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I suggest you to change the number when their is any cavity to any negative number (let us change cavity a[i][j] to value -1) and then while printing you print the value 'X' in place of that negative number.
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I suggest you to change the number when their is any cavity to any negative number (let us change cavity a[i][j] to value -1) and then while printing you print the value 'X' in place of that negative number.