为什么在Front互加的情况下报了TLE？

50pts:

#include<bits/stdc++.h>
using namespace std;
int n,sum=0;
int arr[10005],Front,Rear;
int main(){
    cin>>n;
    Front=1;
    for(int i=1;i<=n;i++) cin>>arr[i];
    sort(arr+1,arr+n+1);
    while(Front!=n){
        sum=sum+arr[Front]+arr[Front+1];
        arr[Front+1]+=arr[Front];
        Front++;
        sort(arr+Front,arr+n+1);
    }
    cout<<sum;
    return 0;
}