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https://leetcode.com/problems/jewels-and-stones/description/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 t...

https://leetcode.com/problems/reverse-integer/description/  Given a 32-bit signed integer, reverse digits of an integer.Example 1:Input: 123 Output: 321 Example 2:Input: -123 Output: -321 Example 3:In...

给定一个整数数组和一个目标值，找出数组中和为目标值的两个数。你可以假设每个输入只对应一种答案，且同样的元素不能被重复利用。示例:给定 nums = [2, 7, 11, 15], target = 9 因为 nums[0] + nums[1] = 2 + 7 = 9 所以返回 [0, 1] Python3:class Solution: def twoSum(self, nums, ta...