Geeksforgeeks Solution For " Happy Number "

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Problem :- Happy Number 

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Solution :- 

#include <bits/stdc++.h>
using namespace std;
int numSquareSum(int n)
{
    int squareSum = 0;
    while (n)
    {
        squareSum += (n % 10) * (n % 10);
        n /= 10;
    }
    return squareSum;
}
bool isHappynumber(int n)
{
    int slow, fast;
    slow = fast = n;
    do
    {
        slow = numSquareSum(slow);
        fast = numSquareSum(numSquareSum(fast));

    }
    while (slow != fast);
    return (slow == 1);
}
int main()
{
    int t;
    cin>>t;
    while(t--)
    {
    int n;
    cin>>n;
    if (isHappynumber(n))
        cout <<"1\n";
    else
        cout <<"0\n";
    }
    return 0;
}

Output:-