Submission #699132

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
699132	2023-02-15 17:46:02	dxz05	Permutation (APIO22_perm)	C++17	71.22 / 100	12 ms	1320 KiB

perm

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#include "perm.h"
#include <bits/stdc++.h>
using namespace std;
vector<int> construct_permutation(long long k){
  int lg = 63 - __builtin_clzll(k);
  k--;
  vector<int> blocks;
  int x = 61;
  while (k > 0){
    if (k >= (1ll << x) - 1){
      k -= (1ll << x) - 1;
      blocks.push_back(x);
      x++;
    }
    x--;
  }
  vector<int> res;
  for (int sz : blocks){
    int val = res.size() + sz - 1;
    for (int i = 0; i < sz; i++){
      res.push_back(val--);
    }
  }
 
 
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Compilation message (stderr)

perm.cpp: In function 'std::vector<int> construct_permutation(long long int)':
perm.cpp:7:6: warning: unused variable 'lg' [-Wunused-variable]
    7 |  int lg = 63 - __builtin_clzll(k);
      |      ^~

• Subtask 1: 10 / 10
• Subtask 2: 61.215384618 / 90