The HTML version of the statement is not available.
About statements
The official statement of a problem is always the one
in the PDF document. The HTML version of the statement
is also given to help you, but may contain some content
that is not well displayed. In case of doubt, always use the PDF.
Public test cases
Input
1 2 3
4 5 6
7 8 9
Output
This is a valid sudoku
Input
1 2 3
4 5 6
7 8 9
Output
This is a valid sudoku
Input
1 1 2
3 4 5
5 6 7
Output
This is an invalid sudoku. Missing numbers are:
8
9
Input
1 1 2
3 4 5
5 6 7
Output
This is an invalid sudoku. Missing numbers are:
8
9