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100644 index 0000000..07bcb83 --- /dev/null +++ b/2020/solutions/day_3.py @@ -0,0 +1,59 @@ +"""AOC Day 3""" + +import pathlib +import time + +def read_input(input_path: str) -> list: + """take input file path and return appropriate data structure""" + with open(input_path, 'r') as input_file: + lines = list() + for line in input_file.readlines(): + lines.append(line.strip()) + return lines + + +def slope_tree_check(lines: list, dx: int, dy: int) -> int: + """check how many trees would be encountered with a specific slope""" + x_pos = 0 + y_pos = 0 + trees_encountered = 0 + line_length = len(lines[0]) + while y_pos < len(lines): + if lines[y_pos][x_pos] == '#': + trees_encountered += 1 + x_pos = (x_pos + dx) % line_length + y_pos += dy + return trees_encountered + +def part1(entries: list) -> int: + """part1 solver take a list of strings and return an int""" + return slope_tree_check(entries, 3, 1) + + +def part2(entries: list) -> int: + """part2 solver take a list of tuples and return an int""" + slopes = [ + (1, 1), + (3, 1), + (5, 1), + (7, 1), + (1, 2), + ] + prod = 1 + for slope in slopes: + prod *= slope_tree_check(entries, slope[0], slope[1]) + return prod + +def main(): + """main function""" + input_path = str(pathlib.Path(__file__).resolve().parent.parent) + "/inputs/" + str(pathlib.Path(__file__).stem) + entries = read_input(input_path) + start_time = time.time() + print("Part 1: %d" % part1(entries)) + print("Part 2: %d" % part2(entries)) + end_time = time.time() + print("Execution time: %f" % (end_time-start_time)) + + +if __name__ == "__main__": + main()