Submission #1028445

#	Time	Username	Problem	Language	Result	Execution time	Memory
1028445		raphaelp	Rack (eJOI19_rack)	C++14	100 / 100	8 ms	8068 KiB

rack

#include <bits/stdc++.h>
using namespace std;
int main()
{
    long long N, K;
    cin >> N >> K;
    K--;
    long long x = 1;
    long long MOD = 1000000007;
    vector<long long> power(N);
    long long base = 1;
    for (long long i = 0; i < N; i++)
    {
        power[i] = base;
        base *= 2;
        base = base % MOD;
    }
    for (long long i = 0; i < N; i++)
    {
        if (K % 2)
        {
            x = (x + power[N - i - 1]) % MOD;
        }
        K /= 2;
    }
    cout << x;
}

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