Bookshelves Problem Code: ZCO16001

I am trying to solve this problem but I can’t understand why my solution is failing. What Am I missing?

My Code:
#include
#include <bits/stdc++.h>
using namespace std;

typedef long long int ll;

int main()
{
ll n, k;
vector shelf1, shelf2, temp;

cin >> n >> k;

ll n1, n2;
n1 = n;
n2 = n;
while(n1--)
{
    ll temp;
    cin >> temp;
    shelf1.push_back(temp);
}

while(n2--)
{
    ll temp;
    cin >> temp;
    shelf2.push_back(temp);
}


/*cout << "INITIAL : " << endl;
for(int i = 0; i < n; i++) cout << shelf1[i] << ", ";
cout << endl;
for(int i = 0; i < n; i++) cout << shelf2[i] << ", ";
cout << endl;
*/

//sorting the heights in ascending order
sort(shelf1.begin(), shelf1.end(), greater<>());
sort(shelf2.begin(), shelf2.end(), greater<>());

if (shelf1[n - 1] < shelf2[n -1])
{
    temp.assign(shelf2.begin(), shelf2.end());
    shelf2.assign(shelf1.begin(), shelf1.end());
    shelf1.assign(temp.begin(), temp.end());
}

for (int i = 0; i < k; i++)
{
    
    if (shelf2[0] > shelf1[n - 1])
    {
        swap(shelf2[0], shelf1[n - 1]);
        sort(shelf1.begin(), shelf1.end(), greater<>());
        sort(shelf2.begin(), shelf2.end(), greater<>());
    }
}




/*cout << "FINAL : " << endl;
for(int i = 0; i < n; i++) cout << shelf1[i] << ", ";
cout << endl;
for(int i = 0; i < n; i++) cout << shelf2[i] << ", ";
cout << endl;*/


ll skew = shelf1[0] + shelf2[0];
cout << skew;

//write code above
return 0;

}

Pls give question link, and link to your solution. The system has mangled your solution, and it wouldn’t compile.

https://www.codechef.com/ZCOPRAC/problems/ZCO16001

https://www.codechef.com/viewsolution/27338040