Submission #796510

#	Time	Username	Problem	Language	Result	Execution time	Memory
796510		Godgift42	Rack (eJOI19_rack)	C++14	100 / 100	4 ms	300 KiB

rack

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

int main(){
    int n;
    cin >> n;
    unsigned long long k;
    cin >> k;
    unsigned long long ans=0;
    for(int i=0;i<n;i++){
        if((k&1)==0){
            k=k/2;
            ans = (ans << 1)%1000000007;
            ans++;
        }
        else{
            k=k/2+1;
            ans = (ans << 1)%1000000007;
        }
    }
    cout << (ans+1)%1000000007 << "\n";
    return 0;
}

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