Urkupillit

#include <bits/stdc++.h>

using namespace std;

const int N = 1<<17;

int n,k;
set<int> s;

int main()
{
    cin>>n>>k;

    for(int i=0;i<n;i++)
    {
        s.insert(i+1);
    }

    int last = *s.rbegin();
    while(k>=last-1)
    {
        k -= last-1;
        cout<<last<<' ';
        s.erase(last);
        last = *s.rbegin();
    }

    if(k>=0)
    {
        s.erase(k+1);
        cout<<k+1<<' ';
    }

    for(int val : s)
    {
        cout<<val<<' ';
    }
}

Test 1

Group: 1

Verdict: ACCEPTED

Test 2

Group: 1

Verdict: RUNTIME ERROR

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: RUNTIME ERROR

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: WRONG ANSWER

Test 13

Group: 3

Verdict: WRONG ANSWER

Test 14

Group: 3

Verdict: WRONG ANSWER

Test 15

Group: 3

Verdict: ACCEPTED