func_code_string: #include  bits/stdc++.h    using namespace std;   #define int  long long   #define yes  YES n    #define no  NO n    const int M = 1000000007;      signed main(){       ios_base::sync_with_stdio(0);cin.tie(0);       int T;       cin >> T;       //T = 1;       while(T--){               int n, k;               cin >> n >> k;               int r;               cout << 0 << endl;               cin >> r;               if(r!=1){                   for(int i = 1;i <= n-1;i++){                       cout << (i^(i-1)) << endl;                       cin >> r;                       if(r==1)                           break;                   }               }       }       return 0;   }         