Thanks Michael, this is a general system, I need to apply this design as a test. These are the requirements I have. Your help will be appreciated. Thanks.

Since that the array size is n and the values are from 1 to n-1

The issue is: You are given an array of integers of size n containing values in the range 1 to n-1. Obviously there’s at least one duplicate value in this array. Please let me know the algorithm for finding one such duplicate value. Thanks.

The issue is: You are given an array of integers of size n containing values in the range 1 to n-1. Obviously there’s at least one duplicate value in this array. Please let me know the algorithm for finding one such duplicate value. Thanks.

I need to design a web-facing concert ticket reservation system. I would like to know the main objects required for the design and their major methods. Please specify any non-obvious data structures or algorithms used. Thanks.

What principles should be followed in order to design and implement a scalable software system? How would you make it reliable? Any ideas, references will kindly accepted. Thanks.

Thank you but I need the code without calling any library function.

Thank you but I need the code without calling any library function.

I would like to know how to convert from integer to a string, actually I would like to know how to implement the function 'itoa()'. Please provide C code. Thanks.