问题 1624: 蓝桥杯算法训练VIP-完数

import java.util.Scanner;

public class Prog1624 {

public static void main(String[] args) throws Exception {

Scanner scan = new Scanner(System.in);

int n = scan.nextInt();

int sum = 0;

String b = null;

for (int i = 1; i <= n / 2 + 1; i++) {

if (n % i == 0) {

sum += i;

if (sum == n && i == n / 2)

b = "yes";

else

b = "no";

}

}

System.out.println(b);

}

}