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Catalan Number
----------------------------------------------------转载-------------------------------------------------------- 应用1描述:n对括号有多少种匹配方式? 思路:n对括号相当于有2n个符号,.....
分类:其他好文   时间:2015-01-16 20:37:31    阅读次数:238
[LeetCode]Edit Distance
Given two words word1 and word2, find the minimum number of steps required to convert word1 to word2. (each operation is counted as 1 step.) You have the following 3 operations permitted on a word:...
分类:其他好文   时间:2015-01-16 19:15:26    阅读次数:177
【Leetcode】Largest Number
Given a list of non negative integers, arrange them such that they form the largest number. For example, given [3, 30, 34, 5, 9], the largest formed number is 9534330. Note: The result may be ve...
分类:其他好文   时间:2015-01-16 19:14:01    阅读次数:180
Oracle数据库row_number() over统计前15名企业, wm_concat(case when then)行转列
1. ROW_NUMBER() OVER函数的基本用法 语法:ROW_NUMBER() OVER(PARTITION BY COLUMN ORDER BY COLUMN) 例如:row_number() OVER (PARTITION BY COL1 ORDER BY COL2) 表示根据COL1分组,在分组内部根据 COL2排序,而此函数计算的值就表示每组内部排序后的顺序编号(...
分类:数据库   时间:2015-01-16 19:13:39    阅读次数:283
【leetcode】Largest Number ★
Given a list of non negative integers, arrange them such that they form the largest number.For example, given[3, 30, 34, 5, 9], the largest formed num...
分类:其他好文   时间:2015-01-16 18:43:33    阅读次数:193
[Twitter] Fibonacci Sequence
Question:Givenanumbern,givemeafunctionthatreturnsthenthfibonaccinumber.Runningtime,spacecomplexity,iterativevs.recursive.http://www.glassdoor.com/Interview/Given-a-number-n-give-me-a-function-that-returns-the-nth-fibonacci-number-Running-time-space-complexi..
分类:其他好文   时间:2015-01-16 17:06:01    阅读次数:105
LeetCode--Excel Sheet Column Number
Related to question Excel Sheet Column Title Given a column title as appear in an Excel sheet, return its corresponding column number. For example: A -> 1 B -> 2 C -> 3 ... ...
分类:其他好文   时间:2015-01-16 16:53:37    阅读次数:118
HDU 1394 Minimum Inversion Number
题意是求逆序数。 先无脑用线段树求出原数列的逆序数。 然后: 不过是把一个数列的第一个数放到最后。这样重复n-1次。在新数列中找出最小的逆序数。 假如第一个数是 a[i] 那么放到最后之后,新数列的逆序数为原数列的逆序数减去比 a[i]小的数,加上比 a[i]大的数。 即 ans=ans-2*a[i]+n-1; 这样就必须把输入的数列存下来。 #include #i...
分类:其他好文   时间:2015-01-16 16:51:22    阅读次数:187
LeetCode--Binary Search Tree Iterator
Implement an iterator over a binary search tree (BST). Your iterator will be initialized with the root node of a BST. Calling next() will return the next smallest number in the BST. Note: next()...
分类:其他好文   时间:2015-01-16 16:50:57    阅读次数:152
Combination Sum II -- leetcode
Given a collection of candidate numbers (C) and a target number (T), find all unique combinations in C where the candidate numbers sums to T. Each number in C may only be used once in the combina...
分类:其他好文   时间:2015-01-16 16:47:18    阅读次数:152
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