문제
풀이
#include <cmath>
#include <iostream>
#include <string>
using namespace std;
void solve(void) {
int n; cin >> n;
string s; cin >> s;
string t; cin >> t;
int a = 0, b = 0;
for (int i=0; i<n; i++) {
a += (s[i] == 'W') - (t[i] == 'W');
b += (s[i] != t[i]);
}
cout << (abs(a) + b) / 2 << "\n";
}
int main(void) {
ios::sync_with_stdio(false);
cin.tie(nullptr);
int t; cin >> t;
while (t--) solve();
return 0;
}