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public class Solution {
    public boolean isHappy(int n) {
        Set<Integer> set = new HashSet<Integer>();
        while (n != 1) {
            int temp = n;
            int sum = 0;
            while(temp != 0) {
                int digital = temp % 10;
                sum += digital * digital;
                temp /= 10;
            }
            if(!set.add(sum)) return false;
            n = sum;
        }
        return true;
    }
}

int digitSquareSum(int n) {
    int sum = 0, tmp;
    while (n) {
        tmp = n % 10;
        sum += tmp * tmp;
        n /= 10;
    }
    return sum;
}

bool isHappy(int n) {
    int slow, fast;
    slow = fast = n;
    do {
        slow = digitSquareSum(slow);
        fast = digitSquareSum(fast);
        fast = digitSquareSum(fast);
    } while(slow != fast);
    if (slow == 1) return 1;
    else return 0;
}

public class Solution {
    public boolean isHappy(int n) {
     if(n==1||n==7||n==10) return true;
     if(n<10) return false;
     int sum=(int)Math.pow(n%10,2);
     while(n>=10){
         n/=10;
         sum+=(int)Math.pow(n%10,2);
     }
     return isHappy(sum);
    }
}