pos[0])
+    for i in range(min(c_pos), max(c_pos) + 1):
+        result = min(result, calc_fuel(c_pos, i))
+    print("Part 1 result:", result)
+
+
+def part_2(input):
+    result = 0
+    c_pos = [int(x) for x in input[0].split(',')]
+    result = calc_fuel_exp(c_pos, c_pos[0])
+    for i in range(min(c_pos), max(c_pos) + 1):
+        result = min(result, calc_fuel_exp(c_pos, i))
+    print("Part 2 result:", result)
+
+
+input = list()
+p = Path(__file__).with_name('input.txt')
+with open(p) as f:
+    input = f.readlines()
+    part_1(input)
+    part_2(input)