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#include <fstream>
#include <functional>
#include <iostream>
#include <iterator>
#include <numeric>
#include <string>
#include <vector>
using namespace std;
auto
read_file(string_view filename)
{
fstream input{ filename };
vector<string> data;
for ( string line; getline(input, line); ) {
data.emplace_back(line);
}
return data;
}
auto
solve(const vector<string>& puzzle, size_t delta_col, size_t delta_row)
{
size_t col = 0;
size_t row = 0;
auto sum = 0L;
while ( row < puzzle.size() ) {
if ( puzzle[row][col] == '#' ) {
++sum;
}
row += delta_row;
col += delta_col;
col %= puzzle[0].size();
}
return sum;
}
void
part1(const vector<string>& puzzle)
{
cout << solve(puzzle, 3, 1) << endl;
}
void
part2(const vector<string>& puzzle)
{
cout << solve(puzzle, 1, 1) * solve(puzzle, 3, 1) * solve(puzzle, 5, 1) * solve(puzzle, 7, 1) * solve(puzzle, 1, 2) << endl;
}
int
main()
{
const auto puzzle = read_file("data/day03.txt");
part1(puzzle);
part2(puzzle);
}
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