Submission #1135140

#	Time	Username	Problem	Language	Result	Execution time	Memory
1135140		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;
    if(n <= 64) {
        ask(1);
        int l = 1, r = n, p = 0, c = - 1;
        while(l < r) {
            if(!p) {
                int u = ask(r);
                if(!u) {
                    break;
                }
                c = r - l;
                l += 1;
            }
            else {
                int u = ask(l);
                if(!u) {
                    break;
                }
                c = r - l;
                r -= 1;
            }
            p ^= 1;
        }
        if(c == - 1) {
            c = l;
        }
        cout << "= " << c;
    }
}

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