Submission #1114538

#	Time	Username	Problem	Language	Result	Execution time	Memory
1114538		SalihSahin	Mađioničar (COI22_madionicar)	C++14	100 / 100	3812 ms	336 KiB

Main

#include <bits/stdc++.h>
#define pb push_back
#define int long long
using namespace std;
 
const int inf = 1e15 + 10;
const int N = 3e5 + 5;

bool query(int l, int r){
   cout<<"? "<<l<<" "<<r<<"\n";
   cout.flush();

   bool pal;
   cin>>pal;
   return pal;
}

int32_t main(){
   ios_base::sync_with_stdio(false);
   cin.tie(0); cout.tie(0);
   int n;
   cin>>n;

   int oddmx = 1, evenmx = 0;
   for(int i = 1; i <= n; i++){
      int st = oddmx + 2;

      for(int len = st; len <= n; len += 2){
         int l = i - (len - 1)/2, r = i + (len - 1)/2;
         if(l < 1 || r > n) break;
         bool pal = query(l, r);
         if(!pal) break;
         oddmx = len;
      }
   }

   for(int i = 1; i <= n; i++){
      int st = max(oddmx + 1, evenmx + 2);

      for(int len = st; len <= n; len += 2){
         int l = i - len/2 + 1, r = i + len/2;
         if(l < 1 || r > n) break;
         bool pal = query(l, r);
         if(!pal) break;
         evenmx = len;
      }
   }

   int ans = max(oddmx, evenmx);
   cout<<"! "<<ans<<endl;
   cout.flush();
   return 0;
}

• Subtask 1: 13 / 13
• Subtask 2: 25 / 25
• Subtask 3: 25 / 25
• Subtask 4: 37 / 37