preferably without using externals, can anyone tell me how to do this: ********************* input: 0, 3, 5, 10 output: 1, 2, 3, 4 ********************* input: 10, 5, 3, 0 output: 4, 3, 2, 1 ********************* input: 10, 3, 0, 5 output: 4, 2, 1, 3 *********************