Submission #1262085

#	Time	Username	Problem	Language	Result	Execution time	Memory
1262085		iordache_	Rack (eJOI19_rack)	C++20	100 / 100	8 ms	328 KiB

rack

#include <bits/stdc++.h>
#define pb push_back
#define int long long
using namespace std;
const int N=1e6+5;int mod=1e9+7;

signed main()
{
    ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
    int n,k;
    cin>>n>>k;
    vector<bool> is(n+5);
    for(int i=n;i>0;--i)
    {
        if(i>60) {is[i]=1;continue;}
        if(k<=(1ll<<(i-1))) {is[i]=1;continue;}
        k-=(1ll<<(i-1));
    }
    int ans=1;
    for(int i=1;i<=n;++i) ans=(ans*2-is[i]+mod)%mod;
    cout<<ans;
}

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