How to Solve Delete Leaves With a Given Value Problem
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Delete Leaves With a Given Value
Given a binary tree root and an integer target, delete all the leaf nodes with value target. Note that once you delete a leaf node with value target, if its parent node becomes a leaf node and has the...
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Understanding the Delete Leaves With a Given Value Problem
Let's break down this LeetCode problem and understand what makes it challenging in interview settings.
Problem Statement
Given a binary tree root and an integer target, delete all the leaf nodes with value target. Note that once you delete a leaf node with value target, if its parent node becomes a leaf node and has the value target, it should also be deleted (you need to continue doing that until you cannot).
Delete Leaves With a Given Value
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Examples
root = [1,2,3,2,null,2,4], target = 2[1,null,3,null,4]Leaf nodes in green with value (target = 2) are removed (Picture in left). After removing, new nodes become leaf nodes with value (target = 2) (Picture in center).
root = [1,3,3,3,2], target = 3[1,3,null,null,2]root = [1,2,null,2,null,2], target = 2[1]Leaf nodes in green with value (target = 2) are removed at each step.
Constraints
The number of nodes in the tree is in the range [1, 3000].1 <= Node.val, target <= 1000How Interview Coder Helps with Leetcode Problems
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