152. Happy Number
EasyCycle Detection
Replace n by the sum of the squares of its digits repeatedly. If it reaches 1, n is happy; otherwise it loops forever. Print YES or NO.
Input format
A single integer n.
Output format
YES or NO
Example 1
Input
19
Output
YES
Example 2
Input
2
Output
NO
Constraints
1 ≤ n ≤ 10⁹
Read input from standard input and print the answer to standard output. Your code is judged against 5 test cases, most of them hidden.
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