Submission #1219702

#	Time	Username	Problem	Language	Result	Execution time	Memory
1219702		Solikha	Rack (eJOI19_rack)	C++17	0 / 100	0 ms	320 KiB

rack

//#include <bits/stdc++.h>
#include <iostream>
#include <vector>
#include <list>
#include <map>
#include <set>
#include <deque>
#include <queue>
#include <stack>
#include <bitset>
#include <algorithm>
#include <functional>
#include <numeric>
#include <utility>
#include <sstream>
#include <iomanip>
#include <cstdio>
#include <cmath>
#include <cstdlib>
#include <cctype>
#include <string>
#include <cstring>
#include <ctime>
#include <random>
#include <chrono>
using namespace std;
#define int long long
#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()
#define ss second
#define ff first
#define pb push_back 
using ull = unsigned long long;
const int mod = 1e9 + 7;
int power(int a, int b){
  if(b == 0) return 1;
  if(b == 1) return a % mod;
  if(b % 2 == 0){
    int y = power(a, b / 2);
    return y * y % mod;
  }else return power(a, b - 1) * a % mod;
}

void solve()
{
  int n, k; cin >> n >> k;
  auto rec = [&](auto&& rec, int i, int j) -> int{
    if(i == 0) return 1;
    if(j % 2) return rec(rec, i - 1, j / 2 + 1);
    else return (rec(rec, i - 1, j / 2) + power(2, i - 1)) % mod;
  };

  cout << rec(rec, n, k);

}
 
signed main() {
  cin.tie(nullptr)->sync_with_stdio(false);
  // freopen("input.txt", "r", stdin);
  freopen("output.txt", "w", stdout);
  int t = 1; //cin >> t;
  while(t--){
    solve();
    cout << endl;
  }
  return 0;
}

Compilation message (stderr)

rack.cpp: In function 'int main()':
rack.cpp:60:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   60 |   freopen("output.txt", "w", stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

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