Submission #631215

#	Time	Username	Problem	Language	Result	Execution time	Memory
631215		typ	Rack (eJOI19_rack)	C++14	100 / 100	10 ms	1236 KiB

rack

#include<bits/stdc++.h>

using namespace std;

const long long MOD = 1e9+7;
long long n, k, pom=1, liczba=1;

main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);

    cin>>n>>k;
    k--;
    stack<bool> bin;
    for(int i=0;i<n;i++)
    {
        bin.push(k%2);
        k/=2;
    }

    while(n--)
    {
        if(bin.top())
            liczba = (liczba+pom)%MOD;
        bin.pop();
        pom = (2*pom)%MOD;
    }

    cout<<liczba;

    return 0;
}

Compilation message (stderr)

rack.cpp:8:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
    8 | main()
      | ^~~~

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