Submission #531118

#	Time	Username	Problem	Language	Result	Execution time	Memory
531118		bucz	Rack (eJOI19_rack)	C++14	40 / 100	1 ms	204 KiB

rack

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const int MOD = 1e9+7;


int main(){
	int n; ll k;
	cin >> n >> k;
	k--;
	ll v=1;
	for(int i=0;i<n;i++){
		if(k%2==0){
			v=v*2%MOD;
		} else {
			v=v*2+1%MOD;
		}
		k=k/2;
	}
	ll p=1;
	for(int i=0;i<n;i++){
		p=p*2%MOD;
	}
	cout << v-p+1;
}

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