122 lines
3.3 KiB
C++
122 lines
3.3 KiB
C++
/*
|
|
* <Short Description>
|
|
* Copyright (C) 2024 Brett Terpstra
|
|
*
|
|
* This program is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <https://www.gnu.org/licenses/>.
|
|
*/
|
|
#include <days.h>
|
|
#include <vector>
|
|
#include <limits>
|
|
#include <algorithm>
|
|
#include <blt/fs/loader.h>
|
|
#include <blt/iterator/enumerate.h>
|
|
#include <blt/iterator/iterator.h>
|
|
#include <blt/iterator/zip.h>
|
|
#include <blt/std/hashmap.h>
|
|
|
|
blt::hashmap_t<int, blt::hashset_t<int>> after;
|
|
std::vector<std::vector<int>> page_updates;
|
|
|
|
std::vector<std::vector<int>> correct_pages;
|
|
std::vector<std::vector<int>> incorrect_pages;
|
|
|
|
bool is_correct(const std::vector<int>& page)
|
|
{
|
|
for (const auto& [i, v] : blt::enumerate(page))
|
|
{
|
|
auto cant_be_after = after[v];
|
|
for (auto v2 : blt::iterate(page).skip(i))
|
|
{
|
|
if (cant_be_after.contains(v2))
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
void correct(std::vector<int>& page)
|
|
{
|
|
std::vector<int> copy = page;
|
|
for (const auto& [i, v] : blt::enumerate(page))
|
|
{
|
|
auto cant_be_after = after[v];
|
|
for (auto v2 : blt::iterate(page).skip(i))
|
|
{
|
|
if (cant_be_after.contains(v2))
|
|
{
|
|
copy.erase(std::find(copy.begin(), copy.end(), v2));
|
|
copy.insert(copy.begin() + static_cast<blt::ptrdiff_t>(i), v2);
|
|
}
|
|
}
|
|
}
|
|
// for (const auto& v : copy)
|
|
// std::cout << v << ", ";
|
|
// std::cout << "\n";
|
|
page = copy;
|
|
}
|
|
|
|
void run_day5()
|
|
{
|
|
auto file = blt::fs::getLinesFromFile("../problems/day5/input");
|
|
|
|
auto it = file.begin();
|
|
while (!it->empty())
|
|
{
|
|
if (blt::string::contains(*it, ','))
|
|
break;
|
|
auto line = blt::string::split(*it, '|');
|
|
after[std::stoi(line[1])].insert(std::stoi(line[0]));
|
|
++it;
|
|
}
|
|
|
|
for (; it != file.end(); ++it)
|
|
{
|
|
auto line = blt::string::split(*it, ',');
|
|
page_updates.emplace_back();
|
|
for (const auto& v : line)
|
|
page_updates.back().emplace_back(std::stoi(v));
|
|
}
|
|
|
|
for (const auto& pages : page_updates)
|
|
{
|
|
if (is_correct(pages))
|
|
correct_pages.push_back(pages);
|
|
else
|
|
incorrect_pages.push_back(pages);
|
|
}
|
|
|
|
BLT_TRACE("Correct pages %ld", correct_pages.size());
|
|
|
|
int count = 0;
|
|
|
|
for (const auto& page : correct_pages)
|
|
{
|
|
count += page[(page.size() / 2)];
|
|
}
|
|
|
|
int count2 = 0;
|
|
|
|
for (auto& page : incorrect_pages)
|
|
{
|
|
for (int i = 0; i < page.size(); i++)
|
|
correct(page);
|
|
BLT_TRACE(is_correct(page) ? "True" : "False");
|
|
count2 += page[(page.size() / 2)];
|
|
}
|
|
|
|
|
|
BLT_TRACE("Total midpoint correct %d", count);
|
|
BLT_TRACE("Total midpoint correct (corrected) %d", count2);
|
|
}
|