Submission #1035248

#	Time	Username	Problem	Language	Result	Execution time	Memory
1035248		amine_aroua	Permutation (APIO22_perm)	C++17	0 / 100	1 ms	600 KiB

perm

#include "perm.h"
#include<bits/stdc++.h>
using namespace std;
#define ll long long
std::vector<int> construct_permutation(long long k)
{
	for(ll l = 1 ;l < 60 ;l++)
	{
		ll x = k + l - 1;
		if(__builtin_popcountll(x) <= l)
		{
			int n = 0;
			vector<int> bits;
			for(ll i = 0 ; i < 60 ; i++)
			{
				if((1ll<<i) & x)
				{
					bits.push_back(i);
				}
			}
			while ((int)bits.size() < l)
			{
				for(int i = 0 ; i < (int)bits.size() ; i++)
				{
					int bit = bits[i];
					if(bit > 1)
					{
						bits[i] = --bit;
						bits.push_back(bits[i]);
					}
				}
			}
			for(auto bit : bits)
				n+=bit;
			n--;
			vector<int> perm;
			for(auto i : bits)
			{
				for(int j = n - i + 1 ; j <= n ; j++)
				{
					perm.push_back(j);
				}
				n-=i;
			}
			return perm;
		}
	}
	return {-1};
}

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