Build bst prblm

#1

node* build(int a[],int s,int e,int n){
int mid=s+e/2;

if(s>e || e>n-1 ||s<0){
	return NULL;
}
node *root=new node(a[mid]);

root->left=build(a,s,mid-1,n);
root->right=build(a,mid+1,e,n);
return root;

}
whats the prblm in this code

#2

mid=(si+ei)/2;

brackets are important

#3

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