the code is pretty small.

Time-0.08sec, Memory- 23.2M Got all correct

#include <bits/stdc++.h>
 
using namespace std;
 
 
int main()
{
    long long n;
    scanf("%lld",&n);
    long long arr[n];
    long long val[n];
    for(long long i=0;i<n;i++){
        scanf("%lld",&arr[i]);
    }
    sort(arr,arr+n);
    long long cnt=n;
    for(long long i=0;i<n;i++){
        val[i]=arr[i]*cnt;
        cnt--;
    }