oj.uz

Submission #642295

# Submission time Handle Problem Language Result Execution time Memory
642295 2022-09-19T08:02:06 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=62; i>=0; i--)
    {
        if((1LL<<i)+r<=n&&t%2==1)
        {
            r+=(1LL<<i);
            query(r);
            if(ans==1)
            {
                l+=min(r-l-1, 1LL<<i);
            }
            t=0;
        }
        else if(l-(1LL<<i)>0)
        {

            l-=(1LL<<i);
           
            query(l);
            if(ans==1)
            {
                r-=min(r-l-1, (1LL<<i));
            }
            t=1;
        }
        else if(r+(1LL<<i)<=n)
        {
            r+=(1LL<<i);
            query(r);
            if(ans==1)
            {
                l+=min(r-l-1, 1LL<<i);
            }
            t=0;
        }
    }
    cout<<"= "<<abs(l-r)+1<<endl;



}

Subtask #1
0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 208 KB OK (4 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 (4 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 (4 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 (4 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 (4 queries)
2 Incorrect 0 ms 208 KB Wrong guess
3 Halted 0 ms 0 KB -