LeetCode Link 思路：按層剪掉 leaf nodes，當(dāng)最終只剩一個或者兩個 nodes，即為題解 可以使用 HashMap > map，這樣就不用使用 inde...
IP屬地：華盛頓州
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310. Minimum Height Trees
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169 Follow Up: 229. Majority Element II
給定 array of integers, 返回個數(shù)多余 len/3 的 items要求： Linear Runtime, O(1) Space 思路：滿足條件的 items...
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169. Majority Element給定一個 array，輸出超出半數(shù)的 item 一題多解，各種思路，面試熱點問題。From 花花醬, 題解思路如下: Solution 1: HashMap Runtime:...
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238. Product of Array Except Self
LeetCode Link下面的 Solution 可以 optimize to O(1) space: leftToRight as res rightToLeft sto...
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236. Lowest Common Ancestor of a Binary Tree
LeetCode Solution 1 Solution 2 with parent reference Solution 3 Find Two path and compa...
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207. & 210. Course Schedule I & II
Course Schedulehttp://www.itdecent.cn/p/341a09e86930 Course Schedule IIhttps://www.jia...
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139. & 140. Word Break I & II
Word Break:http://www.itdecent.cn/p/c661daf51a01 Word Break IIhttp://www.itdecent.cn/...
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78.& 90. Subsets I & II
Given a set of distinct integers, nums, return all possible subsets (the power set). No...
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49. Group Anagrams
Given an array of strings, group anagrams together. Example: Note: All inputs will be i...
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353. Design Snake Game題目分析: Move 會有以下幾種情況：out of boarder => return -1hit self => return -1special case: 如果下一個...
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Fibonacci
題目鏈接：Fibonacci In mathematics, the Fibonacci numbers are the numbers in the following i...
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366. Find Leaves of Binary TreeLeetCode Link depth and height are properties of a node:The depth of a node is the numb...
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84. Largest Rectangle in Histogram這種 Wrapper 方式比較好理解題解思路，以及處理 Corner case。下面的題解思路同上面一致。 另一種類似寫法：
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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...