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搜索关键字:over(partition by ...order by ...)    ( 29066个结果
快速排序
快速排序也利用了分治的思想,跟归并排序排序相比减少了交换次数int partition(int a[],int p,int r){ int x = a[r]; int i = p-1; int j; for(j = p;j<r;j++) { if(a[j]...
分类:其他好文   时间:2014-05-26 02:47:46    阅读次数:226
正则表达式中$1,$2 ===算是什么意思
能举个例子吗?我也知道是括号里面取得值 但是哪个和哪个括号不清楚 还有是小括号中括号大括号也不清楚 能举个实例吗?$1,$2...是表示的小括号里的内容 $1是第一个小括号里的 ,$2是第2个小括号里的 比如 /gai([\w]+?)over([\d]+)/ 匹配 gainover123 $1= 括...
分类:其他好文   时间:2014-05-26 00:04:22    阅读次数:282
Oracle分页语句
select * from (select A.*,rownum rd from (select * from [tablename] where [condition] order by [condition] ) A where rownum=[startpage*pagesize];1.sel...
分类:数据库   时间:2014-05-25 22:29:33    阅读次数:349
LeetCode:Add Two Numbers
You are given two linked lists representing two non-negative numbers. The digits are   stored in  reverse order and each of their nodes contain a single digit. Add the two numbers   and return i...
分类:其他好文   时间:2014-05-25 21:36:52    阅读次数:268
何时产生临时表?
我们在执行某些SQL语句的时候有可能会生成临时表.我们应该尽量的去避免临时表.因为临时表会浪费内存和时间.那么什么情况下会产生临时表呢?这是来自MYSQL官方的说明If there is an ORDER BY clause and a different GROUP BY clause[官方说明]...
分类:其他好文   时间:2014-05-25 11:25:04    阅读次数:199
Geeks : Kruskal’s Minimum Spanning Tree Algorithm 最小生成树
寻找图中最小连通的路径,图如下: 算法步骤: 1. Sort all the edges in non-decreasing order of their weight. 2. Pick the smallest edge. Check if it forms a cycle with the spanning tree formed so far. If cycle is n...
分类:其他好文   时间:2014-05-25 07:35:59    阅读次数:301
LeetCode: Spiral Matrix II [058]
【题目】 Given an integer n, generate a square matrix filled with elements from 1 to n2 in spiral order. For example, Given n = 3, You should return the following matrix: [ [ 1, 2, 3 ], [ 8, 9, 4 ], [ 7, 6, 5 ] ] 【题意】 给定整数n, 将1,2,3...nxn个数按螺旋旋转的方式填入n...
分类:其他好文   时间:2014-05-25 07:08:17    阅读次数:235
LeetCode: Permutation Sequence [059]
【题目】 The set [1,2,3,…,n] contains a total of n! unique permutations. By listing and labeling all of the permutations in order, We get the following sequence (ie, for n = 3): "123" "132" "213" "231" "312" "321" Given n and k, return the kth permutation ...
分类:其他好文   时间:2014-05-25 06:13:37    阅读次数:276
SPOJ 3273 - Order statistic set , Treap
点击打开链接 题意: 集合S支持一下四种操作:   INSERT(S,x) :   如果S中没有x,则插入x DELETE(S,x):  如果S中有x,则删除x K-TH(S):            输出S中第K小的数 COUNT(S,x):    统计S中小于x的数有多少个 一共有Q(1 ≤ Q ≤ 200000)次操作。 Treap模板。。 #i...
分类:其他好文   时间:2014-05-24 18:03:11    阅读次数:213
LeetCode——Palindrome Partition
Palindrome Partitioning   Given a string s, partition s such that every substring of the partition is a palindrome. Return all possible palindrome partitioning of s. For example, given s = "...
分类:其他好文   时间:2014-05-24 14:29:45    阅读次数:222
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