func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     const string t =  RGB ;     int q;     cin >> q;     for (int i = 0; i < q; ++i) {       int n, k;       string s;       cin >> n >> k >> s;       int ans = 1e9;       for (int j = 0; j < n - k + 1; ++j) {         for (int offset = 0; offset < 3; ++offset) {           int cur = 0;           for (int pos = 0; pos < k; ++pos) {             if (s[j + pos] != t[(pos + offset) % 3]) {               ++cur;             }           }           ans = min(ans, cur);         }       }       cout << ans << endl;     }     return 0;   }   