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((3 * 7 * 3 + 4 * 5) * (6 + 8 + 9 * 7 + 6) * 9 + 5 * (5 + 4 + 4 + 4)) diff --git a/18/main.py b/18/main.py new file mode 100644 index 0000000..d603768 --- /dev/null +++ b/18/main.py @@ -0,0 +1,106 @@ +import re + +def getExpressions(filename): + with open(filename, "r") as f: + return f.read().splitlines() + +def findMatchingPosition(line: str, pos: int) -> int: + depth = 1 + end_pos = pos + while depth > 0: + end_pos += 1 + if line[end_pos] == "(": + depth += 1 + elif line[end_pos] == ")": + depth -= 1 + + return end_pos + +def findMatchingParenthesis(line: str) -> list[tuple[int, int]]: + parens = [] + for match in re.finditer(r"\(", line): + paren_start = match.start() + parent_end = findMatchingPosition(line, paren_start) + parens.append((paren_start, parent_end)) + return parens + +def determineTopParenthesis(parens: list[tuple[int, int]]) -> list[tuple[int, int]]: + top_parens = [] + for i in range(len(parens)): + is_top_paren = True + for j in range(len(parens)): + if i != j and parens[i][0] > parens[j][0] and parens[i][1] < parens[j][1]: + is_top_paren = False + break + + if is_top_paren: + top_parens.append(parens[i]) + return top_parens + +def evaluateExpression(expression: str): + parens = findMatchingParenthesis(expression) + top_parens = determineTopParenthesis(parens) + top_parens.sort(key=lambda p: p[0]) + + offset = 0 + for paren in top_parens: + paren_start = paren[0] - offset + paren_end = paren[1] - offset + sub_value = evaluateExpression(expression[paren_start+1:paren_end]) + expression = expression[:paren_start] + str(sub_value) + expression[paren_end+1:] + offset += (paren[1] - paren[0] - len(str(sub_value)) + 1) + + parts = re.findall(r"(\d+|[\*\+])", expression) + result = int(parts[0]) + for i in range(1, len(parts), 2): + if parts[i] == "*": + result *= int(parts[i+1]) + elif parts[i] == "+": + result += int(parts[i+1]) + + return result + +def evaluateAdvancedExpression(expression: str) -> int: + parens = findMatchingParenthesis(expression) + top_parens = determineTopParenthesis(parens) + top_parens.sort(key=lambda p: p[0]) + + offset = 0 + for paren in top_parens: + paren_start = paren[0] - offset + paren_end = paren[1] - offset + sub_value = evaluateAdvancedExpression(expression[paren_start+1:paren_end]) + expression = expression[:paren_start] + str(sub_value) + expression[paren_end+1:] + offset += (paren[1] - paren[0] - len(str(sub_value)) + 1) + + parts = re.findall(r"(\d+|[\*\+])", expression) + i = 1 + while i < len(parts): + if parts[i] == "+": + a = parts[i-1] + b = parts[i+1] + parts = parts[:i-1] + [int(a) + int(b)] + parts[i+2:] + i = -1 + i += 2 + + result = int(parts[0]) + for i in range(2, len(parts), 2): + result *= int(parts[i]) + + return result + +def part1(filename: str) -> int: + total = 0 + for expression in getExpressions(filename): + total += evaluateExpression(expression) + return total + +def part2(filename: str) -> int: + total = 0 + for expression in getExpressions(filename): + total += evaluateAdvancedExpression(expression) + return total + +if __name__ == "__main__": + print("Part 1: ", part1("input.txt")) + print("Part 2: ", part2("input.txt")) diff --git a/18/test.txt b/18/test.txt new file mode 100644 index 0000000..22cae7f --- /dev/null +++ b/18/test.txt @@ -0,0 +1 @@ +(9 + (5 + 2 + 2 * 4) * (7 + 7 * 5 * 3) + 7) + 2 + 4 * 2 + 3 * (8 + 5)