Submission #675661

#	Time	Username	Problem	Language	Result	Execution time	Memory
675661		Truitadepatates	Rack (eJOI19_rack)	C++14	100 / 100	5 ms	340 KiB

rack

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

int mod = 1000000007;
vector<bool> kbinari;
int n;

void binari(long long int k){
  int i = n-1;
  while (k > 0){
    if (k%2 == 1) kbinari[i] = true;
    else kbinari[i] = false;
    k /= 2;
    i--;
  }
}

int main() {
  ios::sync_with_stdio(0);
  cin.tie(0);
  long long int k;
  cin >> n >> k;
  kbinari = vector<bool>(n);
  binari(k-1);
  long long int ans = 1;
  long long int potencia = 1;
  for (int i = 0; i < n; i++){
    if (kbinari[i] == true){
      ans += potencia;
      ans %= mod;
    }
    potencia *= 2;
    potencia %= mod;
  }
  cout << ans << "\n";
  return 0;
}

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