Submission #530390

#	Time	Username	Problem	Language	Result	Execution time	Memory
530390		Piokemon	Rack (eJOI19_rack)	C++17	100 / 100	9 ms	316 KiB

rack

#include <bits/stdc++.h>
using namespace std;

long long int const m = 1000000007;

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    long long int n,k,odp,pot;
    cin >> n >> k;
    odp = 1;
    k -= 1;
    for (int x=0;x<n;x++){
        odp = (odp*2 + (k%2)) % m;
        k = k/2;
    }
    pot = 1;
    for (int x=0;x<n;x++){
        pot = (pot*2) % m;
    }
    cout << (odp - pot + 1 + m) % m<< "\n";
}

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