Repeats

IN JAVA

Problem: Write a method that will return a list of all #s in the matrix that repeat. Numbers should be placed in the list based on the order that the first instance of that digit appears.

Data: A matrix will be passed in. The matrix may be empty but will not be null.

Output: Return a list of all values that repeat.

Sample Data [ 1, 2, 3, 0 ] , [ 1, 0, 0, 1, 1 ] [ 1, 2, 3, 0 ] , [ 0, 1, 0, 1, 1 ] [ 4, 15, 1 ] , [ 73, 2 ] [ 7, 7, 7 ], [ -12, 30 ] , [ 0 ] Sample Output [1, 0] [1, 0] [] [7]

List go( int[][] mat ) { // your code goes here }

please use the given format