求大佬帮忙看看，全是tle

#include<iostream>

using namespace std;
  
   
    
void inverse_order(int a[],int l,int r)
{   int sum=0;
    if(l>=r)return ;
    
 int mid=(l+r)/2;
 inverse_order(a,l,mid),inverse_order(a,mid+1,r);
 int i=l, j=mid+1, temp[100000],k=0;

 while(i<=mid&&j<=r)
 {
     while(a[i]<a[j])temp[k++]=a[i++];
     while(a[i]>a[j])
     {   sum+=mid+1-i;
         temp[k++]=a[j++];
     };
 }
    while(i<mid)temp[k++]=a[i++];
    while(j<r)temp[k++]=a[j++];
    
    
    for(int i=l;i<r;i++)
    a[i]=temp[i];
    
 }