许久的学习小窝

题目描述整个世界都在散发着恋爱的恶臭，只有spring依旧保持着单身贵族的清香。spring单身久了，煮饺子看见两个黏在一起的都要强行分开，所以在看到凸n边形的时候，总是习惯性的拆分成n-2个小三角形，毕竟第三者插足是spring最喜闻乐见的，那么给出一个凸n边形，有多少种方法能够将凸n边形分解成n-2个小三角形。输入输入一个正整数n，表示有个凸n变形  2<n<30...

Given n, a positive integer, how many positive integers less than n are relatively prime to n? Two integers a and b are relatively prime if there are no integers x > 1, y > 0, z > 0 such tha...

Problem DescriptionAs one of the most powerful brushes, zhx is required to give his juniors n problems.zhx thinks the ith problem's difficulty is i. He wants to arrange these problems in a beautif...

题目链接The Farey Sequence Fn for any integer n with n >= 2 is the set of irreducible rational numbers a/b with 0 < a < b <= n and gcd(a,b) = 1 arranged in increasing order. The first few ar...

2007年到来了。经过2006年一年的修炼，数学神童zouyu终于把0到100000000的Fibonacci数列(f[0]=0,f[1]=1;f[i] = f[i-1]+f[i-2](i>=2))的值全部给背了下来。接下来，CodeStar决定要考考他，于是每问他一个数字，他就要把答案说出来，不过有的数字太长了。所以规定超过4位的只要说出前4位就可以了，可是CodeStar自己又记不住...