We define the Perfect Number is a positive integer that is equal to the sum of all its positive divisors except itself. Now, given an integer n, write a function that returns true when it is a perfect number and false when it is not. Example: Input:…

We define the Perfect Number is a positive integer that is equal to the sum of all its positive divisors except itself. Now, given an integer n, write a function that returns true when it is a perfect number and false when it is not. Example: Input:…

原题链接在这里:https://leetcode.com/problems/perfect-number/#/description 题目: We define the Perfect Number is a positive integer that is equal to the sum of all its positive divisors except itself. Now, given an integer n, write a function that returns true…

Validate if a given string is numeric. Some examples:"0" => true" 0.1 " => true"abc" => false"1 a" => false"2e10" => true Note: It is intended for the problem statement to be ambiguous. You…

对于一个 正整数,如果它和除了它自身以外的所有正因子之和相等,我们称它为“完美数”.给定一个 正整数 n, 如果他是完美数,返回 True,否则返回 False示例:输入: 28输出: True解释: 28 = 1 + 2 + 4 + 7 + 14注意:输入的数字 n 不会超过 100,000,000. (1e8)详见:https://leetcode.com/problems/perfect-number/description/ C++: class Solution { public: b…

Given N axis-aligned rectangles where N > 0, determine if they all together form an exact cover of a rectangular region. Each rectangle is represented as a bottom-left point and a top-right point. For example, a unit square is represented as [1,1,2,2…

题意: 给出一个整数n,判断其是否为幸运数. 规则是,将n按十进制逐位拆出来后,每个位各自进行取平方,再将这些平方数求和作为新的数字n.若最后n=1,就是幸运数. 思路: 计算例子:n=47,接着n=4*4+7*7=65,接着n=6*6+5*5=61,接着.... 注意有可能陷入无限循环,就是迭代的过程产生了一个环路,即n又重复出现了. class Solution { public: bool isHappy(int n) { unordered_set<int> sett; ) { if(…

We define the Perfect Number is a positive integer that is equal to the sum of all its positive divisors except itself. Now, given an integer n, write a function that returns true when it is a perfect number and false when it is not. Example: Input:…

这是悦乐书的第249次更新,第262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116题(顺位题号是507).我们定义Perfect Number是一个正整数,它等于除了它自己之外的所有正除数之和.现在,给定一个整数n,编写一个函数,当它是一个完美数字时返回true,否则返回false.例如: 输入:28 输出:true 说明:28 = 1 + 2 + 4 + 7 + 14 注意:输入数字n不会超过100,000,000.(1E8) 本次解题使用的开发工具是ec…

作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.cn/ 目录 题目描述 题目大意 解题方法 日期 题目地址:https://leetcode.com/problems/perfect-number/#/description 题目描述 We define the Perfect Number is a positive integer that is equal to the sum of all its positive divisors…