104 lines
3.5 KiB
C++
104 lines
3.5 KiB
C++
/*******************************************************************************
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*
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* Copyright (c) 2020 Gnarwhal
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*
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* -----------------------------------------------------------------------------
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files(the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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*******************************************************************************/
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#include <vector>
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#include <string>
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#include <iostream>
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#include <fstream>
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#include "../misc/types.hpp"
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#include "../misc/print.hpp"
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struct Instruction{ char op; i32 num; };
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auto day12() -> void {
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auto instructions = std::vector<Instruction>();
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{
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auto line = std::string();
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auto file = std::ifstream("inputs/day12.input");
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while (getline(file, line)) {
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instructions.push_back({ line[0], std::stoi(line.substr(1, line.size() - 1)) });
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if (line[0] == 'L' || line[0] == 'R') {
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instructions[instructions.size() - 1].num /= 90;
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}
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}
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}
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{
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auto ship_x = i32(0);
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auto ship_y = i32(0);
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auto direction = i32(2);
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for (const auto & instruction : instructions) {
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switch (instruction.op) {
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case 'N': ship_y += instruction.num; break;
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case 'E': ship_x += instruction.num; break;
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case 'S': ship_y -= instruction.num; break;
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case 'W': ship_x -= instruction.num; break;
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case 'R': direction = (direction - instruction.num + 4) % 4; break;
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case 'L': direction = (direction + instruction.num ) % 4; break;
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case 'F':
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ship_x += ((direction - 1) % 2) * instruction.num;
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ship_y += ((direction - 2) % 2) * instruction.num;
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break;
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}
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}
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print((std::abs(ship_x) + std::abs(ship_y)));
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}
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{
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auto ship_x = i32(0);
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auto ship_y = i32(0);
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auto waypoint_x = i32(10);
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auto waypoint_y = i32( 1);
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for (const auto & instruction : instructions) {
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switch (instruction.op) {
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case 'N': waypoint_y += instruction.num; break;
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case 'E': waypoint_x += instruction.num; break;
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case 'S': waypoint_y -= instruction.num; break;
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case 'W': waypoint_x -= instruction.num; break;
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case 'R':
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for (auto i = i32(0); i < instruction.num; ++i) {
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auto copy = waypoint_x;
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waypoint_x = waypoint_y;
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waypoint_y = -copy;
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}
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break;
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case 'L':
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for (auto i = i32(0); i < instruction.num; ++i) {
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auto copy = waypoint_x;
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waypoint_x = -waypoint_y;
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waypoint_y = copy;
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}
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break;
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case 'F':
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ship_x += waypoint_x * instruction.num;
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ship_y += waypoint_y * instruction.num;
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break;
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}
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}
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print((std::abs(ship_x) + std::abs(ship_y)));
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}
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}
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