Advent of Code - Year 2025 - Day 7

aoc_2025_7.py

# https://adventofcode.com/2025/day/7
# Jahus


def split_it(input):
    _source = (None, None)
    _split_count = 0
    _result = input.copy()

    for l in range(len(_result)):

        _new_line = [c for c in _result[l]]

        for p in range(len(_result[l])):

            if _result[l][p] == "S":
                _source = (l, p)
                _new_line[p] = 'S'

            elif _result[l][p] == "." and _result[l-1][p] in ['|', 'S']:
                _new_line[p] = '|'

            elif _result[l][p] == "^" and _result[l-1][p] in ['|', 'S']:
                _new_line[p] = "^"
                try:
                    _new_line[p-1] = "|"
                except IndexError:
                    pass  # out of bounds
                try:
                    _new_line[p+1] = "|"
                except IndexError:
                    pass  # out of bounds
                _split_count += 1

            else:
                pass

        try:
            _result[l] = ''.join(_new_line)
        except IndexError:
            pass  # out of range

    return _result, _split_count, _source

def check_result(correct, user):
    try:
        for l in range(len(correct)):
            for c in range(len(correct[l])):
                if correct[l][c].strip().lower() != user[l][c].strip().lower():
                    print(l, c)
                    raise
    except:
        return False
    return True


if __name__ == "__main__":

    _in = [
        ".......S.......",
        "...............",
        ".......^.......",
        "...............",
        "......^.^......",
        "...............",
        ".....^.^.^.....",
        "...............",
        "....^.^...^....",
        "...............",
        "...^.^...^.^...",
        "...............",
        "..^...^.....^..",
        "...............",
        ".^.^.^.^.^...^.",
        "..............."
    ]

    _correct_result = [
        ".......S.......",
        ".......|.......",
        "......|^|......",
        "......|.|......",
        ".....|^|^|.....",
        ".....|.|.|.....",
        "....|^|^|^|....",
        "....|.|.|.|....",
        "...|^|^|||^|...",
        "...|.|.|||.|...",
        "..|^|^|||^|^|..",
        "..|.|.|||.|.|..",
        ".|^|||^||.||^|.",
        ".|.|||.||.||.|.",
        "|^|^|^|^|^|||^|",
        "|.|.|.|.|.|||.|"
    ]

    _user_result = split_it(_in)
    print(f"Source detected at ({_user_result[2][0]}, {_user_result[2][1]}).\nResult:\n{'\n'.join(_user_result[0])}\n\nSplit count: {_user_result[1]}")
    print('\nCorrect !' if check_result(_correct_result, _user_result[0]) else 'Faux !')