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Happy_Numbers.cpp

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class Solution {

public:

bool isHappy(int n) {

unordered_map <int, bool> visited;

while(n != 1) {

if(visited[n]) return false;

visited[n] = true;

int tmp = n;

n = 0;

while(tmp) {

n += pow((tmp % 10), 2);

tmp /= 10;

}

}

return true;

}

};