[UVA][DLX][舞鏈] 1309 - Sudoku
A Sudoku grid is a
16 x 16 grid of cells grouped in sixteen 4 x 4 squares, where some cells are filled with letters from A to P
(the first 16 capital letters of the English alphabet), as shown in
figure 1a. The game is to fill all the empty grid cells with letters
from ...
