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#include <iostream>

#include <vector>

#include <algorithm>

#include <set>

using namespace std;

class Solution {

public:

bool isHappy(set<int>& appear, int n)

{

cout << n << endl;

if (n == 1)

return true;

else if (appear.find(n) != appear.end())

return false;

appear.insert(n);

int res=0;

while (n)

{

int temp = n%10;

res+=temp*temp;

n/=10;

}

return isHappy(appear, res);

}

bool isHappy(int n) {

set<int> appear;

return isHappy(appear, n);

}

};

int main()

{

Solution solution;

cout << solution.isHappy(19);

return 0;

}