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Path Sum
Given a binary tree and a sum, determine if the tree has a root-to-leaf path such that adding up all the values along the path equals the given sum. For example: Given the below binary tree and sum ...
分类:其他好文   时间:2015-03-30 13:20:37    阅读次数:84
Path Sum II
Given a binary tree and a sum, find all root-to-leaf paths where each path's sum equals the given sum. For example: Given the below binary tree and sum = 22, 5 / \...
分类:其他好文   时间:2015-03-30 13:14:32    阅读次数:89
LeetCode: Path Sum II 解题报告
Path Sum IIGiven a binary tree and a sum, find all root-to-leaf paths where each path's sum equals the given sum.For example:Given the below binary tr...
分类:其他好文   时间:2015-03-30 10:52:04    阅读次数:158
构造强连通图
我们知道,要把一个非边双连通图构造成一个边双连通图,只需把这个图化简(边双连通分量缩点)成一个树,然后 找出叶子节点个数leaf,(leaf+1)/2就是要新添加的边数。 现在,对与有向图来说,我们需要求加最少的边,使得一个非强连通图变成一个强连通图,最少的边数是多少? 同样的,我们需要...
分类:其他好文   时间:2015-03-28 17:00:41    阅读次数:192
Java——this
【this】在没有new一个对象前,this不知道指的是什么;当new出一个对象时,this指的是当前对象的引用。【分析】int i =0;这里的i指的是成员变量;Leaf(int i)这里的i是形参i(二者都在栈中,但不是一个变量)。this.i = i;后面的i未作说明,这是根据就近原则确定i指...
分类:编程语言   时间:2015-03-20 23:39:09    阅读次数:191
Sum Root to Leaf Numbers
https://leetcode.com/problems/sum-root-to-leaf-numbers/Given a binary tree containing digits from0-9only, each root-to-leaf path could represent a num...
分类:其他好文   时间:2015-03-19 17:51:26    阅读次数:150
LeetCode Maximum Depth of Binary Tree
Given a binary tree, find its maximum depth.The maximum depth is the number of nodes along the longest path from the root node down to the farthest leaf node.思路分析:这题比较简单,关于树的题目通常都可以用递归解决,这题也不例外,递归解法的思...
分类:其他好文   时间:2015-03-19 06:23:34    阅读次数:126
Path Sum(二叉树路径和)
Given a binary tree and a sum, determine if the tree has a root-to-leaf path such that adding up all the values along the path equals the given sum.Fo...
分类:其他好文   时间:2015-03-18 15:20:00    阅读次数:131
【LeetCode】 Sum Root to Leaf Numbers
第一次写的解法,。对于只有一个儿子的节点重复了两次 。。结果就弄复杂了。。我也觉得不应该能有这么多的重复嘛 /** * Definition for binary tree * public class TreeNode { * int val; * TreeNode left; * TreeNode right; * TreeNode(int x) ...
分类:其他好文   时间:2015-03-17 22:00:13    阅读次数:130
Sum Root to Leaf Numbers
/** * Definition for binary tree * struct TreeNode { * int val; * TreeNode *left; * TreeNode *right; * TreeNode(int x) : val(x), left(...
分类:其他好文   时间:2015-03-17 21:28:07    阅读次数:118
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