Write an algorithm to determine if a number is "happy". A happy number is a number defined by the following process: Starting with any positive ...

Write an algorithm to determine if a number is happy. A happy number is a number defined by the following process: Starting with any positive ...

Happy Number Write an algorithm to determine if a number is "happy". A happy number is a number defined by the following process: Starting with any ...

这是悦乐书的第188次更新，第190篇原创 01 看题和准备 今天介绍的是LeetCode算法题中Easy级别的第47题（顺位题号是202）。编写算法以确定数字是否“幸福”。 幸福数字是由以下过程定义的数字：从任何正整数开始，将数字替换为其数字的平方和，并重复该过程，直到最后数字等于 ...

思想： 　　对输入数据 把每个位数平方求和 　　得到结果如果是1 就返回真 否则 对这个结果递归 啥时候事后返回假： 　　返回假 说明进入无限循环了。 　　啥时候会无限循环？ 　　　　 ...

Write a program to check whether a given number is an ugly number. Ugly numbers are positive numbers whose prime factors only include 2, 3, 5. ...

A strobogrammatic number is a number that looks the same when rotated 180 degrees (looked at upside down). Write a function to determine ...

Write a program to find the nth super ugly number. Super ugly numbers are positive numbers whose all prime factors are in the given prime list ...