Crossword puzzle

in this code what is the use or when this code is applied matrix[0][0] = ‘@’;

and why only matrix[0][0] = ‘@’; and not matrix[0][1] and so on

hello @Somith
they are using @ as an indicator .
if mat[0][0] !=@ it indicates the word is matched perfectly and we can proceed furthur

otherwise we should try another word

why only mat[0][0] why not any other index ?
it really doesnt matter, u can place it anywhere but makesure u know where u have placed ,
for checking mat[i][j]!=@.

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