Submission #448756

#	Time	Username	Problem	Language	Result	Execution time	Memory
448756		UltraFalcon	Rack (eJOI19_rack)	C++17	40 / 100	1 ms	236 KiB

rack

#include <bits/stdc++.h>
#define int long long

using namespace std;

signed main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);

    const int limit = (1e9) + 7;

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

    k--;
    int i = n-1;
    int r = 1;

    while (i >= 0) {
        if (k % 2 == 1) {
            assert(i < 60);
            r = (r + ((1 << i) % limit)) % limit;
        }
        k /= 2;
        i--;
    }
    cout << r % limit << "\n";
}

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