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Leetcode 386 Lexicographical Numbers题目原文Given an integer n, return 1 - n in lexicographical order.For example, given 13, return: [1,10,11,12,13,2,3,4,5,6,7,8,9].Please optimize your algorith

Leetcode 257 Binary Tree Paths题目原文Given a binary tree, return all root-to-leaf paths.For example, given the following binary tree: 1 / \2 3 \ 5All root-to-leaf paths are:["