当然,你要是把int范围内的5个Perfect Number(第5个是33550336)都找出来了,直接做判断也行。 publicbooleancheckPerfectNumber3(intnum){int[] primes = {2,3,5,7,13};for(intp: primes) {if((1<< (p -1)) * ((1<< p) -1) == num) {returntrue; } }returnfalse; } 05 小结 算法专题目前...
大神的代码比较简约一些,思路都是一样的:69ms 277K importjava.util.Scanner; publicclassMain{ publicstaticvoidmain(String[] args){ Scanner in =newScanner(System.in); while(in.hasNext()){ intN = in.nextInt(); intcount =0; for(inti=1;i<=N;i++){ intsum=0; for(intj=1;j<i;j++){...
LeetCode算法题-Perfect Number(Java实现) 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,...
Learn how to check if a given number is a perfect number in Java with this simple guide and example code.
LeetCode Perfect Number 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 when ...
Write a Java program that categorizes integers between 1 and 10,000 as Abundant, Deficient, and Perfect.In number theory, an abundant number is a number for which the sum of its proper divisors is greater than the number itself. Example : The first few abundant numbers are: 12, 18, 20...
java 我们只需要找到小于sqrt(n)sqrt(n)的约数就能把数n的所有约数求取出来了。 publicclassSolution{/***@param num:aninteger*@return: returns true when it isaperfect number and false when it is not*/public boolean checkPerfectNumber(intnum) {// write your code hereif(num==1)returnfalse;int...
Output the Result:Based on the above check, we print whether the number is a perfect square or not. Java Code to Check Whether a Number is a Perfect Square import java.util.Scanner; public class PerfectSquare { // Method to check whether the number is a perfect square ...
Write a Java program to test if a given number (positive integer) is a perfect square or not. Input number: 3 Output: 1 2 3 8 9 4 7 6 5 Visual Presentation:Sample Solution:Java Code:// Import Scanner class from java.util package for user input import java.util.*; // Main ...
题意:计算整数N是否为Perfect Number,其定义为满足其所有因数(不包括自身)的和与该数相等; 解法:只需要计算其所有因数并求和后与此数相比较即可,这里需要注意的是给出的整数N可能为负数或零,而Perfect Number要求是正整数; Java class Solution { public boolean checkPerfectNumber(int num) { ...