제출 #1280057

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1280057		dosts	Colors (BOI20_colors)	C++20	0 / 100	0 ms	428 KiB

Colors

#include <bits/stdc++.h>
#define int long long
#define vi vector<int>
#define pii pair<int,int> 
#define ff first
#define ss second
#define sp << " " << 
#define all(x) x.begin(),x.end()

using namespace std;

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

void guess(int x) {
    cout << "= " << x << endl;
    exit(0);
}
void solve() {
    int n;
    cin >> n;
    if (n <= 64) {
        int ptr = 1;
        int ptr2 = 64;
        int lst = -1;
        for (int i=1;i<=64;i++) {
            if (i%2) {
                int c = ask(ptr);
                if (!c && lst != -1) {
                    guess(lst-ptr+1);
                    return;
                }
                lst = ptr++;
            }else {
                int c = ask(ptr2);
                if (!c && lst!=-1) {
                    guess(ptr2-lst+1);
                    return;
                }
                lst = ptr2--;
            }
        }
    }
}

signed main() {
    ios_base::sync_with_stdio(0),cin.tie(0);
    #ifdef Dodi
        freopen("in.txt","r",stdin);
        freopen("out.txt","w",stdout);
    #endif
    int t = 1;
    //cin >> t;
    while (t --> 0) solve();
}

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