day5.cpp

#include <iostream>
#include <regex>
#include <string>
#include <fstream>
#include <vector>
#include <ctime>
#include <thread>

using namespace std;

// just to make things nicer for myself later
#define MATCH(str, reg) regex_search(str, reg)

//* PART 1 REGEXES *\\
regex vowels("([^aeiou]*[aeiou]+[^aeiou]*){3,}");
regex pairs(".*([a-zA-Z])\\1.*");
regex illegals(".*(ab|cd|pq|xy)+.*");

//* PART 2 REGEXES *\\ 
regex repeatedpair(".*([a-zA-Z]{2}).*\\1.*");
regex repwithsinglebetween(".*([a-zA-Z])(?:(?!\\1).)\\1.*");

// number of nice strings
int nice1 = 0; // part 2
int nice2 = 0; // part 1

clock_t start;

vector<string> strings;

void part1();
void part2();

int main() {

	cout << "Reading text file... ";
	fstream file("Day 5 Input.txt");
	string line;
	while (getline(file, line))
		strings.push_back(line);
	cout << "DONE" << endl;
	
	// start processing.
	start = clock();

	thread p1(part1);
	thread p2(part2);
	p1.join();
	p2.join();
	cout << "Total time multithreaded: " << clock() - start << "ms" << endl;

	system("pause");

	nice1 = 0;
	nice2 = 0;

	start = clock();
	part1();
	part2();

	cout << "Total time single threaded: " << clock() - start << "ms" << endl;

	system("pause"); // because visual studio
	return 0;
}

void part1() {
	for (auto s : strings) {
		if (MATCH(s, vowels) && MATCH(s, pairs) && !MATCH(s, illegals)) {
			nice1++;
		}
	}
	cout << "Part 1: " << nice1 << " nice strings. (took " << clock() - start << "ms)" << endl;
}

void part2() {
	for (auto s : strings) {
		if (MATCH(s, repeatedpair) && MATCH(s, repwithsinglebetween)) {
			nice2++;
		}
	}
	cout << "Part 2: " << nice2 << " nice strings. (took " << clock() - start << "ms)" << endl;
}