From a7a80639220af7b8a401dc5402a0d844494bbc18 Mon Sep 17 00:00:00 2001 From: Gnarwhal Date: Thu, 17 Dec 2020 23:58:33 -0800 Subject: [PATCH] Completed day 18 --- 2020/days/day18.cpp | 128 ++++++++++++++ 2020/inputs/day18.input | 377 ++++++++++++++++++++++++++++++++++++++++ 2 files changed, 505 insertions(+) create mode 100644 2020/days/day18.cpp create mode 100644 2020/inputs/day18.input diff --git a/2020/days/day18.cpp b/2020/days/day18.cpp new file mode 100644 index 0000000..c459a7a --- /dev/null +++ b/2020/days/day18.cpp @@ -0,0 +1,128 @@ +/******************************************************************************* + * + * Copyright (c) 2020 Gnarwhal + * + * ----------------------------------------------------------------------------- + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files(the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions + * + * The above copyright notice and this permission notice shall be included in all + * copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + * + *******************************************************************************/ + +#include +#include +#include +#include + +#include "../misc/types.hpp" +#include "../misc/print.hpp" + +auto evaluate_part1(const std::string & equation, usize & index) -> u64 { + auto value = u64(0); + auto operation = 0; + while (equation[index] != ')') { + if ('0' <= equation[index] && equation[index] <= '9') { + auto end = index; + while ('0' <= equation[++end] && equation[end] <= '9'); + if (operation == 0) { + value += std::stoll(equation.substr(index, end - index)); + } else { + value *= std::stoll(equation.substr(index, end - index)); + } + index = end; + } else if (equation[index] == '+') { + operation = 0; + index += 2; + } else if (equation[index] == '*') { + operation = 1; + index += 2; + } else if (equation[index] == '(') { + if (operation == 0) { + value += evaluate_part1(equation, ++index); + } else { + value *= evaluate_part1(equation, ++index); + } + } else if (equation[index] == ' ') { + ++index; + } + } + ++index; + return value; +} + +auto evaluate_part2(const std::string & equation, usize & index) -> u64; +auto evaluate_part2_addition(const std::string & equation, usize & index) -> u64; +auto evaluate_part2_factor(const std::string & equation, usize & index) -> u64; + +auto evaluate_part2(const std::string & equation, usize & index) -> u64 { + auto value1 = evaluate_part2_addition(equation, index); + if (++index < equation.size() && equation[index] == '*') { + auto value2 = evaluate_part2(equation, index += 2); + return value1 * value2; + } + --index; + return value1; +} + +auto evaluate_part2_addition(const std::string & equation, usize & index) -> u64 { + auto value1 = evaluate_part2_factor(equation, index); + if (++index < equation.size() && equation[index] == '+') { + auto value2 = evaluate_part2_addition(equation, index += 2); + return value1 + value2; + } + --index; + return value1; +} + +auto evaluate_part2_factor(const std::string & equation, usize & index) -> u64 { + auto value = u64(0); + if (equation[index] == '(') { + value = evaluate_part2(equation, ++index); + ++index; + } else { + auto end = index; + while ('0' <= equation[++end] && equation[end] <= '9'); + value = std::stoll(equation.substr(index, end - index)); + index = end; + } + return value; +} + +auto day18() -> void { + auto equations = std::vector(); + { + auto line = std::string(); + auto file = std::ifstream("inputs/day18.input"); + while (getline(file, line)) { + equations.push_back(line + ')'); + } + } + auto sum = u64(0); + for (auto i = usize(0); i < equations.size(); ++i) { + auto index = usize(0); + sum += evaluate_part1(equations[i], index); + } + print(sum); + + sum = u64(0); + for (auto i = usize(0); i < equations.size(); ++i) { + auto index = usize(0); + sum += evaluate_part2_factor('(' + equations[i], index); + } + print(sum); +} diff --git a/2020/inputs/day18.input b/2020/inputs/day18.input new file mode 100644 index 0000000..ea3aedd --- /dev/null +++ b/2020/inputs/day18.input @@ -0,0 +1,377 @@ +9 * 8 + 2 + (4 * (2 * 2 + 9 * 2) * 9 * 3 * 8) + 8 * 5 +8 * (9 + 5 + 5 * 6 + 8 * 3) * 5 * 7 * 4 + 9 +(9 + (2 * 6 + 7 * 5)) * (7 + 7 * 5 + (6 + 2 + 6) * (7 * 8 * 8 + 9)) + 4 * 2 +((8 + 3 * 6 * 2) * 9 + 3) + 5 + 6 * 3 +6 * (9 + 6 * (7 + 4 + 2 + 5 + 6) * 7 + 3 * (5 * 8 * 6 + 6 * 7 * 8)) + (8 * 8 + 4) + (5 * (2 + 9) * 8) * 4 * 2 +(8 * 6 + 8) + 6 * 8 * (9 * (6 + 8 * 3 + 8) + (7 * 9 * 6 * 3) * 3 + 8 * 4) +3 * 4 * 8 * 7 + (4 + 5 + 8 * (3 + 3 + 3 * 6) + 4 + (3 * 8 * 8 * 6)) + (8 + 8 * (4 + 2 + 5 * 8 + 9)) +8 * ((2 + 8 * 8 * 2 + 3) * 8 + 7 * 4) * (5 + 6) + 4 * 7 +5 * (6 * 2 * 3 + 9) * (3 + 3 * (6 + 6 * 3) + 3 * 5 * 2) +5 * (7 + (2 * 7 * 2 * 6) * (9 * 7 + 8 * 7)) * 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