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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数据挖掘导论
Pang-Ning Tan, Michael Steinbach / 范明 范宏建 / 人民邮电出版社 / 2006-01-01 / 49.00元
本书全面介绍了数据挖掘的理论和方法，旨在为读者提供将数据挖掘应用于实际问题所必需的知识。本书涵盖五个主题：数据、分类、关联分析、聚类和异常检测。除异常检测外，每个主题都包含两章：前面一章讲述基本概念、代表性算法和评估技术，后面一章较深入地讨论高级概念和算法。目的是使读者在透彻地理解数据挖掘基础的同时，还能了解更多重要的高级主题。此外，书中还提供了大量示例、图表和习题。 本书适合作为......一起来看看 《数据挖掘导论》 这本书的介绍吧!
