Inversiot

#include <iostream>
using namespace std;
int main() {
  ios::sync_with_stdio(0);
  cin.tie(0);
  long n, k;
  cin >> n >> k;
  long fc = 1, bc = n;
  for (long i = 0; i < n; ++i) {
    if (k >= n-i-1) {
      k -= n-i-1;
      cout << bc-- << " ";
    } else {
      cout << fc++ << " ";
    }
  }
  cout << endl;
}

Test 1

Group: 1

Verdict: ACCEPTED

Test 2

Group: 1

Verdict: ACCEPTED

Test 3

Group: 1

Verdict: ACCEPTED

Test 4

Group: 1

Verdict: ACCEPTED

Test 5

Group: 1

Verdict: ACCEPTED

Test 6

Group: 2

Verdict: ACCEPTED

Test 7

Group: 2

Verdict: ACCEPTED

Test 8

Group: 2

Verdict: ACCEPTED

Test 9

Group: 2

Verdict: ACCEPTED

Test 10

Group: 2

Verdict: ACCEPTED

Test 11

Group: 3

Verdict: ACCEPTED

Test 12

Group: 3

Verdict: ACCEPTED

Test 13

Group: 3

Verdict: ACCEPTED

Test 14

Group: 3

Verdict: ACCEPTED

Test 15

Group: 3

Verdict: ACCEPTED