摘要：
You are given an integer array of length nn. You have to choose some subsequence of this array of maximum length such that this subsequence forms a in 阅读全文
摘要：
Polycarp likes to play with numbers. He takes some integer number xx, writes it down on the board, and then performs with it n−1n−1 operations of the 阅读全文
摘要：
You are given an undirected graph consisting of nn vertices and mm edges. Your task is to find the number of connected components which are cycles. He 阅读全文