PlaySudoku.us
Medium · Puzzle #13
2
4
6
1
5
7
6
8
9
3
4
8
1
7
9
3
8
8
1
6
7
3
9
2
6
9
1
6
4
7
3
Sudoku can be expressed as an integer linear program — a branch of optimization mathematics used in logistics and finance.
Sudoku can be expressed as an integer linear program — a branch of optimization mathematics used in logistics and finance.
Set theory provides the formal foundation for Sudoku's rules: each digit must appear exactly once per set.
Set theory provides the formal foundation for Sudoku's rules: each digit must appear exactly once per set.