Returns maximum XOR value of a subarray in arr[0..n-1]

this function is used to print the resultant matrix

Finds the maximum XOR ending with last number in prefix XOR 'pre_xor' and returns the XOR of this maximum with pre_xor which is maximum XOR ending wit

this function recursively checks for every word that can align vertically in one loop and in another loop it checks for those words that can align hor

Returns the maximum peice of cake that can be taken starting from x,y