Submission #467344

#	Time	Username	Problem	Language	Result	Execution time	Memory
467344		TlenekWodoru	Rack (eJOI19_rack)	C++14	100 / 100	11 ms	308 KiB

rack

#include <bits/stdc++.h>
using namespace std;
unsigned long long mod=1000000007;
int main()
{ ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    unsigned long long n,k;cin>>n>>k;
    unsigned long long v=1;
    k--;
    unsigned long long poww=1;
    for(int i=1;i<=n;i++)
    {
        poww=(poww*2)%mod;
        if(k%2==0)
        {
            v=(v*2)%mod;
        }
        else
        {
            v=(v*2+1)%mod;
        }
        k=k/2;
    }
    cout<<((v+mod)-poww+1)%mod<<endl;
    return 0;
}

Compilation message (stderr)

rack.cpp: In function 'int main()':
rack.cpp:10:18: warning: comparison of integer expressions of different signedness: 'int' and 'long long unsigned int' [-Wsign-compare]
   10 |     for(int i=1;i<=n;i++)
      |                 ~^~~

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