Submission #948973

#	Time	Username	Problem	Language	Result	Execution time	Memory
948973		LucaIlie	Colors (BOI20_colors)	C++17	0 / 100	0 ms	344 KiB

Colors

#include <bits/stdc++.h>

using namespace std;

const int C = 35;

int prv = 0;
bool query( long long c ) {
    cout << "? " << c << endl;
    bool ans = (abs( prv - c ) >= C);
    prv = c;
    cout << ans << endl;
    return ans;
}

/*bool query( long long c ) {
    cout << "? " << c << endl;
    bool ans;
    cin >> ans;
    return ans;
}*/

void answer( long long c ) {
    cout << "= " << c << endl;
}

int main() {
    long long n;

    cin >> n;

    query( n / 2 );
    int l = n - (1 << ((int)log2( n ))), c = 0;
    for ( int k = log2( n ); k >= 0; k-- ) {
        if ( c + (1 << k) >= n )
            continue;

        if ( l > n / 2 ) {
            l -= c + (1 << k);
            if ( !query( l ) )
                c += (1 << k);
        } else {
            l += c + (1 << k);
            if ( !query( l ) )
                c += (1 << k);
        }
    }

    answer( c + 1 );

    return 0;
}

• Subtask 1: 0 / 9
• Subtask 2: 0 / 13
• Subtask 3: 0 / 21
• Subtask 4: 0 / 24
• Subtask 5: 0 / 33