Submission #1099544

#	Time	Username	Problem	Language	Result	Execution time	Memory
1099544		vjudge1	Rack (eJOI19_rack)	C++17	100 / 100	8 ms	8028 KiB

rack

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

string abc = "abcdefghijklmnopqrstuvwxyz";

#define int long long



signed  main(){
    int mod = 1e9+7;
    int n, k;
    cin >> n >> k;

    int ans = 0;


    vector<int> v(n);

    v[0]=1;
    for(int i = 1; i < n; i++){
        v[i]=(v[i-1]*2)%mod;
    }

    int aux = 1;
    for(int i = 0; i < min(n, (int) 63); i++){
        if((k-1)&aux){
            ans+=v[n-i-1];
            ans%=mod;
        }
        aux*=2;
    }

    cout << (ans+1)%mod << endl;
}

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