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poj--3086
escriptionThenthTriangularnumber,T(n) = 1 + … +n, is the sum of the firstnintegers. It is the number of points in a triangular array withnpoints on si...
分类:其他好文   时间:2014-05-19 19:50:24    阅读次数:191
多表查找
比较经典一个课程学分表C(cno, cname, ccredit)一个学生选课表SC(sno, cno, grade)select sno from sc,c where sc.cno=c.sno and sc.grade>=60 group by sno having sum(credit)>=3...
分类:其他好文   时间:2014-05-19 17:06:41    阅读次数:218
Leetcode | Combination Sum I && II
Combination Sum IGiven a set of candidate numbers (C) and a target number (T), find all unique combinations in C where the candidate numbers sums to T...
分类:其他好文   时间:2014-05-19 16:41:14    阅读次数:269
丘成桐大学生数学竞赛2010年分析与方程个人赛试题参考解答
1 (1)Let $\sed{x_k}_{k=1}^n \subset (0,\pi)$, and define $$\bex x=\frac{1}{n}\sum_{k=1}^n x_i. \eex$$ Show that $$\bex \prod_{k=1}^n \frac{\sin x_k}{x...
分类:其他好文   时间:2014-05-19 14:46:27    阅读次数:388
LeetCode 016 3Sum Closest
【题目】 Given an array S of n integers, find three integers in S such that the sum is closest to a given number, target. Return the sum of the three integers. You may assume that each input would have exactly one solution. For example, given array S = {...
分类:其他好文   时间:2014-05-18 10:37:57    阅读次数:269
LeetCode 017 4Sum
【题目】 Given an array S of n integers, are there elements a, b, c, and d in S such that a + b + c + d = target? Find all unique quadruplets in the array which gives the sum of target. Note: Elements in a quadruplet (a,b,c,d) must be in non-descending ord...
分类:其他好文   时间:2014-05-18 08:46:04    阅读次数:227
[leetcode]:Two Sum
题目:给定一个数组,以及一个 target 值,target 表示目标和,要求在数组中找到两个数,xi,xj,使得 xi + xj = target。返回值是找到的两个数的下标索引,升序排序。假定至少存在一对解。 分析:对于要处理数组的问题,我们的理想状态都是给定的数组是有序的就好了,在有序后,我们就可以首位各放一个标记。类似于二分查找。 vector twoSum(vector &n...
分类:其他好文   时间:2014-05-18 08:04:03    阅读次数:234
[LeetCode]3Sum Closest
3SumClosest Given an array S of n integers, find three integers in S such that the sum is closest to a given number, target. Return the sum of the three integers. You may assume that each input would have exactly one solution....
分类:其他好文   时间:2014-05-18 05:57:48    阅读次数:244
数据结构与算法一
题目一:求1!+2!+…..+n! 的和的后6位,(注意n的范围) #include using namespace std; const int MAX = 1000000; int getResu(int n) { int sum=0; int temp= 1; for(int i=1; i <= n; i++) { temp *= i; temp %= MAX; ...
分类:其他好文   时间:2014-05-18 03:36:19    阅读次数:223
LeetCode 015 3Sum
【题目】 Given an array S of n integers, are there elements a, b, c in S such that a + b + c = 0? Find all unique triplets in the array which gives the sum of zero. Note: Elements in a triplet (a,b,c) must be in non-descending order. (ie, a ≤ b ≤ c) The so...
分类:其他好文   时间:2014-05-18 03:15:50    阅读次数:287
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