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Diffstat (limited to '2/sol.py')
| -rw-r--r-- | 2/sol.py | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/2/sol.py b/2/sol.py new file mode 100644 index 0000000..901f9fe --- /dev/null +++ b/2/sol.py @@ -0,0 +1,45 @@ +from dataclasses import dataclass +from typing import List + +@dataclass +class Box: + w: int + h: int + d: int + + @staticmethod + def from_string(s: str) -> 'Box': + w, h, d = map(int, s.split('x')) + return Box(w, h, d) + + def surface_area(self) -> int: + return 2 * self.w * self.h + 2 * self.h * self.d + 2 * self.d * self.w + + def smallest_side_area(self) -> int: + return min(self.w * self.h, self.h * self.d, self.d * self.w) + + def wrapping_paper_area(self) -> int: + return self.surface_area() + self.smallest_side_area() + + def smallest_perimeter(self) -> int: + return 2 * (self.w + self.h + self.d - max(self.w, self.h, self.d)) + + def ribbon_length(self) -> int: + """The ribbon required to wrap a present is the shortest distance around + its sides, or the smallest perimeter of any one face. Each present also + requires a bow made out of ribbon as well; the feet of ribbon required + for the perfect bow is equal to the cubic feet of volume of the + present.""" + return self.smallest_perimeter() + self.w * self.h * self.d + +def part1(boxes: List[Box]) -> int: + return sum(box.wrapping_paper_area() for box in boxes) + +def part2(boxes: List[Box]) -> int: + return sum(box.ribbon_length() for box in boxes) + +if __name__ == '__main__': + with open('2/input') as f: + boxes = [Box.from_string(line.strip()) for line in f] + print(part1(boxes)) + print(part2(boxes))
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