Submission #796680

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
796680	2023-07-28 15:38:11	Trisanu_Das	Permutation (APIO22_perm)	C++17	100 / 100	2 ms	340 KiB

perm

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
#include <bits/stdc++.h>
using namespace std;
 
vector<int> construct_permutation(long long k){
  vector<int> ans;
  long long pow_2 = 1, exp_2 = 0, flag = 0, curr = 0;
  while(pow_2 * 2 <= k) pow_2 *= 2, exp_2++;
  for(int i = exp_2 - 1; i > -1; i--){
    ans.push_back(curr++);
  if((k >> i) & 1){
    if(i and (k >> (i-1) & 1) and flag > 1) ans.push_back(curr++), ans.insert(ans.begin() + 2, curr++), i--;
    else ans.insert(ans.begin(), curr++), flag++;
  }
  }
  return ans;
}
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

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