Submission #940818

#	Time	Username	Problem	Language	Result	Execution time	Memory
940818		LucaIlie	Colors (BOI20_colors)	C++17	0 / 100	0 ms	344 KiB

Colors

#include <bits/stdc++.h>

using namespace std;

set<int> unused;
int query( long long c ) {
    unused.erase( c );
    cout << "? " << c << endl;
    int ans;
    cin >> ans;
    return ans;
}

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

int main() {
    long long n;

    cin >> n;

    for ( int i = 1; i <= 400; i++ )
        unused.insert( i );

    long long l = 0, r = n;
    while ( r - l > 1 ) {
        long long c = (l + r) / 2;

        int x = *unused.begin();
        query( x );
        if ( query( c + x ) )
            r = c;
        else
            l = c;
    }

    answer( r );

    return 0;
}

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