IPOC_BUPT的博客

题目描述 题目链接 https://leetcode.com/problems/find-mode-in-binary-search-tree/ 方法思路 Approach1： based on HashMap class Solution { //Runtime: 6 ms, faster than 51.99% //Memory Usage: 40.3 MB, less th...

题目描述 Given a binary tree, return the vertical order traversal of its nodes values. For each node at position (X, Y), its left and right children respectively will be at positions (X-1, Y-1) and (X+1, ...