Submission #594368

#	Time	Username	Problem	Language	Result	Execution time	Memory
594368		mohammad_kilani	Permutation (APIO22_perm)	C++17	10 / 100	2 ms	340 KiB

perm

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


std::vector<int> construct_permutation(long long k){
	k--;
	vector< int > ret;
	int mx = 0;
	while((1LL << (mx + 1)) <= k)
		mx++;
	int a = 0;
	for(int i = 0 ;i <= mx;i++){
		if(((k >> i) & 1) == 1)
			a++;
	}
	if(a == mx + 1){
		for(int i = 0 ;i <= mx;i++)
			ret.push_back(i);
		return ret;
	}
	for(int i = 0 ;i < mx;i++)
			ret.push_back(i);
		k -= (1 << mx) - 1;

	bool add = false;
	
	a = 0;

	mx = 0;
	while((1LL << (mx + 1)) <= k)
		mx++;

	for(int i = 0 ;i <= mx;i++){
		if(((k >> i) & 1) == 1)
			a++;
	}

	if(a > mx + 1 - a){
		k--;
		add = true;
	}

	for(int i = 59 ;i >= 0;i--){
		if(((k >> i) & 1) == 1){
			ret.insert(ret.begin() + i , (int)ret.size());
		}
	}

	if(add)
		ret.insert(ret.begin(), (int)ret.size());

	return ret;
}

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