摘要：
Yash is finally tired of computing the length of the longest Fibonacci-ish sequence. He now plays around with more complex things such as Fibonacci-is 阅读全文
摘要：
题意：给出N，K，M，P。求有多少长度为K的序列A，满足：（1）首项为正整数；（2）递增数列；（3）相邻两项的差小于等于m；（4）最后一个数小于等于N。 思路：根据差分来算数量。 阅读全文
摘要：
There is a sequence aa of length nn. We use aiai to denote the ii-th element in this sequence. You should do the following three types of operations t 阅读全文
摘要：
At the children's day, the child came to Picks's house, and messed his house up. Picks was angry at him. A lot of important things were lost, in parti 阅读全文