terrain.cin

CGAL is a collaborative effort of several sites in Europe and Israel. The goal is to make the most i

1 2 3 1
4 5 6 1
1 2 3 1
7 8 9 1
3 5 6 1
7 8 3 1
9 6 7 1
5 6 3 1
4 3 8 1
5 5 8 1
7 4 2 1