Day 7
This commit is contained in:
Tobias Radloff
parent
e254b9601b
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710fe3f3b2
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day07.py
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day07.py
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#!/usr/bin/env python
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# https://adventofcode.com/2025/day/7
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def read_input(filename: str = "day07input.txt") -> list[list[str]]:
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f = open(filename, "r")
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lines = [l.strip("\n") for l in f.readlines()]
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return [list(line) for line in lines]
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# for part 1 we're using a top-down approach
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def beam1(row: int, col: int) -> int:
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# make sure we're inside the field
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assert 0 <= row <= len(field) - 1
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assert 0 <= col <= len(field[0])
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split_count = 0
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while row < len(field):
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# continue down from starting position
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if field[row][col] == "S":
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row += 1
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# continue down through empty space
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elif field[row][col] == ".":
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field[row][col] = "|"
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row += 1
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# stop if we're hitting a previous beam
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elif field[row][col] == "|":
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break
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# split beam
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elif field[row][col] == "^":
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# print(f"splitting beam at {row=} and {col=}")
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split_count += 1
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# left beam
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if col > 0:
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split_count += beam1(row, col - 1)
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# right beam
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if col + 1 < len(field[0]):
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split_count += beam1(row, col + 1)
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# stop current beam
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break
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else:
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raise Exception(f"unknown character {field[row][col]} in position {row=} and {col=}!")
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return split_count
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# solving part 2 with a bottm-up approach b/c top-down runs in O(2^n)
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def beam2(_field: list[list[str]]) -> int:
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# count the number of paths from a specific position
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def count_paths(r: int, c: int) -> int:
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# return
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for k in range(r+1, len(_field)):
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# if we encounter a splitter, return its path count
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if isinstance(_field[k][c], int):
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return _field[k][c]
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elif _field[k][c] == "^":
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raise Exception(f"I missed a splitter at row={k} and col={c}!")
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# if we hit the edge there is only one path
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return 1
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# loop over all rows that can contain splitters
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for row in range(len(_field) - 2, 0, -2):
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# loop over columns in row
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for col in range(len(_field[row])):
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# if we encounter a splitter, replace it with the number of existing paths starting at its position
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if _field[row][col] == "^":
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field[row][col] = count_paths(row, col - 1) + count_paths(row, col + 1)
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# print final field
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for line in _field:
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print("".join([str(c) for c in line]))
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# return the first splitter's path count
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for c in _field[2]:
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if isinstance(c, int):
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return c
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# part 1
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field = read_input()
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#field = read_input("testinput.txt")
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row, col = 0, field[0].index("S")
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print(beam1(row, col))
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# print final field
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#for line in field:
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# print("".join(line))
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# part 2
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field = read_input()
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#field = read_input("testinput.txt")
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print(beam2(field))
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day07input.txt
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day07input.txt
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