LeetCode 771. 宝石与石头Jewels and Stones

这篇博客介绍了LeetCode上的771题——宝石与石头。文章通过分析题目,提出利用ASCII码和数组优化搜索,将时间复杂度降低到O(n+m),并给出了具体的C++解决方案。

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题目描述

You’re 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

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