acre
The acre is a unit of land area used in the imperial and US customary systems. It is traditionally defined as the area of one chain by one furlon ......
How much of each year do spiders killing insects?
Why, you may wonder, should spiders be our friends? Because they destroy so many insects, and insect ......
acquire
An acquired taste is an appreciation [鉴赏] for something unlikely to be enjoyed by a person who has not had substantial [相当大的] exposure t ......
Given a string S and a string T, count the number of distinct subsequences of T in S.
A subsequence of a string is a new string which is formed from t ......