Submission #785322

#	Time	Username	Problem	Language	Result	Execution time	Memory
785322		mindiyak	Permutation (APIO22_perm)	C++17	0 / 100	1 ms	212 KiB

perm

#include "perm.h"
#include <cmath>
#include <deque>
#include <iostream>
#define ll long long
#define pb push_back
using namespace std;

int binary_search(ll val){
	int l = 0,r = 61;
	while(l<r){
		int mid = (l+r) >> 1;
		// cout << val << " " << l << " " << mid << " " << r << endl;
		if(val < pow(2,mid)){
			r = mid-1;
		}else{
			l = mid+1;
		}
	}
	// cout << "lenght " << l << endl << endl;
	return l;
}

std::vector<int> construct_permutation(long long k)
{
	deque<pair<int,int>> ans;
	int n = 0;
	while(k > 0){
		int temp = binary_search(k)-1;
		ans.push_front({n,n+temp});
		k -= pow(2,temp+1);
		n += temp + 1;
	}
	vector<int> arr;
	for(int i=0;i<ans.size();i++){
		// cout << ans[i].first << " " << ans[i].second << endl;
		for(int j=ans[i].first;j<=ans[i].second;j++){
			arr.pb(j);
		}
	}

	// for(int i=0;i<arr.size();i++){
	// 	cout << arr[i] << " "; 
	// } cout << endl;
	return arr;
}

Compilation message (stderr)

perm.cpp: In function 'std::vector<int> construct_permutation(long long int)':
perm.cpp:35:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::deque<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   35 |  for(int i=0;i<ans.size();i++){
      |              ~^~~~~~~~~~~

• Subtask 1: 0 / 10
• Subtask 2: 0 / 90