Submission #675706

#	Time	Username	Problem	Language	Result	Execution time	Memory
675706		Alma	Rack (eJOI19_rack)	C++17	40 / 100	1 ms	320 KiB

rack

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

using ll = long long;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(NULL);
    
    ll n, k;
    cin >> n >> k;
    ll pos = 0, add = n;
    bool inv = false;
    
    for (int i = 0; i < n; i++) {
        add--;
        if (inv == false) {
            if ((k & (1 << i))) {
                inv = 1;
            } else {
                pos |= (1 << add);
            }
        } else {
            if ((k & (1 << i))) {
                pos |= (1 << add);
            } else {
                inv = 1;
            }
        }
    }

    ll mod = 1e9+7;
    cout << (pos+1) % mod << '\n';

    return 0;
}

• Subtask 1: 20 / 20
• Subtask 2: 20 / 20
• Subtask 3: 0 / 60