Submission #775530

#	Time	Username	Problem	Language	Result	Execution time	Memory
775530		DangerNoodle7591	Rack (eJOI19_rack)	C++17	40 / 100	1 ms	320 KiB

rack

#include<bits/stdc++.h>
using namespace std;
#define lalala ios_base::sync_with_stdio(false);cin.tie(NULL);
#define endl "\n"
#define ll long long
#define pb push_back
#define mod 1000000007
inline ll int hmm(ll int r,ll int k){
	if(r==1)return 1;
	ll int m=(1+r)/2;
	m=m%mod;
	//cout<<r<<" "<<m<<endl;
	if(k%2==0&&k!=0){
		return m+hmm(m,k/2);
	}
	else return hmm(m,(k+1)/2);
}
int main(){
	lalala;
	ll int n,k;cin>>n>>k;
	ll int arr[n+1];
	arr[0]=1;
	for(int i=1;i<=n;i++){
		arr[i]=(arr[i-1]*(ll int)2)%mod;
	}
	cout<<hmm(arr[n],k)<<endl;

}

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