1 题目描述
链接地址：https://leetcode.com/problems/happy-number/
2 解决方案
java代码如下：
public class Solution {
public boolean isHappy(int n) {
int result = 0;
ArrayList<Integer> list = new ArrayList<Integer>();
boolean isLucky = false;
if (n <= 0) {
return isLucky;
}
while (true) {
int sum = 0;
int num = n;
while (num > 0) {
int temp = num%10;
num = (num -temp)/ 10;
sum = sum + temp * temp ;
}
result = sum;
if (result ==1 ) {
isLucky = true;
break;
}
else if(list.contains(result)) {
isLucky = false;
break;
}else {
n = result;
list.add(result);
}
}
return isLucky;
}
}