Thread: Finding an array of unique values within a 2D array

Hi! I am new to C programming. I am trying to write a program that involves finding unique values in a 2D array and saving them in a separate array. The values in the 2D array are not sorted. Also, a value and its negative should be considered the same. For example, if the 2D array is

Code:

int array[][] = {1, 2, 3}
                                        {-3, 4, 1} 
                                        {-1, 2, 5}
                                        {5, 2, 6}
//The array of the unique values should be
unique[] = {1, 2, 3, 4, 5, 6}

Please explain the code that would carry out this function. Thank you!