How to correctly compare the columns of a matrix?

Question

Java

Hello, please help me to draw up the logic of the solution - you need to compare the columns in a two-dimensional array, if they are equal, then leave only the first of the matching columns. (Coinciding columns are columns in which all corresponding elements are equal to each other). Thanks in advance for your help!

Answer 1

The logic is very simple:
Compare columns in a two-dimensional array, if they are equal then leave only the first of the matching columns. (Coinciding columns are columns in which all corresponding elements are equal to each other).
You're welcome.