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【leetcode】Edit Distance 详解
题目:给定两个字符串word1,word2,将word2变成word1所需的最小步数。规定只能用以下三种操作进行修改,且每种操作的步数都计为1. op1:插入一个字符 op2:删除一个字符 op3:替换一个字符 例: word1 = word, word2 = wore, 则将wore的e替换为d则可。 word1 = word,word2 =  wor,则在wor的后面插入一个d则可...
分类:其他好文   时间:2014-05-25 22:56:24    阅读次数:303
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
[LeetCode] 数学计算模拟类问题:除法和幂,注意越界问题。题 Pow(x, n) ,Divide Two Integers
引言数学计算的模拟类题目,往往是要求实现某种计算(比如两数相除),实现的过程中会有所限定,比如不允许乘法等等。这类题目首先要注意计算过程中本身的特殊情况。比如求相除,则必须首先反映过来除数不能为0。其次要记得考虑负数的情况,如果计算范围不单单是整数,还要考虑double的比较方式。最后要注意越界情况...
分类:其他好文   时间:2014-05-25 19:10:39    阅读次数:287
【LeetCode】Remove Duplicates from Sorted Array
Remove Duplicates from Sorted ArrayGiven a sorted array, remove the duplicates in place such that each element appear only once and return the new len...
分类:其他好文   时间:2014-05-25 19:08:31    阅读次数:203
[leetcode]_Remove Duplicates from Sorted Array II
题目:一个有序数组,要求保证数组中的每个元素不能超过2个。 输入:A =[1,1,1,2,2,3] 输出:length =5, and A is now[1,1,2,2,3]思路:双指针 。有些绕,不过理清了后,思路还是很直接明朗的。1、两个指针:p和help。初始化时同时指向数组头。变量cur.....
分类:其他好文   时间:2014-05-25 16:15:16    阅读次数:285
Oracle DETERMINISTIC函数、PARALLEL_ENABLE函数、PIPELINED函数、RESULT_CACHE函数
1、DETERMINISTIC函数-- Create deterministic PV function.CREATE OR REPLACE FUNCTION pv( future_value NUMBER, periods NUMBER, interest NUMBER )RETURN NUMBE...
分类:数据库   时间:2014-05-25 15:30:11    阅读次数:625
[leetcode]_Merge Sorted Array
题目:合并两个有序数组A , B,将合并后的数组存到A中。假设A的空间足够装下A和B所有的元素。思路:这道题考虑如果正向扫描两个数组,则每插入一个元素,则需移动A后的所有元素。换个角度想,既然元素个数一定,则从尾部扫描两个数组,依次放入到A的尾部,这样既不会产生大量元素的移动,也不会造成A中元素被覆...
分类:其他好文   时间:2014-05-25 15:09:32    阅读次数:222
LeetCode: Insert Interval [056]
【题目】 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. Example 1: Given intervals [1,3],[6,9], insert and mer...
分类:其他好文   时间:2014-05-25 12:56:43    阅读次数:271
LeetCode: Length of Last Word [057]
【题目】 Given a string s consists of upper/lower-case alphabets and empty space characters ' ', return the length of last word in the string. If the last word does not exist, return 0. Note: A word is defined as a character sequence consists of non-space ...
分类:其他好文   时间:2014-05-25 07:39:05    阅读次数:256
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
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