Working with 2D arrays is quite important. Here we will do swapping of column in a 2D array. You are given a matrix M or r rows and c columns. You need to swap the first column with the last column.
The first line of input contains T, the number of testcases. T testcases follow. Each testcase contains two lines of input. The first line contians r and c, separated by a space. The next line contains r*c elements of the matrix, separated by spaces.
For each testcase, in a new line, print the modified matrix.
Since this is a function problem, you don't need to take any input. Just complete the provided function interchange(int, int , int ) that take matrix, rows and columns as parameters.
1 <= T <= 100
1 <= r,c <= 100
1 2 3 4
4 3 2 1
6 7 8 9
4 2 3 1
1 3 2 4
9 7 8 6
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