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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. #define ll long long 
  4. int main() {
  5.     int t;
  6. cin>>t;
  7. while(t--){
  8.     //endl="\n"+flush()
  9.     int n;
  10.     cin>>n;
  11.     int idx=0;
  12.     int x;
  13.     for(int i=1;i<n;i++){
  14.         cout<<"? "<<i<<" "<<i+n<<endl;
  15.         cin>>x;
  16.         if(x){
  17.             idx=i;
  18.             break;
  19.         }
  20.     }
  21.     if(!idx){
  22.         cout<<"? "<<1<<" "<<n<<endl;
  23.         cin>>x;
  24.         if(x){
  25.             idx=1;
  26.         }
  27.     }
  28.     if(!idx){
  29.         cout<<"? "<<1<<" "<<2*n<<endl;
  30.         cin>>x;
  31.         if(x){
  32.             idx=1;
  33.         }
  34.     }
  35.     if(!idx){
  36.         idx=n+1;
  37.     }
  38.     cout<<"! "<<idx<<endl;
  39. }
  40.     return 0;
  41. }
Success #stdin #stdout 0.01s 5288KB
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https://ideone.com/rGSKAH
language:
C++14 (gcc 8.3)
created:
17 hours ago
visibility:
public

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