func_code_string: #include  bits/stdc++.h    using namespace std;      #define ll long long   #define Rip_classic_loki_for_glorious_purpose ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL)      #pragma GCC target ( avx2 )   #pragma GCC optimization ( O3 )   #pragma GCC optimization ( unroll-loops )      // need for speed      int main()   {       Rip_classic_loki_for_glorious_purpose;         int t;       cin >> t;          while(t--){           int n,k,check;        cin >> n >> k;        int w = 0;     for(int i = 0;i < n;i++){      cout << (i ^ w) << endl;      cin >> check;      if(check == 1){       break;      }      w = i;     }       }       return 0;   }   