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#include <filesystem>
#include <fstream>
#include <iostream>
#include <tuple>
#include <vector>
using namespace std;
namespace {
using Pos = tuple<long, long>;
vector<Pos>
read_file(const filesystem::path& filename)
{
ifstream file{ filename };
vector<Pos> data;
long x{};
long y{};
char skip{};
while ( file >> x >> skip >> y ) {
data.emplace_back(x, y);
}
return data;
}
void
part1(const vector<Pos>& data)
{
auto area = numeric_limits<long>::min();
for ( size_t i = 0; i != data.size(); ++i ) {
for ( size_t j = i + 1; j != data.size(); ++j ) {
const auto [x1, y1] = data[i];
const auto [x2, y2] = data[j];
const auto width = abs(x1 - x2) + 1;
const auto height = abs(y1 - y2) + 1;
area = max(area, width * height);
}
}
cout << "Part 1: " << area << '\n';
}
} // namespace
int
main()
{
auto data = read_file("data/day09.txt");
part1(data);
}
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