Submission #956929

#	Time	Username	Problem	Language	Result	Execution time	Memory
956929		LaviniaTornaghi	Permutation (APIO22_perm)	C++17	91.33 / 100	2 ms	600 KiB

perm

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

vector<int> construct_permutation(long long k) {
  int last_digit = 63 - __builtin_clzll(k);
  int extras = __builtin_popcountll(k);
  
  vector<int> ans;
  int lo = extras - 2;
  int hi = extras - 1;
  
  for (int b = last_digit - 1; b >= 0; b--) {
    ans.push_back(hi++);
    if ((k >> b) & 1) ans.push_back(lo--);
  }
  
  return ans;
}

• Subtask 1: 10 / 10
• Subtask 2: 81.333333333 / 90