说明complete tree的最低level出现了。自此以后,queue再不该有node再有child, queue后面出现的node的左右孩子应该都是null. 40. Construct Binary Tree from Inorder and Postorder Traversal.java Level: Medium 写个Inorder和Postorder的例子。利用他们分left
//Code 1 261 Graph Valid Tree // #261 有效树形图 描述:给定一个无向图,判断其是否是一个有效地树形结构。 //#261Description: Graph Valid Tree | LeetCode OJ 解法1:N节点的树,必有N - 1条边,而且无环。那么,N = 0呢? // Solution 1: What makes an undirected graph a tree? What about ...
0918 Maximum Sum Circular Subarray Go 33.6% Medium 0919 Complete Binary Tree Inserter 57.3% Medium 0920 Number of Music Playlists Go 46.5% Hard 0921 Minimum Add to Make Parentheses Valid Go 73.6% Medium 0922 Sort Array By Parity II Go 69.2% Easy 0923 3Sum With Multiplicity Go 35.7% ...
0222 Count Complete Tree Nodes Go 46.7% Medium 0223 Rectangle Area Go 37.8% Medium 0224 Basic Calculator Go 36.8% Hard 0225 Implement Stack using Queues Go 45.1% Easy 0226 Invert Binary Tree Go 64.9% Easy 0227 Basic Calculator II 36.9% Medium 0228 Summary Ranges 39.5% Medium 0229...
就是逐一遍历所有的cell,用分离的cell总的的边数减去重叠的边的数目即可。在查找重叠的边的数目的时候有一点小技巧,就是沿着其中两个方向就好,这种题目都有类似的规律,就是可以沿着上三角或者下三角形的方向来做。一刷一次ac,但是还没开始注意codestyle的问题,需要再刷一遍。
clone graph: use a queue to clone BFS. Recursively clone DFS. number of islands: DFS can also be used to mask search result. If the original array can be modified, we can set the original array to be inverted value. Divide and conquer count complete tree nodes: count left and right. ...
39.Complete Binary Tree.javaLevel: Easy BFS Use a flag . 当出现了第一次有 null children的node的时候, 说明complete tree的最低level出现了。 自此以后,queue再不该有node再有child, queue后面出现的node的左右孩子应该都是null. 40.Construct Binary Tree from Inorder and Postorder Traversal.javaLevel: ...
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Given a complete binary tree, count the number of nodes.Definition of a complete binary tree from Wikipedia: In a complete binary tree every level, except possibly the last, is completely filled, and all nodes in the last level are as far left as possible. It can have between 1 and 2h...
0919 Complete Binary Tree Inserter 57.3% Medium 0920 Number of Music Playlists Go 46.5% Hard 0921 Minimum Add to Make Parentheses Valid Go 73.6% Medium 0922 Sort Array By Parity II Go 69.2% Easy 0923 3Sum With Multiplicity Go 35.7% Medium 0924 Minimize Malware Spread Go 42.0% Hard ...