include using namespace std; struct Node { public:   int key;   struct Node *left,*right; }; struct Node *newNode(int data) {     Node *temp = (struct Node*)malloc(sizeof(struct Node));     temp->key = data;     temp->left = NULL;     temp->right = NULL;     return temp; } struct Node *insert(Node *node,

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Help me convert this into java. Thanks a lot!

 

#include<bits/stdc++.h>
using namespace std;
struct Node
{
public:
  int key;
  struct Node *left,*right;
};
struct Node *newNode(int data)
{
    Node *temp = (struct Node*)malloc(sizeof(struct Node));
    temp->key = data;
    temp->left = NULL;
    temp->right = NULL;
    return temp;
}
struct Node *insert(Node *node,int key)
{
    if(node == NULL)
    return newNode(key);
    
    if(key<node->key)
   node->left = insert(node->left,key);
    else if(key>node->key)
    node->right = insert(node->right,key);
    
    return node;
}
 
int maxDepth(Node* node)  
{  
    if (node == NULL)  
        return 0;  
    else
    {  
       
        int lDepth = maxDepth(node->left);  
        int rDepth = maxDepth(node->right);  
      
    
        if (lDepth > rDepth)  
            return(lDepth + 1);  
        else return(rDepth + 1);  
    }  
}  
int main()
{
    int t;
    cin>>t;
    while(t--)
    {
    int n;
    cin>>n;
    int a[n];
    for(int i=0;i<n;i++)
    cin>>a[i];
    
    struct Node *root = newNode(a[0]) ;
  
    for(int i=1;i<n;i++)
    {
        
        insert(root,a[i]);
    }
    
    int d = maxDepth(root);
    cout<<"max.no.of.person he kill:"<<d<<endl;
    }
    return 0;
}

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