Submission #827875

#	Time	Username	Problem	Language	Result	Execution time	Memory
827875		ZeroCool	Rack (eJOI19_rack)	C++14	100 / 100	9 ms	8132 KiB

rack

#include <bits/stdc++.h>
using namespace std;

#define int long long
#define mp make_pair
#define pb push_back

using ll = long long;
using ld = long double;


void solve(int T);
void pre();

const int mxn = 1e6 + 5;
const int SQRT = 500;
const int LOG = 20;
const int inf = 1e18;
const int mod = 1e9 + 7;
const ld eps = 1e-9;

int32_t main(){
	pre();
	int tt = 1;
	//cin>>tt;
	for(int i = 1;i<=tt;i++)solve(i);
    return 0;
}

int p[mxn+1];

void pre(){
	#ifdef ONLINE_JUDGE
    ios::sync_with_stdio(false);
    cin.tie(0);
	#endif
	p[0] = 1;
	for(int i = 1;i<=mxn;i++){
		p[i] = (2 * p[i-1]) % mod;
	}
}

void solve(int T){
	int n,k;
	cin>>n>>k;

	int ans = 1;

	for(int i = n-1;i>=0;i--){
		if(k % 2 == 0){
			ans += p[i];
			ans %= mod;
		}
		else {
			k++; 
		}
		k /= 2;
	}

	cout<<ans<<endl;
}

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