Happy Number LeetCode Solution

Problem – Happy Number

Write an algorithm to determine if a number n is happy.

A happy number is a number defined by the following process:

• Starting with any positive integer, replace the number by the sum of the squares of its digits.
• Repeat the process until the number equals 1 (where it will stay), or it loops endlessly in a cycle which does not include 1.
• Those numbers for which this process ends in 1 are happy.

Return true if n is a happy number, and false if not.

Example 1:

Input: n = 19
Output: true
Explanation:
12 + 92 = 82
82 + 22 = 68
62 + 82 = 100
12 + 02 + 02 = 1

Example 2:

Input: n = 2
Output: false

Constraints:

• 1 <= n <= 231 - 1

Happy Number LeetCode Solution in Java

public boolean isHappy(int n) {
    Set<Integer> inLoop = new HashSet<Integer>();
    int squareSum,remain;
	while (inLoop.add(n)) {
		squareSum = 0;
		while (n > 0) {
		    remain = n%10;
			squareSum += remain*remain;
			n /= 10;
		}
		if (squareSum == 1)
			return true;
		else
			n = squareSum;

	}
	return false;

}

Happy Number LeetCode Solution in Python

def isHappy(self, n):
    mem = set()
    while n != 1:
        n = sum([int(i) ** 2 for i in str(n)])
        if n in mem:
            return False
        else:
            mem.add(n)
    else:
        return True

Happy Number LeetCode Solution in C++

class Solution {
public:
    bool isHappy(int n) {
        unordered_set<int> tmp;
        
        while(n != 1)
        {
            if(tmp.find(n) == tmp.end())
                tmp.insert(n);
            else
                return false;
            
            int sum = 0;
            while(n != 0)
            {
                sum += pow(n % 10,2);
                n = n / 10;
            }
            
            n = sum;
        }
        
        return true;
    }
};

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