平衡数：对所有位的乘积判断是否是一个平方数。 public class Main { public static void main(String[] args) { Scanner in = new Scanner(System.in); while (in.hasNext()) { getValue(in.nextInt()); } } public static void getValue(int data) { String s = String.valueOf(data); int R = 1; for (int i = 0; i < s.length(); i++) { R = R * (s.charAt(i) - '0'); } int r = (int) Math.sqrt((double) R); if (r * r == R) System.out.println("YES"); else System.out.println("NO"); } }