Completed day 16
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2020/days/day16.cpp
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2020/days/day16.cpp
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/*******************************************************************************
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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 Rule { u64 r11; u64 r12; u64 r21; u64 r22; };
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auto read_ticket(std::vector<u64> & ticket, const std::string & line) -> void {
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auto start = usize(0);
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auto end = usize(0);
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while ((end = line.find(",", end + 1)) != std::string::npos) {
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ticket.push_back(std::stoll(line.substr(start, end - start)));
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start = end + 1;
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}
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end = line.size();
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ticket.push_back(std::stoll(line.substr(start, end - start)));
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}
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auto matches_rule(const Rule & rule, u64 field) -> bool {
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return (rule.r11 <= field && field <= rule.r12) || (rule.r21 <= field && field <= rule.r22);
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}
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auto remove_if_exists(std::vector<u64> & v, u64 search) -> bool {
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auto low = usize(0);
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auto high = v.size();
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while (low < high) {
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auto index = (low + high) / 2;
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if (v[index] == search) {
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v.erase(v.begin() + index);
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return true;
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} else if (search > v[index]) {
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low = index + 1;
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} else {
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high = index;
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}
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}
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return false;
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}
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auto contains(std::vector<u64> & v, u64 search) -> bool {
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auto low = usize(0);
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auto high = v.size();
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while (low < high) {
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auto index = (low + high) / 2;
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if (v[index] == search) {
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return true;
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} else if (search > v[index]) {
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low = index + 1;
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} else {
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high = index;
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}
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}
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return false;
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}
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auto day16() -> void {
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auto find = std::vector<u64>();
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auto rules = std::vector<Rule>();
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auto your_ticket = std::vector<u64>();
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auto tickets = std::vector<std::vector<u64>>();
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{
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auto line = std::string();
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auto file = std::ifstream("inputs/day16.input");
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auto index = usize(0);
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while (getline(file, line) && line != "") {
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auto rule = Rule();
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auto start = line.find(":") + 2;
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auto end = line.find("-");
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rule.r11 = std::stoll(line.substr(start, end - start));
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start = end + 1;
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end = line.find(" ", end);
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rule.r12 = std::stoll(line.substr(start, end - start));
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start = end + 4;
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end = line.find("-", end);
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rule.r21 = std::stoll(line.substr(start, end - start));
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start = end + 1;
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end = line.size();
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rule.r22 = std::stoll(line.substr(start, end - start));
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rules.push_back(rule);
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if (line.find("departure") != std::string::npos) {
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find.push_back(index);
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}
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++index;
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}
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getline(file, line);
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getline(file, line);
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read_ticket(your_ticket, line);
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getline(file, line);
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getline(file, line);
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while (getline(file, line)) {
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auto ticket = std::vector<u64>();
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read_ticket(ticket, line);
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tickets.push_back(std::move(ticket));
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}
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}
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auto valid = std::vector<std::vector<u64>>();
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{
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auto foo = std::vector<u64>(your_ticket.size());
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for (auto i = usize(0); i < your_ticket.size(); ++i) {
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foo[i] = i;
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}
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for (auto i = usize(0); i < rules.size(); ++i) {
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valid.push_back(foo);
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}
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}
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auto sum = u64(0);
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for (auto k = usize(0); k < tickets.size(); ++k) {
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const auto & ticket = tickets[k];
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auto invalid_ticket = false;
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for (auto i = usize(0); i < ticket.size(); ++i) {
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auto invalid_field = true;
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for (auto j = usize(0); invalid_field && j < rules.size(); ++j) {
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if (matches_rule(rules[j], ticket[i])) {
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invalid_field = false;
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}
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}
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if (invalid_field) {
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sum += ticket[i];
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}
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invalid_ticket = invalid_ticket || invalid_field;
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}
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if (invalid_ticket) {
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tickets.erase(tickets.begin() + k);
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--k;
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}
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}
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print(sum);
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for (auto i = usize(0); i < tickets.size(); ++i) {
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const auto & ticket = tickets[i];
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for (auto j = usize(0); j < valid.size(); ++j) {
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auto & v = valid[j];
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for (auto k = usize(0); k < v.size(); ++k) {
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if (!matches_rule(rules[j], ticket[v[k]])) {
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v.erase(v.begin() + k);
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--k;
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}
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}
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}
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}
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for (auto i = usize(0); i < your_ticket.size(); ++i) {
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auto cont_index = usize(0);
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auto contained = usize(0);
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for (auto j = usize(0); j < valid.size(); ++j) {
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if (contains(valid[j], i)) {
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cont_index = j;
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++contained;
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}
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}
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if (contained == 1) {
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for (auto j = usize(0); j < valid[cont_index].size(); ++j) {
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if (valid[cont_index][j] != i) {
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valid[cont_index].erase(valid[cont_index].begin() + j);
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--j;
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}
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}
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}
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}
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auto loop = true;
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while (loop) {
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loop = false;
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for (auto i = usize(0); i < valid.size(); ++i) {
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if (valid[i].size() == 1) {
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for (auto j = usize(0); j < valid.size(); ++j) {
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if (j != i) {
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auto temp = remove_if_exists(valid[j], valid[i][0]);
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loop = temp || loop;
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}
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}
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}
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}
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}
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auto product = u64(1);
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for (auto i = usize(0); i < find.size(); ++i) {
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product *= your_ticket[valid[find[i]][0]];
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}
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print(product);
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}
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