LeetCode Link 思路：按层剪掉 leaf nodes，当最终只剩一个或者两个 nodes，即为题解 可以使用 HashMap > map，这样就不用使用 inde...
IP属地：华盛顿州
-
310. Minimum Height Trees
-
169 Follow Up: 229. Majority Element II
给定 array of integers, 返回个数多余 len/3 的 items要求： Linear Runtime, O(1) Space 思路：满足条件的 items...
-
169. Majority Element给定一个 array，输出超出半数的 item 一题多解，各种思路，面试热点问题。From 花花酱, 题解思路如下: Solution 1: HashMap Runtime:...
-
238. Product of Array Except Self
LeetCode Link下面的 Solution 可以 optimize to O(1) space: leftToRight as res rightToLeft sto...
-
236. Lowest Common Ancestor of a Binary Tree
LeetCode Solution 1 Solution 2 with parent reference Solution 3 Find Two path and compa...
-
207. & 210. Course Schedule I & II
Course Schedulehttps://www.jianshu.com/p/341a09e86930 Course Schedule IIhttps://www.jia...
-
139. & 140. Word Break I & II
Word Break:https://www.jianshu.com/p/c661daf51a01 Word Break IIhttps://www.jianshu.com/...
-
78.& 90. Subsets I & II
Given a set of distinct integers, nums, return all possible subsets (the power set). No...
-
49. Group Anagrams
Given an array of strings, group anagrams together. Example: Note: All inputs will be i...
-
-
-
353. Design Snake Game题目分析: Move 会有以下几种情况：out of boarder => return -1hit self => return -1special case: 如果下一个...
-
Fibonacci
题目链接：Fibonacci In mathematics, the Fibonacci numbers are the numbers in the following i...
-
366. Find Leaves of Binary TreeLeetCode Link depth and height are properties of a node:The depth of a node is the numb...
-
-
84. Largest Rectangle in Histogram这种 Wrapper 方式比较好理解题解思路，以及处理 Corner case。下面的题解思路同上面一致。 另一种类似写法：
-
-
-
281. Zigzag IteratorLeetCode Link Follow up: Extend to List of List List of iterators如果保持所有的 iterators，那么 n...
