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#include <filesystem>
#include <fstream>
#include <iostream>
#include <string>
#include <vector>
using namespace std;
namespace {
vector<string>
read_file(const filesystem::path& filename)
{
ifstream file{ filename };
vector<string> lines;
for ( string line; getline(file, line); ) {
lines.emplace_back(line);
}
return lines;
}
void
part1(const vector<string>& lines)
{
auto zeros = 0;
auto pos = 50;
for ( const auto& line: lines ) {
auto value = stoi(line.substr(1));
value %= 100;
pos += (line[0] == 'L') ? (100 - value) : value;
if ( pos % 100 == 0 ) {
++zeros;
}
}
cout << "Part 1: " << zeros << '\n';
}
void
part2(const vector<string>& lines)
{
auto zeros = 0;
auto pos = 50;
for ( const auto& line: lines ) {
auto value = stoi(line.substr(1));
while ( value-- > 0 ) {
pos += (line[0] == 'L') ? 99 : 1;
if ( pos % 100 == 0 ) {
++zeros;
}
}
}
cout << "Part 2: " << zeros << '\n';
}
} // namespace
int
main()
{
auto data = read_file("data/day01.txt");
part1(data);
part2(data);
}
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