1080. Insufficient Nodes in Root to Leaf Paths

https://leetcode.com/problems/insufficient-nodes-in-root-to-leaf-paths

Description

Given the root of a binary tree and an integer limit, delete all insufficient nodes in the tree simultaneously, and return the root of the resulting binary tree.

A node is insufficient if every root to leaf path intersecting this node has a sum strictly less than limit.

A leaf is a node with no children.

Example 1:

**Input:** root = [1,2,3,4,-99,-99,7,8,9,-99,-99,12,13,-99,14], limit = 1
**Output:** [1,2,3,4,null,null,7,8,9,null,14]

Example 2:

**Input:** root = [5,4,8,11,null,17,4,7,1,null,null,5,3], limit = 22
**Output:** [5,4,8,11,null,17,4,7,null,null,null,5]

Example 3:

**Input:** root = [1,2,-3,-5,null,4,null], limit = -1
**Output:** [1,null,-3,4]

Constraints:

• The number of nodes in the tree is in the range [1, 5000].

• -105 <= Node.val <= 105

• -109 <= limit <= 109

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