input a[i][j]
better input a[n][n]
change 'int' to 'double'
define dunction 'func'

Signed-off-by: JIANG Di <dd19941105@gmail.com>
first elimination

Signed-off-by: JIANG Di <dd19941105@gmail.com>
first elimination bug fixed

Signed-off-by: JIANG Di <dd19941105@gmail.com>
The process of Elimination done

Signed-off-by: JIANG Di <dd19941105@gmail.com>