Two string - C++ thinking in bitset, size_t, strong C++ knowledge

Twostring12.cpp

#include <cstdio>
#include <iostream>
#include <fstream>
#include <vector>
#include <list>
#include <map>
#include <set>
#include <queue>
#include <stack>
#include <bitset>
#include <algorithm>
#include <sstream>
#include <iomanip>
#include <cmath>
#include <cstdlib>
#include <cctype>
#include <cstring>
#include <string>
#include <ctime>
#include <cassert>
#include <utility>

using namespace std;

int T;
string A, B;
bitset<26> ba;

int main() {
//	freopen("date.in", "r", stdin);
//	freopen("date.out","w", stdout);
	cin.sync_with_stdio(false);
	
	cin >> T;
	while (T--) {
		cin >> A >> B;
		ba = 0;
		for (size_t i = 0; i < A.size(); i++) {
			ba[A[i] - 'a'] = 1;
		}
		bool ok = false;
		for (size_t i = 0; i < B.size() && !ok; i++) {
			if (ba[B[i] - 'a'] == 1) {
				ok = true;
			}
		}
		if (ok) {
			cout << "YES" << endl;
		}
		else {
			cout << "NO" << endl;
		}
	}
	
	return 0;
}