Submission #999704

#	Time	Username	Problem	Language	Result	Execution time	Memory
999704		vjudge1	Rack (eJOI19_rack)	C++17	40 / 100	0 ms	348 KiB

rack

#pragma GCC optimize("Ofast")
#include"bits/stdc++.h"

#define int long long

using namespace std;

const int md = 1e9 + 7;

signed main() {
    cin.tie(nullptr)->sync_with_stdio(false);

    int n, k;
    cin >> n >> k;

    k --;

    int r = 0;

    for (int i = 0; i < 64; i ++) {
        if (k & (1ll << i)) {
            (r += 1ll << (n - i - 1)) %= md;
        }
    }

    cout << (r + 1) % md << '\n';
}

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