Google Kickstart Q1

#include <bits/stdc++.h>
using namespace std;

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    int t;
    cin >> t;
    for(int i = 1; i <= t; i++){
        long n, k;
        cin >> n >> k;
        string s;
        cin >> s;
        int c = 0;
        for(int j = 0; j < n/2; j++){
            if(s[j] == s[n-j-1]){
                c++;
            }
        }
        cout << "Case #" << i << ": " << abs(c-k) << "\n";
    }
    return 0;
}