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 ...

這是悅樂書的第188次更新，第190篇原創 01 看題和准備 今天介紹的是LeetCode算法題中Easy級別的第47題（順位題號是202）。編寫算法以確定數字是否“幸福”。 幸福數字是由以下過程定義的數字：從任何正整數開始，將數字替換為其數字的平方和，並重復該過程，直到最后數字等於 ...

思想： 　　對輸入數據 把每個位數平方求和 　　得到結果如果是1 就返回真 否則 對這個結果遞歸 啥時候事后返回假： 　　返回假 說明進入無限循環了。 　　啥時候會無限循環？ 　　　　 ...

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 ...