Submission #532588

#	Time	Username	Problem	Language	Result	Execution time	Memory
532588		PsiolixUK	Rack (eJOI19_rack)	C++14	100 / 100	12 ms	308 KiB

rack

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
constexpr int MOD = 1e9 + 7;
main()
{
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    int n;
    ll k;
    int pow = 1;
    int odp = 1;
    cin >> n >> k;
    --k;
    for(int i = 0; i < n; ++i)
    {
        if(k%2)
        {
            odp = ((ll)2 * odp + 1) % MOD;
        }
        else
        {
            odp = ((ll)2 * odp) % MOD;
        }
        k /= 2;
    }
    for(int i = 0; i < n; ++i)
        pow = ((ll)pow * 2) % MOD;
    cout << (odp - pow + 1 + MOD) % MOD;
}

Compilation message (stderr)

rack.cpp:5:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
    5 | main()
      | ^~~~

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