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Problem Number - Problem Name
- [Problem Link]
Summary of the problem statement goes here.
Explanation of the ideas behind the solution goes here.
- Any points one can easily overlook?
- The correct way to understand ambiguous formulations?
- Anything special to note about the problem.
3 7 4 13
Case #1: 7 is a Happy number. Case #2: 4 is an Unhappy number. Case #3: 13 is a Happy number.
- Reference 1
Categories here, use the form [[Category:UVa Online Judge|10591]] [[Category: Category Name]], see Categories for a list