摘要：
Given a non-empty array of integers, return the k most frequent elements. For example,Given [1,1,1,2,2,3] and k = 2, return [1,2]. Note: You may assum
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posted @ 2016-09-25 06:23
Machelsky
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Given an unsorted array nums, reorder it in-place such that nums[0] <= nums[1] >= nums[2] <= nums[3].... For example, given nums = [3, 5, 2, 1, 6, 4],
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posted @ 2016-09-24 17:42
Machelsky
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Given an array with n objects colored red, white or blue, sort them so that objects of the same color are adjacent, with the colors in the order red,
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posted @ 2016-09-24 11:14
Machelsky
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恢复内容开始 Merge two sorted linked lists and return it as a new list. The new list should be made by splicing together the nodes of the first two lists. 思
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posted @ 2016-09-24 10:26
Machelsky
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摘要：
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
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posted @ 2016-09-24 06:17
Machelsky
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摘要：
Given a binary tree, return all root-to-leaf paths. For example, given the following binary tree: All root-to-leaf paths are: Solution1: 用string是最方便的。
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posted @ 2016-09-24 04:49
Machelsky
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Remove the minimum number of invalid parentheses in order to make the input string valid. Return all possible results. Note: The input string may cont
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posted @ 2016-09-24 03:15
Machelsky
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摘要：
Given a string containing just the characters '(' and ')', find the length of the longest valid (well-formed) parentheses substring. For "(()", the lo
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posted @ 2016-09-24 02:20
Machelsky
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摘要：
Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid. The brackets must close in the
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posted @ 2016-09-24 01:45
Machelsky
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