Two string - C++ solution - memset, for loop, type conversion a[i] - 'a', and break statement

Twostring2.cpp

#include<iostream>
#include<cstdio>
#include<cstring>
#include<string>
#include<cctype>
#include<cstdlib>
#include<algorithm>
#include<bitset>
#include<vector>
#include<list>
#include<deque>
#include<queue>
#include<map>
#include<set>
#include<stack>
#include<cmath>
#include<sstream>
#include<fstream>
#include<iomanip>
#include<ctime>
#include<complex>
#include<functional>
#include<climits>
#include<cassert>
#include<iterator>
using namespace std;
int m[27];
int t;
string a;
string b;
int main(){
	cin >> t;
	while (t--){
		cin >> a >> b;
		for (int i = 0; i < a.size(); i++){
			m[a[i] - 'a']++;
		}
		bool ok = 0;
		for (int i = 0; i < b.size(); i++){
			if (m[b[i] - 'a']){
				ok = 1;
				break;
			}
		}
		if (ok){
			puts("YES");
		}
		else{
			puts("NO");
		}
		memset(m, 0, sizeof(m));
	}
	return 0;
}