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* 7) * 9 + ((9 + 9) + 6 + 3 + 8) * (9 + 9 * (6 + 9)) +((6 * 6 + 8 * 6) + 2 * (6 * 6) * (3 * 9 + 7 + 9 * 8) + 3) * (8 * (2 + 7 + 9 * 8) * 2) + 4 + 7 * 6 +7 * (7 * 3 * 9 + 7) + (4 * 9 + (5 + 3 + 5) * 7) + (5 + 3 * 3 + 2) * 2 +(6 * (2 * 7 * 3)) + 5 +8 * ((7 * 4 * 4 * 3) * 3 * 5 + 6 + (2 * 5 + 5 + 2 * 8) * 9) diff --git a/2020-python/solutions/day_18.py b/2020-python/solutions/day_18.py new file mode 100644 index 0000000..111302c --- /dev/null +++ b/2020-python/solutions/day_18.py @@ -0,0 +1,125 @@ +"""AOC 2020 Day 18""" + +import pathlib +import time + +TEST_INPUT = """1 + (2 * 3) + (4 * (5 + 6)) +2 * 3 + (4 * 5) +5 + (8 * 3 + 9 + 3 * 4 * 3) +5 * 9 * (7 * 3 * 3 + 9 * 3 + (8 + 6 * 4)) +((2 + 4 * 9) * (6 + 9 * 8 + 6) + 6) + 2 + 4 * 2""" + +def read_input(input_path: str) -> str: + """take input file path and return a str with the file's content""" + with open(input_path, 'r') as input_file: + input_data = input_file.read().strip() + return input_data + +def extract(input_data: str) -> list: + """take input data and return the appropriate data structure""" + return [exp.rstrip() for exp in input_data.split('\n')] + +def regular_op(stack: list, num: int) -> list: + """return the stack after performing a regular math operation""" + while stack: + if stack[-1] == '(': + break + operator, left_operand = stack[-1], stack[-2] + stack = stack[:-2] + if operator == '+': + num = left_operand + num + elif operator == '*': + num = left_operand * num + stack.append(num) + return stack + +def advanced_op(stack: list, num: int, sub_expr: bool) -> list: + """return the stack after performing an advanced math operation""" + if sub_expr: + index = -1 + for stack_index, value in enumerate(stack): + if value == '(': + index = stack_index + if index != -1: + target = stack[index+1:] + stack = stack[:index] + else: + target = stack + stack = [] + for value in target: + if value != '*': + num *= int(value) + while stack: + if stack[-1] in '(*': + break + operator, left_operand = stack[-1], stack[-2] + stack = stack[:-2] + if operator == '+': + num = left_operand + num + stack.append(num) + return stack + +def evaluate(expression: str, advance: bool = False) -> tuple: + """return the result of an expression evaluated with regular or advanced math operator precendece""" + stack = list() + index = 0 + while index < len(expression): + data = expression[index] + if data.isdigit(): + num = int(data) + if advance: + stack = advanced_op(stack, num, False) + else: + stack = regular_op(stack, num) + elif data in '*+(': + stack.append(data) + elif data == ')': + num = int(stack[-1]) + if advance: + stack = stack[:-1] + stack = advanced_op(stack, num, True) + else: + stack = stack[:-2] + stack = regular_op(stack, num) + index += 1 + if advance and len(stack) > 1: + stack = advanced_op(stack[:-1], int(stack[-1]), True) + return stack[0] + +def part1(entries: dict) -> int: + """part1 solver""" + result_sum = 0 + for expression in entries: + result_sum += evaluate(expression) + return result_sum + +def part2(entries: tuple) -> int: + """part2 solver""" + result_sum = 0 + for expression in entries: + result_sum += evaluate(expression, True) + return result_sum + +def test_input_day_18(): + """pytest testing function""" + entries = extract(TEST_INPUT) + assert part1(entries) == 26386 + assert part2(entries) == 693942 + +def test_bench_day_18(benchmark): + """pytest-benchmark function""" + benchmark(main) + +def main(): + """main function""" + input_path = str(pathlib.Path(__file__).resolve().parent.parent) + "/inputs/" + str(pathlib.Path(__file__).stem) + start_time = time.time() + input_data = read_input(input_path) + entries = extract(input_data) + 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() diff --git a/README.md b/README.md index 6c93768..7bb3a1d 100644 --- a/README.md +++ b/README.md @@ -27,3 +27,4 @@ | [Day 15](https://adventofcode.com/2020/day/15) | [4.463s](./2020-python/solutions/day_15.py) | [718.712ms](./2020-python/solutions/day_15.py) | | [Day 16](https://adventofcode.com/2020/day/16) | [11.108ms](./2020-python/solutions/day_16.py) | [2.903ms](./2020-python/solutions/day_16.py) | | [Day 17](https://adventofcode.com/2020/day/17) | [743.804ms](./2020-python/solutions/day_17.py) | [836.255ms](./2020-python/solutions/day_17.py) | +| [Day 18](https://adventofcode.com/2020/day/18) | [10.263ms](./2020-python/solutions/day_18.py) | [2.053ms](./2020-python/solutions/day_18.py) |