oj.uz

Submission #642325

# Submission time Handle Problem Language Result Execution time Memory
642325 2022-09-19T08:41:37 Z berr Colors (BOI20_colors) C++17
0 / 100
 0 ms 208 KB 
#include <bits/stdc++.h>
using namespace std;
#define int long long
int l, r, ans, c;

void query(int x)
{
    cout<<"? "<<x<<endl;

    cin>>ans;
}


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

        l=max(1LL, n/3), r=l;

    query(l);
    int t=1;
  


    for(int i=31; i>=0; i--)
    {
		int pf=0;


        if(t%2==1)
        {
            if((1LL<<i)+r<=n)
                {
                    r+=(1LL<<i);
                    query(r);
                    if(ans==1)
                    {
                        pf=1;
                        t=0;
                        l+=min(r-l, 1LL<<i);
                    }
        
                }
                if(l-(1LL<<i)>0LL&&pf==0)
                {
                    l-=(1LL<<i);
                    query(l);
                    if(ans==1)
                    {
                        r-=min(r-l, (1LL<<i));
                    }
        
                }
        }
        else
        {
                 if(l-(1LL<<i)>0LL)
                {
                    l-=(1LL<<i);
                    query(l);
                    if(ans==1)
                    {
                        pf=1;
                        t=1;
                        r-=min(r-l, (1LL<<i));
                    }
        
                }
                            if((1LL<<i)+r<=n&&pf==0)
                {
                    r+=(1LL<<i);
                    query(r);
                    if(ans==1)
                    {
                        l+=min(r-l, 1LL<<i);
                    }
        
                }
        }

    }
      
    cout<<"= "<<abs(l-r)+1<<endl;



}

Subtask #1
0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 208 KB OK (5 queries)
2 Incorrect 0 ms 208 KB Wrong guess
3 Halted 0 ms 0 KB -

Subtask #2
0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 208 KB OK (5 queries)
2 Incorrect 0 ms 208 KB Wrong guess
3 Halted 0 ms 0 KB -

Subtask #3
0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 208 KB OK (5 queries)
2 Incorrect 0 ms 208 KB Wrong guess
3 Halted 0 ms 0 KB -

Subtask #4
0 / 24.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 208 KB OK (5 queries)
2 Incorrect 0 ms 208 KB Wrong guess
3 Halted 0 ms 0 KB -

Subtask #5
0 / 33.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 208 KB OK (5 queries)
2 Incorrect 0 ms 208 KB Wrong guess
3 Halted 0 ms 0 KB -