Amazon Interview Question for SDE-2s

Country: United States
Interview Type: In-Person

Comment hidden because of low score. Click to expand.
of 2 vote

Go through all the nodes, check if left and right exist, further check if their values are either lesser or greater than the node. Call the function recursively. Here's a java solution:

public boolean isValidBT(Node node)
	if(node == null)
		return true;

	if(node.hasLeft() && !( <
		return false;

	if(node.hasRight() && !( >
		return false;

	if( !isValidBST(node.left) || !isValidBST(node.right) )
		return false;

	return true;


- parikksit.b March 08, 2017 | Flag Reply

Add a Comment

Writing Code? Surround your code with {{{ and }}} to preserve whitespace.


is a comprehensive book on getting a job at a top tech company, while focuses on dev interviews and does this for PMs.

Learn More


CareerCup's interview videos give you a real-life look at technical interviews. In these unscripted videos, watch how other candidates handle tough questions and how the interviewer thinks about their performance.

Learn More

Resume Review

Most engineers make critical mistakes on their resumes -- we can fix your resume with our custom resume review service. And, we use fellow engineers as our resume reviewers, so you can be sure that we "get" what you're saying.

Learn More

Mock Interviews

Our Mock Interviews will be conducted "in character" just like a real interview, and can focus on whatever topics you want. All our interviewers have worked for Microsoft, Google or Amazon, you know you'll get a true-to-life experience.

Learn More