Submission #1134817

#	Time	Username	Problem	Language	Result	Execution time	Memory
1134817		lopkus	Colors (BOI20_colors)	C++20	0 / 100	0 ms	432 KiB

Colors

#include<bits/stdc++.h>

using namespace std;

int ask(int n) {
    cout << "? " << n;
    cout << endl;
    int x;
    cin >> x;
    return x;
}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    int n;
    cin >> n;
    int l = 1, r = n, c = - 1;
    while(l <= r) {
        int mid = (l + r) / 2;
        ask(1);
        int ok = ask(mid);
        if(ok) {
            r = mid - 1;
            c = mid;
        }
        else {
            l = mid + 1;
        }
    }
    cout << "= " << c;
}

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