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[家里蹲大学数学杂志]第030期复旦大学2010年实分析竞赛试题参考解答
1设 $f$ 是实直线 $\bbR$ 上的实函数, 若有常数 $M>0$ 使得对任何有限个两两不同的实数 $x_1,\cdots,x_n$ 都有 $\dps{\sev{\sum_{i=1}^nf(x_i)}\leq M}$. 证明: $\sed{x;\ f(x)\neq 0}$ 是至多可数的.解答:...
分类:其他好文   时间:2014-05-27 01:59:09    阅读次数:327
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:Multiply Strings
题目链接Given two numbers represented as strings, return multiplication of the numbers as a string.Note: The numbers can be arbitrarily large and are non-...
分类:其他好文   时间:2014-05-19 14:10:25    阅读次数:250
LeetCode:Add Two Numbers
题目链接 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 si...
分类:其他好文   时间:2014-05-19 13:53:32    阅读次数:296
找到数组中唯一重复的数
#include#include#includeusing namespace std;int helper1(int a[],int n){ int sum = accumulate(a,a+n,0); int sum2 = n*(n-1)/2; return sum-sum2;}int h...
分类:其他好文   时间:2014-05-19 12:25:25    阅读次数:183
【LeetCode】Add Binary
Given two binary strings, return their sum (also a binary string).For example,a ="11"b ="1"Return"100".public class Solution { public String addBin...
分类:其他好文   时间:2014-05-19 12:15:49    阅读次数:220
【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 ...
分类:其他好文   时间:2014-05-19 12:05:23    阅读次数:386
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