Submission #1112008

#	Time	Username	Problem	Language	Result	Execution time	Memory
1112008		vjudge1	Rack (eJOI19_rack)	C++17	100 / 100	3 ms	8016 KiB

rack

#include <bits/stdc++.h>

using namespace std;

#define int long long

int t,n,a,b,cevap,k,pw[1000005];

inline int add(int x,int y){
	if(x+y>=1000000007)return x+y-1000000007;
	return x+y;
}

int32_t main(){
	ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
	cin>>n>>k;
	pw[0]=1;
	for(int i=1;i<=n;i++){
		pw[i]=add(pw[i-1],pw[i-1]);
	}
	cevap=1;
	int us=n-1;
	while(k!=1){
		if(k%2==0)cevap=add(cevap,pw[us]);
		us--;
		k=(k+1)/2;
	}
	cout<<cevap<<endl;
	return 0;
}

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