[C++] Rock! Paper! Scissors! Fight!

This C++ exercise implements a full game of Rock, Paper, Scissors against an AI opponent. Check the Rock! Paper! Scissors! Fight! project on GitHub.
Round input

You must first insert the desired number of rounds, which must be an odd number and at least one.
If you win (or lose) at least `round / 2 + 1` rounds, the game ends with a clear winner (or loser).

Move input

The game allows three moves:

- 'R' or 'r': ROCK - wins over SCISSORS
- 'P' or 'p': PAPER - wins over ROCK
- 'S' or 's': SCISSORS - wins over PAPER

Input validation

Input is validate so any wrong value will result in an error message and a request to reenter it.

Game round

The AI is initialized with [random](http://www.cplusplus.com/reference/random/) and will each round pick one of the three available moves.

If your move is the winning one, you get a point, otherwise the AI gets a point.
If you choose the same move, the round is a draw and must be played again.

When either you or the AI reaches the victory limit, the game ends even if there are rounds left.

Compiling and executing

Simply compile rps.cpp and execute it.

You could also use an online service such as onlinegdb