func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int q, n, k;     string s;     cin >> q;     while (q--) {       cin >> n >> k >> s;       string rgb =  RGB ;       int cnt = 0, ans = k;       for (int i = 0; i <= n - k; i++) {         for (int j = 0; j < 3; j++) {           cnt = 0;           for (int m = 0; m < k; m++)             if (s[i + m] != rgb[(j + m) % 3]) cnt++;           if (cnt < ans) ans = cnt;         }       }       cout << ans << endl;     }     return 0;   }   