int multi[N][M]
multi[i][j]
multi[i][j - 1]
multi[i][j + 1]
j == 0
multi[i - 1][M - 1]
j == M - 1
multi[i + 1][0]
multi[2][3] == 1
multi[1][1] == -99
multi[3][2] == ???
multi[0][4] == 45
dati[N][M]
*
&