DNA sequence

#include <iostream>
#include <vector>
#include <cstdio>
#include <string>
#include <set>

int main()
{
	std::string s;
	std::cin >> s;
	int n = s.size();
	int q;
	std::cin >> q;

	std::set<std::string> subs;
	for (int k = 1; k <= 10; ++k) {
		for (int i = 0; i < (n-k); ++i) {
			subs.insert(s.substr(i, k));
		}
	}

	for (int i = 0; i < q; ++i) {
		std::string r;
		std::cin >> r;
		if (subs.find(r) != subs.end()) {
			std::cout << "YES" << std::endl;
		}
		else {
			std::cout << "NO" << std::endl;
		}
	}
}

Test 1

Verdict: ACCEPTED