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[leetcode]Recover Binary Search Tree @ Python
原题地址:https://oj.leetcode.com/problems/recover-binary-search-tree/题意:Two elements of a binary search tree (BST) are swapped by mistake.Recover the tree...
分类:编程语言   时间:2014-05-26 13:25:43    阅读次数:261
Leetcode: Convert Sorted Array to Binary Search Tree
基本上一次过,要注意边界条件的问题:如果在recursion里有两个参数int begin, end, 递归写作recursion(num, mid+1, end), 因为+号的原因,递归中是会出现begin > end 的情况的,所以考虑初始条件的时候应该要考虑充分。 1 /** 2 * Def....
分类:其他好文   时间:2014-05-26 12:12:49    阅读次数:257
Scramble String
Given a strings1, we may represent it as a binary tree by partitioning it to two non-empty substrings recursively.Below is one possible representation...
分类:其他好文   时间:2014-05-26 11:24:36    阅读次数:214
[leetcode]Validate Binary Search Tree @ Python
原题地址:https://oj.leetcode.com/problems/validate-binary-search-tree/题意:检测一颗二叉树是否是二叉查找树。解题思路:看到二叉树我们首先想到需要进行递归来解决问题。这道题递归的比较巧妙。让我们来看下面一棵树: ...
分类:编程语言   时间:2014-05-26 10:48:19    阅读次数:291
[leetcode]Same Tree @ Python
原题地址:https://oj.leetcode.com/problems/same-tree/题意:判断两棵树是否是同一棵树。解题思路:这题比较简单。用递归来做。首先判断两个根节点的值是否相同,如果相同,递归判断根的左右子树。代码:# Definition for a binary tree n....
分类:编程语言   时间:2014-05-26 10:30:17    阅读次数:289
[leetcode]Symmetric Tree @ Python
原题地址:https://oj.leetcode.com/problems/symmetric-tree/题意:判断二叉树是否为对称的。Given a binary tree, check whether it is a mirror of itself (ie, symmetric around ...
分类:编程语言   时间:2014-05-26 10:18:52    阅读次数:293
leetcode题目:Sum Root to Leaf Numbers和Longest Consecutive Sequence
题目一: Given a binary tree containing digits from 0-9 only, each root-to-leaf path could represent a number. An example is the root-to-leaf path 1->2->3 which represents the number 123. Fin...
分类:其他好文   时间:2014-05-26 04:06:41    阅读次数:248
poj 2985 The k-th Largest Group 求第K大数 Treap, Binary Index Tree, Segment Tree
题目链接:点击打开链接 题意:有两种操作,合并集合,查询第K大集合的元素个数。(总操作次数为2*10^5) Treap模板(静态数组) #include #include #include #include #include const int maxNode = 500000 + 100; const int inf = 0x3f3f3f3f; struct Tr...
分类:其他好文   时间:2014-05-24 23:18:09    阅读次数:522
poj 3031 Big Christmas Tree(水spfa)
http://poj.org/problem?id=3013 题意: Because of a technical difficulty, price of an edge will be (sum of weights of all descendant nodes) × (unit price of the edge).这句话一直没看懂。后面还以为是最小生成树。 正确...
分类:其他好文   时间:2014-05-24 20:27:13    阅读次数:266
50. 树的子结构[subtree structure in tree]
subtree structure in tree
分类:其他好文   时间:2014-05-24 09:23:20    阅读次数:283
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