Submission #1188536

#	Time	Username	Problem	Language	Result	Execution time	Memory
1188536		andrei_n	Rack (eJOI19_rack)	C++20	100 / 100	7 ms	328 KiB

rack

#include <bits/stdc++.h>
#define int long long
#define MOD 1000000007LL

using namespace std;

signed main()
{
    ios::sync_with_stdio(false); cin.tie(0); cout.tie(0);
    int n,k; cin>>n>>k;
    int res = 1;
    --k;
    for(int i=1; i<=n; ++i)
    {
        res = (res << 1) % MOD;
        if(i > 64 || (k & (1LL << i-1)) == 0) res = (res - 1) % MOD;
    }
    cout<<res;
    return 0;
}

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