제출 #1359398

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1359398		lyra_g13	Rack (eJOI19_rack)	C++20	100 / 100	3 ms	344 KiB

rack

#include <bits/stdc++.h>
using ll = long long;
using namespace std;
int main(){
    std::ios_base::sync_with_stdio(false);
    std::cin.tie(nullptr);

    ll n , k;
    cin >> n >> k;
    
    ll block =1;
    ll mod = 1000000000 + 7;

    ll ans = 1;
   for(int i = 0 ; i< n-1 ; i++){
    block = (block*2)%mod;
   }
    
    for(int i = 0 ; i < n and k > 1; i++){

      if(k%2 == 0){
        ans = (ans + block + mod)%mod;
      }

      k = (k+1)/2;

      if(block%2 == 0)
      block = block/2;
      else
      block = (block + mod)/2;
    }

    cout << ans << "\n";

}

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