题目：
Given a string containing just the characters '(', ')', '{', '}', '[' and ']',
determine if the input string is valid.
The brackets must close in the correct order, "()" and "()[]{}" are...
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其他好文 时间：
2015-05-05 10:35:05
阅读次数：
144
Happy NumberTotal Accepted:7315Total Submissions:22724My SubmissionsQuestionSolutionWrite an algorithm to determine if a number is "happy".A happy num...
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移动开发 时间：
2015-05-05 10:16:08
阅读次数：
130
https://leetcode.com/problems/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...
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其他好文 时间：
2015-05-05 01:15:10
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184
https://leetcode.com/problems/palindrome-number/Determine whether an integer is a palindrome. Do this without extra space.click to show spoilers.Some ...
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其他好文 时间：
2015-05-04 21:35:51
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127
1 题目描述Write an algorithm to determine if a number is "happy".A happy number is a number defined by the following process: Starting with any positive i...
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移动开发 时间：
2015-05-04 17:29:12
阅读次数：
145
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 bina...
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其他好文 时间：
2015-05-04 15:30:49
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113
https://leetcode.com/problems/happy-number/Write an algorithm to determine if a number is "happy".A happy number is a number defined by the following ...
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移动开发 时间：
2015-05-04 15:12:32
阅读次数：
123
https://leetcode.com/problems/isomorphic-strings/Given two stringssandt, determine if they are isomorphic.Two strings are isomorphic if the characters...
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其他好文 时间：
2015-05-04 13:30:33
阅读次数：
118
题目描述
Given a binary tree, determine if it is height-balanced.
For this problem, a height-balanced binary tree is defined as a binary tree in which the depth of the two subtrees of every node n...
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其他好文 时间：
2015-05-04 12:06:20
阅读次数：
96
problem：
Given a linked list, determine if it has a cycle in it.
Follow up:
Can you solve it without using extra space?
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Linked List Two
Pointers
...
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其他好文 时间：
2015-05-04 12:05:09
阅读次数：
148
