【题目】
You are given an n x n 2D matrix representing an image.
Rotate the image by 90 degrees (clockwise).
Follow up:
Could you do this in-place?
【题意】
给定一个nXn的二维矩阵，按时钟方向旋转90度，不能使用额外的数据结构
【思路】
从外向内逐层旋转...
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其他好文 时间：
2014-05-26 05:50:25
阅读次数：
266
Background
Some concepts in Mathematics and Computer Science are simple in one or two dimensions but become more complex when extended to arbitrary dimensions. Consider solving differential equations...
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其他好文 时间：
2014-05-26 04:31:34
阅读次数：
234
Several ports(8080,8009)required by Tomcat v6.0 Server at localhost are already in use.The server may already be running in another process, or a system process may be using the port, To start this server you will need to stop the other process or change t...
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编程语言 时间：
2014-05-26 03:41:22
阅读次数：
364
题目
You are climbing a stair case. It takes n steps to reach to the top.
Each time you can either climb 1 or 2 steps. In how many distinct ways can you climb to the top?
解答...
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其他好文 时间：
2014-05-25 00:37:34
阅读次数：
284
【题目】
Given a matrix of m x n elements (m rows, n columns), return all elements of the matrix in spiral order.
For example,
Given the following matrix:
[
[ 1, 2, 3 ],
[ 4, 5, 6 ],
[ 7, 8, 9 ]
]
You should return [1,2,3,6,9,8,7,4,5].
【题意】
螺旋输出MxN...
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其他好文 时间：
2014-05-24 23:11:02
阅读次数：
279
题目如下：
Problem D: Hartals
A social research organization has determined a simple set of parameters to simulate the behavior of the political parties of our country. One of the ...
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其他好文 时间：
2014-05-24 23:10:01
阅读次数：
317
【题目】
Find the contiguous subarray within an array (containing at least one number) which has the largest sum.
For example, given the array [?2,1,?3,4,?1,2,1,?5,4],
the contiguous subarray [4,?1,2,1] has the largest sum = 6.
【题意】
给定一个数组，找出和最大的子数组，返回...
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其他好文 时间：
2014-05-24 22:19:17
阅读次数：
260
问题 L: Prime Factors
时间限制: 1 Sec 内存限制: 128 MB
提交: 36 解决: 28
[提交][状态][论坛]
题目描述
I'll give you a number , please tell me how many different prime factors in this number.
输入
There is multiple te...
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其他好文 时间：
2014-05-24 20:52:54
阅读次数：
311
【题目】
Given an array of non-negative integers, you are initially positioned at the first index of the array.
Each element in the array represents your maximum jump length at that position.
Determine if you are able to reach the last index.
For example:...
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其他好文 时间：
2014-05-24 20:44:39
阅读次数：
221
【题目】
Given an array of non-negative integers, you are initially positioned at the first index of the array.
Given a collection of intervals, merge all overlapping intervals.
For example,
Given [1,3],[2,6],[8,10],[15,18],
return [1,6],[8,10],[15,18].
...
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其他好文 时间：
2014-05-24 14:18:27
阅读次数：
193
