func_code_string: #include <bits/stdc++.h>   using namespace std;   int read() {     int res = 0, f = 1;     char c = getchar();     while (!isdigit(c) && c !=  - ) c = getchar();     if (c ==  - ) f = -1, c = getchar();     while (isdigit(c)) res = (res << 3) + (res << 1) + (c ^ 48), c = getchar();     return res * f;   }   const int maxn = 2e5 + 10;   int n, k, val[26];   char s[maxn];   int main() {     int T = read();     while (T--) {       n = read();       k = read();       int ans = 0;       scanf( %s , s + 1);       for (int i = 1; i <= k / 2; i++) {         memset(val, 0, sizeof(val));         for (int j = 0; j < n / k; j++) {           val[s[i + j * k] -  a ]++;           val[s[k - i + 1 + j * k] -  a ]++;         }         int tmp = 0;         for (int j = 0; j < 26; j++) tmp = max(tmp, val[j]);         ans += n / k * 2 - tmp;       }       if (k & 1) {         memset(val, 0, sizeof(val));         for (int j = 0; j < n / k; j++) {           val[s[k / 2 + 1 + j * k] -  a ]++;         }         int tmp = 0;         for (int j = 0; j < 26; j++) tmp = max(tmp, val[j]);         ans += n / k - tmp;       }       printf( %d n , ans);     }     return 0;   }   