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  1. #include <bits/stdc++.h>
  2.  
  3. #define ios ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);
  4. #define ll long long
  5. #define mod 1000000007
  6. using namespace std;
  7.  
  8. string s;
  9.  
  10. void solve(int x,int y,int r){
  11.     if (x>y)swap(x,y);
  12.  
  13.     printf("? %d %d",x,y);
  14.     fflush(stdout);
  15.     cin>>s;
  16.     if (s!="x" and s!="y"){
  17.         exit(0);
  18.     }
  19.  
  20.     if (s=="x" and y-x==1){
  21.         printf("! %d",y);
  22.         fflush(stdout);
  23.         return;
  24.     }
  25.  
  26.     if (s=="x"){
  27.         r=1;
  28.         solve(x,x+1,r);
  29.     }
  30.     else{
  31.         r*=2;
  32.         solve(y,y+r,r);
  33.     }
  34. }
  35.  
  36. int main(){
  37.  
  38.     string s;
  39.     while(true){
  40.         cin>>s;
  41.         if (s!="start")return 0;
  42.  
  43.         printf("? 1 10");
  44.         fflush(stdout);
  45.         cin>>s;
  46.         if (s!="x" and s!="y")return 0;
  47.         if (s=="x"){
  48.             printf("! 1");
  49.             fflush(stdout);
  50.             continue;
  51.         }
  52.  
  53.         solve(1,2,1);
  54.     }
  55.     return 0;
  56. }
Success #stdin #stdout 0s 15240KB
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https://ideone.com/0nNlf7
language:
C++14 (gcc 8.3)
created:
5 years ago
visibility:
secret

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