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#include <algorithm>
#include <cctype>
#include <filesystem>
#include <fstream>
#include <iostream>
#include <vector>
using namespace std;
namespace {
vector<vector<long>>
read_file(const filesystem::path& filename)
{
ifstream file{ filename };
vector<vector<long>> lines;
for ( string line; getline(file, line); ) {
vector<long> numbers;
for ( auto chr: line ) {
if ( isdigit(chr) ) {
numbers.emplace_back(chr - '0');
}
}
lines.emplace_back(std::move(numbers));
}
return lines;
}
void
part1(const vector<vector<long>>& lines)
{
long sum = 0;
for ( const auto& line: lines ) {
auto first = max_element(line.begin(), prev(line.end()));
auto second = max_element(next(first), line.end());
sum += *first * 10 + *second;
}
cout << "Part 1: " << sum << '\n';
}
} // namespace
int
main()
{
auto lines = read_file("data/day03.txt");
part1(lines);
}
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