Amazon Interview Question for Java Developers


Country: United States




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public class TreeQns {

public static Tree BuildTree(int[] input, int start , int end)
{
if(end < start)
{
return null;
}

int mid = start + (end-start)/2;

Tree root = new Tree(input[mid]);

root.left = BuildTree(input, start, mid-1);
root.right = BuildTree(input, mid+1, end);

return root;
}


public static void PrintInorderH(Tree root)
{
if(root == null)
{
return;
}

PrintInorderH(root.left);
System.out.print(" " + root.info);
PrintInorderH(root.right);
}

public static void PrintInorder(Tree root)
{
PrintInorderH(root);
System.out.println();
}

public static void DeleteNodes(Tree root)
{
if(root == null)
{
return;
}

DeleteNodes(root.left);
root.left = null;
DeleteNodes(root.right);
root.right = null;

}

public static void DeleteNodes(Tree root, int nodeInfo)
{
if(root == null)
{
return;
}


if(root.left != null && root.left.info == nodeInfo)
{
DeleteNodes(root);
return;
}

if(root.right != null && root.right.info == nodeInfo)
{
DeleteNodes(root);
return;
}

DeleteNodes(root.left, nodeInfo);
DeleteNodes(root.right, nodeInfo);
}


public static void main(String[] args)
{
int[] in = new int[] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11};

Tree root = BuildTree(in, 0, in.length-1);
System.out.println("ROOT " + root.info);
PrintInorder(root);
DeleteNodes(root, 7);
PrintInorder(root);

in = new int[] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11};
root = BuildTree(in, 0, in.length-1);
DeleteNodes(root, 4);
PrintInorder(root);
}


}

class Tree {
public int info;
public Tree left;
public Tree right;

public Tree(int info)
{
this.info = info;
this.left = null;
this.right = null;
}
}

- Guru March 30, 2018 | Flag Reply


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