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简单理解 NP, P, NP-complete和NP-Hard
P是一类可以通过确定性图灵机(以下简称 图灵机)在多项式时间(Polynomial time)内解决的问题集合。NP是一类可以通过非确定性图灵机(Non-deterministic Turing Machine)在多项式时间(Polynomial time)内解决的决策问题集合。P是NP的子集,也就...
分类:其他好文   时间:2015-01-26 16:31:21    阅读次数:150
python time
得到当前的时间戳import time#得到float类型 1422258513.05now = time.time()#得到整数型时间戳 1422258513nowi = int(now)http://www.cnblogs.com/wanpython/archive/2010/08/...
分类:编程语言   时间:2015-01-26 16:25:56    阅读次数:163
poj3252--Round Numbers
Round Numbers Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 9565   Accepted: 3433 Description The cows, as you know, have no fingers or thumbs and thus are...
分类:其他好文   时间:2015-01-26 15:14:31    阅读次数:161
poj1753--Flip Game(高斯消元问题2,枚举自由元的首杀)
Flip Game Time Limit:1000MS     Memory Limit:65536KB     64bit IO Format:%I64d & %I64u Submit Status   Description Flip game is played on a rectangular 4x4 field with two-sided piec...
分类:其他好文   时间:2015-01-26 15:10:30    阅读次数:167
POJ3164---Command Network
Command Network Time Limit: 1000MS   Memory Limit: 131072K Total Submissions: 13609   Accepted: 3925 Description After a long lasting war on words, a war on arms finally ...
分类:Web程序   时间:2015-01-26 15:08:57    阅读次数:208
zoj 3157 Weapon 逆序数/树状数组
B - Weapon Time Limit:1000MS Memory Limit:32768KB 64bit IO Format:%lld & %lluSubmit StatusDescriptionIn World War 3, your countries' scientists have i...
分类:编程语言   时间:2015-01-26 15:01:46    阅读次数:308
java 获取特定天数的时间戳
1 public Timestamp strToDate(int type){ 2 Timestamp time = null; 3 DateFormat format2= new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"...
分类:编程语言   时间:2015-01-26 14:52:34    阅读次数:275
mina例子中英文对照
英文: This tutorial will walk you through the process of building a MINA based program. This tutorial will walk through building a time server. The following prerequisites are required for this tu...
分类:其他好文   时间:2015-01-26 13:49:39    阅读次数:302
Best Time to Buy and Sell Stock III Leetcode Python
Say you have an array for which the ith element is the price of a given stock on day i. Design an algorithm to find the maximum profit. You may complete at most two transactions. Note: You may not eng...
分类:编程语言   时间:2015-01-26 13:45:27    阅读次数:200
hdu 4323 Magic Number( DP )
题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=4323 Magic Number Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others) Total Submission(s): 1728    Accepted Submissi...
分类:其他好文   时间:2015-01-26 13:45:10    阅读次数:116
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