本文共 1805 字，大约阅读时间需要 6 分钟。

?????????????????????????????n?????n?3??????????n??????????????????????????????????????????153?370?371?407?

?????????

????????????????????????

??????

long start = (long) Math.pow(10, n - 1);
long end = (long) Math.pow(10, n) - 1;

for (long i = start; i <= end; i++) {
    // ????????????
    if (isWater???(i, n)) {
        System.out.println(i);
    }
}

while (num != 0) {
    temp = num % 10;
    sum += Math.pow(temp, n);
    num = num / 10;

if (sum == num) {
    System.out.println("?????" + num);
}

????

public class Water??? {
    public static void main(String[] args) {
        int n = 3;
        System.out.println("???????");
        searchWaterSsus(n);
        System.out.println("???????");
        n = 4;
        searchWaterSsus(n);
        System.out.println("???????");
        n = 5;
        searchWaterSsus(n);
    }
    private static void searchWaterSsus(int n) {
        long start = (long) Math.pow(10, n - 1);
        long end = (long) Math.pow(10, n) - 1;
        for (long num = start; num <= end; num++) {
            long sum = 0;
            long temp = 0;
            // ?????????n????
            do {
                temp = num % 10;
                sum += (long) Math.pow(temp, n);
                num /= 10;
            } while (num != 0);
            if (sum == num) {
                System.out.println(num);
            }
        }
    }
}

????

????????????????????????

• ???????153, 370, 371, 407
• ???????1634, 8208, 9474
• ???????...
• ???????????????

???????????????????????????