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采用存储过程的方式批量更新数据
采用存储过程的方式批量更新数据,Oracle中也可采用merge-update的方式更新,不过采用如下存储过程的方式会更快些DECLARE MAX_ROWSNUMBERDEFAULT5000; ROW_ID_TABLEDBMS_SQL.UROWID_TABLE; DATE_TIME_TABLEDBMS_SQL.DATE_TABLE; CURSORC1IS SELECT/*+use_hash(t1,t2)parallel(t..
分类:其他好文   时间:2015-03-11 19:55:39    阅读次数:691
Merge Sorted Array
//两个指针从后往前扫一遍就行void merge(int A[], int m, int B[], int n) { int i = m-1,j = n - 1 ,k = m+n-1; while(i>=0&&j>=0){ if(A[i]>B[j]) A[k--] = A...
分类:其他好文   时间:2015-03-11 14:37:53    阅读次数:115
Insert Interval
Given a set of non-overlapping intervals, insert a new interval into the intervals (merge if necessary). You may assume that the intervals were initially sorted according to their start times. Examp...
分类:其他好文   时间:2015-03-10 21:27:41    阅读次数:134
【LeetCode从零单排】No.160 Intersection of Two Linked Lists
题目Write a program to find the node at which the intersection of two singly linked lists begins.For example, the following two linked lists:A: a1 → a2 ↘ ...
分类:其他好文   时间:2015-03-10 15:33:24    阅读次数:171
Java-分治算法
一、分治算法的原理分治算法就是将一个规模为N的问题分解成K个规模较小的子问题,这些子问题相互独立且与原问题性质相同,求出子问题的解,就可以得出原问题的解二、分治算法的伪代码实现合并算法Merge 1 MERGE(A, p, q, r) 2 n1 ← q - p + 1 3 n2 ← r ...
分类:编程语言   时间:2015-03-10 13:31:00    阅读次数:223
LeetCode | # 23
题目: Merge k sorted linked lists and return it as one sorted list. Analyze and describe its complexity. 思路: 解法一:维护一个大小为k的堆,每次去堆顶的最小元素放到结果中,然后读取该元素的下一个元素放入堆中,重新维护好。因为每个链表是有序的,每次又是去当前k个元素中最小的,...
分类:其他好文   时间:2015-03-09 22:32:10    阅读次数:203
归并排序
如果归并排序中待归并的两个相邻序列分别Wi是r[start]~r[mid]和r[mid+1]~r[end],需要将其归并成一个新序列r1[start]~r1[end]:void merge(int r[], int r1[], int start, int mid, int end) { int i = start, j = mid + 1, k = start; while (i...
分类:编程语言   时间:2015-03-09 19:12:33    阅读次数:164
LeetCode_Merge Two Sorted Lists
题目链接:https://leetcode.com/problems/merge-two-sorted-lists/ 题目:Merge two sorted linked lists and return it as a new list. The new list should be made by splicing together the nodes of the first two ...
分类:其他好文   时间:2015-03-09 11:05:29    阅读次数:134
LeetCode_Intersection of Two Linked Lists
题目链接:https://leetcode.com/problems/intersection-of-two-linked-lists/ 题目: Write a program to find the node at which the intersection of two singly linked lists begins. For example, the followi...
分类:其他好文   时间:2015-03-09 11:05:15    阅读次数:145
归并排序,分治思想
merge函数将两列有序序列合成一列。 merge_sort 函数使用分治思想,递归求解。将对一个序列排序转换成对左右两个序列排序,一直到序列长度为一时,递归开始回升。再将左右两个已经排好序的序列合并。 // // main.cpp // merge_sort // // Created by Fangpin on 15/3/9. // Copyright (c) 2015年 Fang...
分类:编程语言   时间:2015-03-09 11:00:57    阅读次数:163
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