diff --git a/day18.py b/day18.py new file mode 100644 index 0000000..7499048 --- /dev/null +++ b/day18.py @@ -0,0 +1,57 @@ +import aoclib +import re + +DAY = 18 +TEST_SOLUTION_PART1 = 26457 +TEST_SOLUTION_PART2 = 694173 + +r_parentheses = re.compile(r'(\([^()]+\))') +r_calc = re.compile(r'^(\d+([*+])\d+)') +r_add = re.compile(r'[^+0-9]?(\d+\+\d+)') +r_mul = re.compile(r'[^*0-9]?(\d+\*\d+)') + + +def calculate(expression, add_pred=False): + while "(" in expression: + for parentheses in re.findall(r_parentheses, expression): + expression = expression.replace(parentheses, str(calculate(parentheses[1:-1], add_pred)), 1) + + if not add_pred: + while "+" in expression or "*" in expression: + calc = re.match(r_calc, expression)[0] + expression = expression.replace(calc, str(eval(calc)), 1) + else: + while "+" in expression: + for addition in re.findall(r_add, expression): + left, right = addition.split('+') + expression = re.sub( + "(^|[*+])%s($|[+*])" % addition.replace('+', '\+'), + "\g<1>%s\g<2>" % (int(left) + int(right)), + expression + ) + + while "*" in expression: + for multiplication in re.findall(r_mul, expression): + left, right = multiplication.split('*') + expression = re.sub( + "(^|[*+])%s($|[+*])" % multiplication.replace('*', '\*'), + "\g<1>%s\g<2>" % (int(left) * int(right)), + expression + ) + + return int(expression) + + +def part1(test_mode=False, add_pred=False): + my_input = aoclib.getInputAsArray(day=DAY, test=test_mode) + + result = 0 + for line in my_input: + line = line.replace(" ", "") + result += calculate(line, add_pred) + + return result + + +def part2(test_mode=False): + return part1(test_mode, add_pred=True) diff --git a/inputs/18 b/inputs/18 new file mode 100644 index 0000000..2cb9b51 --- /dev/null +++ b/inputs/18 @@ -0,0 +1,372 @@ +(7 * (3 + 8 + 8 + 7) + (6 + 8 * 2 + 5 + 2 * 6) * (5 + 2) * 9) + ((7 * 4 + 8) * 6 * 8 + 9) * 7 * 2 * 2 +6 * ((9 + 4) * (6 * 7 + 5 + 8 * 2)) +7 * 8 + 2 + 8 * (8 * 4) * (4 + 8) +(9 + 3 + 2 * 5 * 8) + 9 + 5 * 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