func_code_string: #include <bits/stdc++.h>   using namespace std;   int n, k, sum1, sum2;   string a;   int f[300011];   void solve() {     scanf( %d%d , &n, &k);     cin >> a;     memset(f, -1, sizeof(f));     for (int i = 0; i < n; i++) {       if (a[i] !=  ? ) {         if (f[i % k] == -1)           f[i % k] = a[i] -  0 ;         else if (f[i % k] != (int)(a[i] -  0 )) {           cout <<  NO  << endl;           return;         }       }     }     sum1 = sum2 = 0;     for (int i = 0; i < k; i++) {       sum1 += (f[i] == 0);       sum2 += (f[i] == 1);     }     if (sum1 > k / 2 || sum2 > k / 2)       cout <<  NO  << endl;     else       cout <<  YES  << endl;   }   int main() {     int T;     scanf( %d , &T);     while (T--) solve();     return 0;   }   