【题目】
Follow up for "Remove Duplicates":
What if duplicates are allowed at most twice?
For example,
Given sorted array A = [1,1,1,2,2,3],
Your function should return length = 5, and A is now [1,1,2,2,3].
【题意】
给定一个有序数组,给数组去重,和Remove Duplicates from...
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其他好文 时间:
2014-06-03 05:36:24
阅读次数:
219
1、
??
Construct Binary Tree from Inorder and Postorder Traversal
Given inorder and postorder traversal of a tree, construct the binary tree.
Note:
You may assume that duplicates do not exist in...
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其他好文 时间:
2014-06-03 03:13:59
阅读次数:
195
Given a singly linked list
L: L0→L1→…→Ln-1→Ln,
reorder it to: L0→Ln→L1→Ln-1→L2→Ln-2→…
You must do this in-place without altering the nodes' values.
For example,
Given {1,2,3,4}, r...
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其他好文 时间:
2014-06-03 03:12:46
阅读次数:
222
【题目】
Given a 2D board and a word, find if the word exists in the grid.
The word can be constructed from letters of sequentially adjacent cell, where "adjacent" cells are those horizontally or vertically neighboring. The same letter cell may not be use...
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其他好文 时间:
2014-06-03 01:07:58
阅读次数:
329
【题目】
Given a linked list and a value x, partition it such that all nodes less than x come before nodes greater than or equal to x.
You should preserve the original relative order of the nodes in each of the two partitions.
For example,
Given 1->4->3-...
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其他好文 时间:
2014-06-03 00:02:29
阅读次数:
270
1、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.
clas...
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其他好文 时间:
2014-06-02 23:13:22
阅读次数:
290
【题目】
Given a 2D binary matrix filled with 0's and 1's, find the largest rectangle containing all ones and return its area.
【题意】
给定一个由0和1填充的二维矩阵,找一个全是1的最大矩形
【思路】
扫描二维矩阵,凡是扫到值为1的块时候,以当前块为矩形的左上角区块拓展,找最大矩阵。
先找出以每个“1”区块为左上角区块的最大矩形,然后求出最大全局的最大矩...
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其他好文 时间:
2014-06-02 23:08:07
阅读次数:
289
题目:
给定一个字符串,返回该串没有重复字符的最长子串。
分析:
1)子串:子串要求是连续的。
2)无重复,出现重复就断了,必须从新的位置开始。而新的位置就是重复字符第一次出现位置的下一个位置。
3)整个串可能没有一处重复。
那么,为了找出当前访问的字符是否出现过,要怎么做呢?当然是hash,O(1)的时间,而且既然是字符, 定义个255的hash table 就可以了,has...
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其他好文 时间:
2014-06-01 10:48:31
阅读次数:
206
【题目】
Given n non-negative integers representing the histogram's bar height where the width of each bar is 1, find the area of largest rectangle in the histogram.
Above is a histogram where width of each bar is 1, given height = [2,1,5,6,2,3].
The...
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其他好文 时间:
2014-06-01 10:46:29
阅读次数:
242
题目:
给定整数n,返回n对匹配的小括号字符串数组。
For example, given n = 3, a solution set is:
"((()))", "(()())", "(())()", "()(())", "()()()"
分析:
这种问题的模式是:1)问题的解有多个 ,2)每个解都是由多个有效的 ”步骤“ 组成的,3)变更以有解的某个或某些”步骤“ 可...
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其他好文 时间:
2014-05-31 22:28:45
阅读次数:
467