Find last element challenge

#1

#include
using namespace std;
long long int last_index(long long int a[],long long int n,long long int m,long long int i)
{
if(i==n)
return -1;
long long int rr=last_index(a,n,m,i+1);
if(a[i]==m && rr==-1)
return i;
return rr;
}
int main()
{
long long int n,m ,i;
cin>>n;
long long int a[n];
for(i=0;i<n;i++)
cin>>a[i];
cin>>m;
cout<<"Last occurence of “<<m<<” is found at "<<last_index(a,n,m,0);
return 0;
}
I am getting segmentation fault.

#2

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