内容简介：You are given strings J representing the types of stones that are jewels, and S representing the stones you have. Each character in S is a type of stone you have. You want to know how many of the stones you have are also jewels.The letters in J are guaran
You are given strings J representing the types of stones that are jewels, and S representing the stones you have. Each character in S is a type of stone you have. You want to know how many of the stones you have are also jewels.
The letters in J are guaranteed distinct, and all characters in J and S are letters. Letters are case sensitive, so “a” is considered a different type of stone from “A”.
Example 1:
Input: J = “aA”, S = “aAAbbbb”
Output: 3
Example 2:
Input: J = “z”, S = “ZZ”
Output: 0
Note:
S and J will consist of letters and have length at most 50.
The characters in J are distinct.
return J.reduce(0) { sum, j in
sum + S.filter({$0 == j}).count
}
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A=B
Marko Petkovsek、Herbert S. Wilf、Doron Zeilberger / AK Peters, Ltd. / 1996-01 / USD 49.00
At some point, this book describes methods of solving the problem raised by Donald E. Knuth in the classical book "The Art of Computer Programming, Volume 1: Fundamental Algorithms". The main purpo......一起来看看 《A=B》 这本书的介绍吧!
