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Submission #1051850

# Submission time Handle Problem Language Result Execution time Memory
1051850 2024-08-10T10:12:40 Z matere Colors (BOI20_colors) C++14
0 / 100
 0 ms 344 KB 
#include<bits/stdc++.h>
using namespace std;
int main(){
    long long n,resp;
    cin>>n;
    if(n<=64){
        int cur=1;
        cout<<"? "<<1<<endl;
        cin>>resp;
        for(int i=0;i<(n+1)/2;i++){
            cur=n-cur+1;
            cout<<"? "<<cur<<endl;
            cin>>resp;
            if(resp==0){
                cout<<"= "<<n-i*2<<endl;
                return 0;
            }
            cur=n-cur+2;
            cout<<"? "<<cur<<endl;
            cin>>resp;
            if(resp==0){
                cout<<"= "<<n-i*2-1<<endl;
                return 0;
            }
        }
    }
    long long l=1,r=n;
    long long centr=(n+1)/2;
    while(l+l%2+2<r-r%2){
        long long mid=(l+r)/2;
        if(mid%2==1) mid--;
        cout<<"? "<<centr-mid/2<<endl;
        cin>>resp;
        cout<<"? "<<centr+mid/2<<endl;
        cin>>resp;
        if(resp==1){
            r=mid;
        }
        else{
            l=mid+1;
        }
    }
    // cout<<l<<' '<<r<<endl;
    long long r1,r2,r3,r4;
    cout<<"? "<<centr+(l+3)/2<<endl;
    cin>>r1;
    cout<<"? "<<centr-(l+3)/2<<endl;
    cin>>r2;
    cout<<"? "<<centr+(l+1)/2<<endl;
    cin>>r3;
    cout<<"? "<<centr-(l+1)/2<<endl;
    cin>>r4;
    if(r2==0) cout<<"= "<<r<<endl;
    else if(r3==0) cout<<"= "<<r-1<<endl;
    else if(r4==0) cout<<"= "<<r-2<<endl;
    else cout<<"= "<<r-3<<endl;
}

Subtask #1
0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB OK (5 queries)
2 Correct 0 ms 344 KB OK (6 queries)
3 Correct 0 ms 344 KB OK (10 queries)
4 Incorrect 0 ms 344 KB Hair color 14 was used multiple times
5 Halted 0 ms 0 KB -

Subtask #2
0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB OK (5 queries)
2 Correct 0 ms 344 KB OK (6 queries)
3 Correct 0 ms 344 KB OK (10 queries)
4 Incorrect 0 ms 344 KB Hair color 14 was used multiple times
5 Halted 0 ms 0 KB -

Subtask #3
0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB OK (5 queries)
2 Correct 0 ms 344 KB OK (6 queries)
3 Correct 0 ms 344 KB OK (10 queries)
4 Incorrect 0 ms 344 KB Hair color 14 was used multiple times
5 Halted 0 ms 0 KB -

Subtask #4
0 / 24.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB OK (5 queries)
2 Correct 0 ms 344 KB OK (6 queries)
3 Correct 0 ms 344 KB OK (10 queries)
4 Incorrect 0 ms 344 KB Hair color 14 was used multiple times
5 Halted 0 ms 0 KB -

Subtask #5
0 / 33.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB OK (5 queries)
2 Correct 0 ms 344 KB OK (6 queries)
3 Correct 0 ms 344 KB OK (10 queries)
4 Incorrect 0 ms 344 KB Hair color 14 was used multiple times
5 Halted 0 ms 0 KB -