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#include <algorithm>
#include <fstream>
#include <iostream>
#include <regex>
#include <string>
#include <vector>
using namespace std;
auto
read_file(string_view filename)
{
fstream input{ filename };
vector<string> lines;
for ( string line; getline(input, line); ) {
lines.emplace_back(line);
}
return lines;
}
void
part1(const vector<string>& lines)
{
const regex re1("(.*[aeiou]){3}");
const regex re2("(.)\\1");
const regex re3("(ab|cd|pq|xy)");
auto count = count_if(begin(lines), end(lines), [&](auto line) {
return regex_search(line, re1) && regex_search(line, re2) && !regex_search(line, re3);
});
cout << count << endl;
}
void
part2(const vector<string>& lines)
{
const regex re1("(..).*\\1");
const regex re2("(.).\\1");
auto count = count_if(begin(lines), end(lines), [&](auto line) {
return regex_search(line, re1) && regex_search(line, re2);
});
cout << count << endl;
}
int
main()
{
auto puzzle = read_file("data/day05.txt");
part1(puzzle);
part2(puzzle);
}
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