摘要： 【题目】 Given an array nums of n integers and an integer target, are there elements a, b, c, and d in nums such that a + b + c + d = target? Find all uni 阅读全文

摘要： 【题目】 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 阅读全文