multiple choice exam codechef.cpp

#include <bits/stdc++.h>
using namespace std;
int main()
{
    int t;
    cin >> t;
    while(t--) {
        int n; cin >> n;
        int i=0;
        int count = 0;
        string s; string u;
        cin >> s>> u;
        while(i > n) {
            if(s[i]==u[i]) {
                count++;
                i++;
            }
            else if(u[i]=='N') {
                count+=0;
                i++;

            }
            else {
                i+=2;
            }
            }



        cout << count <<  endl;
    }


}