257. Binary Tree Paths

LeetCodeStringBacktrackingTreeDepth-First SearchBinary TreeOpen on judge ↗

Given the root of a binary tree, return all root-to-leaf paths in any order. A leaf is a node with no children. Example 1: Input: root = [1,2,3,null,5] Output: ["1->2->5","1->3"] Example 2: Input: root = [1] Output: ["1"] Constraints: - The number of nodes in the tree is in the range [1, 100]. - -100 <= Node.val <= 100

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solution.cppC++17

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