完全数(Perfect number),又称完美数或完备数,是一些特殊的自然数.它所有的真因子(即除了自身以外的约数)的和(即因子函数),恰好等于它本身.如果一个数恰好等于它的因子之和,则称该数为"完全数". for ( int i = 2; i <= 1000; i++) { int sum = 0;//定义一个变量用于计算累加的因子之和,每次外层循环初始化 for (int j = 1; j < i/2+1; j++) { if (i % j == 0) { sum +…
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:…
package 第三章; import java.util.Scanner; public class 蛇形填数 { public static void main(String[] args) { // TODO Auto-generated method stub Scanner in=new Scanner(System.in); int n=in.nextInt(); int a[][]=new int[n][n]; int x=0,y=n-1; int t=1; a[0][n-1]=…
1 前言 最近学习Power HAL方面相关知识,透过Power HAL 去配置CPU的Freq需要先确定 CPU 核数.便先了解如何获取 Android CPU 核数. 2 Java层获取方式 // 获取 CPU 核数 Runtime.getRuntime().availableProcessors() 3 C++层获取方式 #include <unistd.h> // 获取CPU核心数(包含禁用的) long result = sysconf(_SC_NPROCESSORS_CONF);…
问题描述: 把只包含因子2.3和5的数称作丑数(Ugly Number).例如6.8都是丑数,但14不是,因为它包含因子7. 习惯上我们把1当做是第一个丑数.求按从小到大的顺序的第N个丑数. 思路1:(显然是比较耗时的) 直接去判断每个整数是不是丑数,然后找到第N个小的数.(牛客网提交超时) public int GetUglyNumber_Solution(int index) { if(index <= 0){ return 0; } int number = 0; int found =…
题目: Given a complete binary tree, count the number of nodes. Definition of a complete binary tree from Wikipedia: In a complete binary tree every level, except possibly the last, is completely filled, and all nodes in the last level are as far left a…
import java.util.HashMap; import java.util.Iterator; import java.util.Map; import java.util.Scanner; public class Main { public static void main(String[] args) { Scanner sc = new Scanner(System.in); int n = sc.nextInt(); int[] array = new int[n]; for…
