首先，Lucas（卢卡斯）定理是什么？有
我们假设，然后，向不等式两边加上，
Optimum polynomialProblem 101If we are presented with the first k terms of a sequence it is impossible to say with certainty the value of the next term, as there are infinitely many polyno
B. Powers of Twotime limit per test3 secondsmemory limd outputYou are given n integers a1, a2, ..., an.
A Simple Chess题目链接：点我打开链接AuthorUESTCSou
PowMod （点击打开题目）Time Limit: 3000/1500 MS (Java/Others) Memory Limit: 262144/262144 K (J
The number of divisors(约数) about Hum
Pell方程在不定方程里经常出现，解其他方程的时候最后往往归结为对某个pell方程的讨论。本文不加证明的叙述几个pell方程的结论，并讨论怎么用连分数来具体算出特定pell方程的解。Pell方程，一般是指x^2-dy^2=1.①定理1：设d是一个正整数且不是一个完全平方，则方程①有无穷多组整数解x,y.设a^2-db^2=1,a>0,b>0,是所有x>0,y>0的解中使x+y√
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Disc game prize fundProblem 121A bag contains one red disc and one blue disc. In a game of chance a player takes a disc at rand
Prime cube partnershipProblem 131There are some prime values, p, for which there exists a positive integer, n, such that the expression n3 + n2p is a perfect cube.For example, when p = 1
题目链接： 点击打开链接 http://codeforces.com/contest/10/problem/C 题意： 定义d(x)d(x)为x
题目链接： HDU 5628题意： 给你f(i)。(i=1,2,…,n)f(i)。(i=1,2,…,n) 求g(i)=∑i1∣i∑i2∣i1∑i3∣i2⋯∑ik∣ik−1f(ik) mod 1000000007(1≤im_{i_3 \mid i_2} \cdots
题目链接： ACdream 1084题解：
题目链接： ACdream 1006题意：
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