Write simple python/java program and also explain the logic because I am crying so much and not able to understand anything.

First Question: Size of the smallest subset with maximum Bitwise XOR in a 2-D matrix & return the smallest subset

a[1,1]^a[1,2] a[2,1]^a[2,2] a[1,1]^a[1,2] a[2,1]^a[2,2];

In Case of multi answer return the smallest subset

Time complexity O(n^2);