func_code_string: #include <bits/stdc++.h>   inline int read() {     int f = 1, x = 0;     char ch = getchar();     while (!(ch >=  0  && ch <=  9 )) {       if (ch ==  - ) f *= -1;       ch = getchar();     }     while (ch >=  0  && ch <=  9 ) {       x = x * 10 + ch -  0 ;       ch = getchar();     }     return f * x;   }   int q, n, k, ans, f[200000 + 1], p[200000 + 1], v[3];   char s[200000 + 1];   int main() {     q = read();     while (q--) {       n = read(), k = read();       scanf( %s , s + 1);       for (int i = 1; i <= n; i++) {         if (s[i] ==  R )           f[i] = 2;         else if (s[i] ==  G )           f[i] = 1;         else           f[i] = 0;         p[i] = (f[i] + i) % 3;       }       for (int i = 1; i < k; i++) v[p[i]]++;       ans = 2147483647;       for (int i = k; i <= n; i++) {         v[p[i]]++;         for (int j = 0; j <= 2; j++) ans = std::min(ans, k - v[j]);         v[p[i - k + 1]]--;       }       for (int i = n - k + 2; i <= n; i++) v[p[i]]--;       printf( %d n , ans);     }   }   