제출 #680505

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
680505		jhwest2	Colors (BOI20_colors)	C++17	0 / 100	0 ms	208 KiB

Colors

#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
ll n;

bool ask(ll n) {
    bool res; 
    cout << "? " << n << endl;
    cin >> res;
    return res;
}
int main() {
    cin >> n;

    ll L = 1, R = n;
    ll x = n / 3, dir = 0;
    ask(x);
    while (L < R) {
        ll M = (L + R + 1) / 2;

        bool r;
        if (dir == 0) {
            r = ask(x + M);
            x += M;
        }
        else {
            r = ask(x - M);
            x -= M;
        }
        dir = 1 - dir;
        
        if (r)
            R = M;
        else
            L = M + 1;
    }
    cout << "= " << L << endl;
}

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