Submission #645384

#	Time	Username	Problem	Language	Result	Execution time	Memory
645384		1zaid1	Rack (eJOI19_rack)	C++17	100 / 100	17 ms	16008 KiB

rack

#include <bits/stdc++.h>
using namespace std;
#define int long long
#define endl '\n';

const int M = 2e6+5, MOD = 1e9+7;
int p[M];

signed main() {
    cin.tie(0)->sync_with_stdio(0);
    p[0] = 1;
    for (int i = 1; i < M; i++) p[i] = (p[i-1]*2)%MOD;
    
    int n, k;
    cin >> n >> k;
    k--;

    int ans = 0;
    while (n--) {
        if (k%2) {
            ans += p[n];
            ans %= MOD;
        } k /= 2;
    }

    cout << ans+1 << endl;
    return 0;
}

/*
4
14
9
8
12
6
2
3
5
7
11
13
*/

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