Submission #1211183

#	Time	Username	Problem	Language	Result	Execution time	Memory
1211183		nguyn	Rack (eJOI19_rack)	C++20	40 / 100	5 ms	4604 KiB

rack

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

#define ll long long 
#define F first
#define S second
#define pb push_back 
#define pii pair<int,int>

const int N = 2e5 + 5;
const int mod = 1e9 + 7;

int n, k;

signed main(){
    ios_base::sync_with_stdio(false) ; 
    cin.tie(0) ; cout.tie(0) ; 
    if (fopen("INP.INP" ,"r")) {
        freopen("INP.INP" ,"r" , stdin) ;
        freopen("OUT.OUT" , "w" , stdout) ;
    }
    cin >> n >> k;
    if (n <= 20) {
	    vector<int> cur;
	    cur.pb(1); 
	    for (int i = (1 << (n - 1)); i >= 1; i >>= 1) {
	    	int sz = cur.size();
	    	for (int j = 0; j < sz; j++) {
	    		cur.pb(cur[j] + i); 
	    	}
	    }
	    // for (int i : cur) {
	    // 	cout << i << ' '; 
	    // }
	    cout << cur[k - 1]; 
    }
}

Compilation message (stderr)

rack.cpp: In function 'int main()':
rack.cpp:19:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   19 |         freopen("INP.INP" ,"r" , stdin) ;
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
rack.cpp:20:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   20 |         freopen("OUT.OUT" , "w" , stdout) ;
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

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