What is wrong with this code

#1

#include
using namespace std;
int fun(long long int a[1000000],int n,long long int key)
{
int l=0;
int h=n-1;
while(l<=h)
{ int mid=(l+h)/2;
if(a[mid]<key)
{
l++;
}
else if(a[mid]>key)
{
h–;
}
else{
return mid;
}
}
return 0;
}
int main() {
int n;
cin>>n;
long long int arr[100000];
for(int i=0;i<n;i++)
{
cin>>arr[i];
}
long long int key;
cin>>key;
cout<<fun(arr,n,key);
return 0;
}

#2

@Kunalgoyal lot of small errors.
l=mid+1 in first mid cond, e=mid-1 instead of e-- , return -1 not 0 in case not found.

#3

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