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Submission #649660

# Submission time Handle Problem Language Result Execution time Memory
649660 2022-10-11T08:02:09 Z DJeniUp Colors (BOI20_colors) C++17
0 / 100
 0 ms 208 KB 
#include "bits/stdc++.h"
//#pragma GCC optimize("O3")

using namespace std;

typedef long long ll;
typedef unsigned long long ull;
typedef pair<ll,ll>pairll;
typedef long double ld;

#define fr first
#define sc second
#define pb push_back
#define INF 100000000007
#define endl '\n'
#define MOD 998244353
#define A 31
#define N 500007

ll n;

int main(){
    
    cin>>n;
    if(n==1){
        cout<<"= "<<1<<endl;
        cout.flush();
        return 0;
    }
    ll a=1;
    ll b=1+n/4;
    ll c=b+(n+1)/2;
    ll d=n;
    ll f=0;
    ll f1=-1;
    ll l=1;
    ll r=n;
    cout<<"? "<<b<<endl;
    cout.flush();
    ll x;
    cin>>x;
    
    while(l<r){
        //cout<<a<<" "<<b<<" "<<c<<" "<<d<<endl;
        ll m1=(l+r)/2;
        if(f==-1){
            f=0;
            b=(c-m1+b)/2;
            cout<<"? "<<b<<endl;
            cout.flush();
            cin>>x;
            if(x==0){
                f1=-1;
                l=max(l,c-b+1);
            }else{
                f1=-1;
                r=min(r,c-b);
            }
        }else{
            f1=0;
            c=(c+b+m1)/2;
            cout<<"? "<<c<<endl;
            cout.flush();
            cin>>x;
            if(x==0){
                f=-1;
                l=max(l,c-b+1);
            }else{
                f=-1;
                r=min(r,c-b);
            }
        }
    }
    cout<<"= "<<l<<endl;
    cout.flush();
    
    return 0;
}

Compilation message

Colors.cpp: In function 'int main()':
Colors.cpp:30:8: warning: unused variable 'a' [-Wunused-variable]
   30 |     ll a=1;
      |        ^
Colors.cpp:33:8: warning: unused variable 'd' [-Wunused-variable]
   33 |     ll d=n;
      |        ^
Colors.cpp:35:8: warning: variable 'f1' set but not used [-Wunused-but-set-variable]
   35 |     ll f1=-1;
      |        ^~

Subtask #1
0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 208 KB OK (3 queries)
2 Runtime error 0 ms 208 KB Execution killed with signal 13
3 Halted 0 ms 0 KB -

Subtask #2
0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 208 KB OK (3 queries)
2 Runtime error 0 ms 208 KB Execution killed with signal 13
3 Halted 0 ms 0 KB -

Subtask #3
0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 208 KB OK (3 queries)
2 Runtime error 0 ms 208 KB Execution killed with signal 13
3 Halted 0 ms 0 KB -

Subtask #4
0 / 24.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 208 KB OK (3 queries)
2 Runtime error 0 ms 208 KB Execution killed with signal 13
3 Halted 0 ms 0 KB -

Subtask #5
0 / 33.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 208 KB OK (3 queries)
2 Runtime error 0 ms 208 KB Execution killed with signal 13
3 Halted 0 ms 0 KB -