problem
202. Happy Number
code
class Solution {
public:
bool isHappy(int n) {
while(n!=1 && n!=4)
{
int sum = 0;
int tmp = n;
while(tmp)
{
sum += pow(tmp%10, 2);//
tmp = tmp / 10;//
}
n = sum;
}
return 1==n;
}
};
1. Leetcode_Happy Number;
2. GrandYang_cnblogs;