LintCode: Happy Number
C++
class Solution {
public:
/**
* @param n an integer
* @return true if this is a happy number or false
*/
bool isHappy(int n) {
// Write your code here
int a, b;
if (n <= ) return false;
if (n < ) n = n*n;
while (n > ) {
a = ;
while (n) {
b = n%;
a += b*b;
n /= ;
}
n = a;
}
return n == ;
}
};
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