Invert Binary Tree

EasyTreesTree

Solve this the way you would in the interview: out loud, on a timer, with an AI interviewer asking follow-ups while you code. You get a scored report at the end.

Practice this as a mock interviewFree to start, no account needed

Problem

Given the root of a binary tree, invert the tree, and return its root.

Examples

Input: root = [4,2,7,1,3,6,9]
Output: [4,7,2,9,6,3,1]
Input: root = [2,1,3]
Output: [2,3,1]
Input: root = []
Output: []

Constraints

  • The number of nodes in the tree is in the range [0, 100].
  • -100 <= Node.val <= 100

What the interviewer grades

A correct solution is one of five scores. The report also grades problem understanding (did you clarify inputs and edge cases before coding), problem solving, communication while you work, code quality, and testing. See a sample report, or read up on the pattern in the lessons.

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