摘要： 原题链接在这里：https://leetcode.com/problems/happy-number/ 题目： Write an algorithm to determine if a number is "happy". A happy number is a number defined by 阅读全文

摘要： 原题链接在此: https://leetcode.com/problems/isomorphic-strings/ 题目： Given two strings s and t, determine if they are isomorphic. Two strings are isomorphic 阅读全文