Use the QR decomposition to prove Hadamard's inequality: if $X=(x_1,\cdots,x_n)$, then $$\bex |\det X|\leq \prod_{j=1}^n \sen{x_j}. \eex$$ Equality ho...
分类：
其他好文 时间：
2014-11-16 11:54:28
阅读次数：
107
http://www.nowamagic.net/librarys/veda/detail/636Hackers solve problems and build things, and they believe in freedom and voluntary mutual help. To be...
分类：
其他好文 时间：
2014-11-15 18:27:08
阅读次数：
308
There's usually a common strategy for "find *" problems - binary search: half the space can be dropped by some rules.And take care of corner cases.cla...
分类：
其他好文 时间：
2014-11-15 16:53:56
阅读次数：
171
描述When Teddy was a child , he was always thinking about some simple math problems ,such as “What it’s 1 cup of water plus 1 pile of dough ..” , “100 y...
分类：
其他好文 时间：
2014-11-15 06:32:43
阅读次数：
127
Problem Description After inventing Turing Tree, 3xian always felt boring when solving problems about intervals, because Turing Tree could easily have...
分类：
其他好文 时间：
2014-11-14 06:55:49
阅读次数：
227
Problem Description
After inventing Turing Tree, 3xian always felt boring when solving problems about intervals, because Turing Tree could easily have the solution. As well, wily 3xian made lots of...
分类：
其他好文 时间：
2014-11-14 01:41:02
阅读次数：
169
Reproduce:Ctrl + H, Select "File Search", will encounter eclipse kinds of bug/error alert:problems encountered during text searchReason:It's because C...
分类：
编程语言 时间：
2014-11-13 14:11:48
阅读次数：
164
Description
The advice to "buy low" is half the formula to success in the bovine stock market.To be considered a great investor you must also follow this problems' advice:
"Bu...
分类：
其他好文 时间：
2014-11-12 19:50:43
阅读次数：
301
原题地址：https://oj.leetcode.com/problems/min-stack/解题思路：开辟两个栈，一个栈是普通的栈，一个栈用来维护最小值的队列。代码：class MinStack: # @param x, an integer def __init__(self): ...
分类：
编程语言 时间：
2014-11-12 13:44:19
阅读次数：
213
A couple of years ago, a new world wide crisis started, leaving many people with economical problems. Some workers of a particular company are trying to ask for an increase in their salaries.
The c...
分类：
其他好文 时间：
2014-11-11 22:56:24
阅读次数：
285
