#702Easy#53 in Airbnb's list· asked at 17 companies
Happy Number
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What we know
Example 1
Input: n = 19 Output: true
1 + 81 = 82; 64 + 4 = 68; 36 + 64 = 100; 1 + 0 + 0 = 1.
Example 2
Input: n = 2 Output: false
Constraints
- •
1 <= n <= 2^31 - 1 - •
The process is guaranteed to either reach 1 or enter a cycle.