Submission #1035313

#	Time	Username	Problem	Language	Result	Execution time	Memory
1035313		amine_aroua	Permutation (APIO22_perm)	C++17	66.15 / 100	11 ms	1820 KiB

perm

#include "perm.h"
#include<bits/stdc++.h>
using namespace std;
#define ll long long
vector<int> bits;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
ll myrand(ll l , ll r)
{
	return uniform_int_distribution<ll>(l , r)(rng);
}
void add(ll k)
{
	if(k == 0)
	{
		return;
	}
	ll last = 1;
	for(ll i = 59 ; i >= 1 ; i--)
	{
		if(k - ((1ll<<i) - 1) >= 0)
		{
			last = max(last , i);
		}
		if(k - ((1ll<<i) - 1) == 0)
		{
			bits.push_back(i);
			return;
		}
	}
	ll nb = myrand(max(1ll , last - 1) , last);
	k -= ((1ll<<nb) - 1);
	bits.push_back(nb);
	add(k);
}
std::vector<int> construct_permutation(long long k)
{
	k--;
	bits.clear();
	int n = 0;
	add(k);
	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;
}

• Subtask 1: 10 / 10
• Subtask 2: 56.153846151 / 90