Submission #464876

#	Time	Username	Problem	Language	Result	Execution time	Memory
464876		ewirlan	Rack (eJOI19_rack)	C++17	40 / 100	1 ms	256 KiB

rack

//RACK

#define _CTR_SECURE_NO_WARNINGS
#include <iostream>
#include <algorithm>
typedef long long int ll;
template <typename T> T in()
{
    T x;
    std::cin >> x;
    return x;
}
constexpr int mod = 1e9 + 7;
int main()
{
    std::cin.tie(nullptr); std::cout.tie(nullptr); std::ios_base::sync_with_stdio(0);
    int n(in<int>());
    ll K(in<ll>());
    ll p(0), k((1ll << std::min(62, n)) - 1), s, odp(1), pot(1);
    while (k > p)
    {
        s = (p + k + 1) / 2;
        if (K <= s)k = s - 1;
        else
        {
            p = s;
            odp = (odp + pot) % mod;
        }
        pot = (pot * 2) % mod;
    }
    std::cout << odp << '\n';
    return 0;
}

• Subtask 1: 20 / 20
• Subtask 2: 20 / 20
• Subtask 3: 0 / 60