int array[12] = {0};
..
int gennum()
{
   while(1)
   {
        int n = rand() % 12 + 1;
        if( array[n-1] < 4)
        {
            array[n-1]++;
            return n;
        }
 
}

class Deck{
public:
   list<int> cards;  // cards in the deck
 
   void init(){      // puts all 52 cards in deck
      cards.clear(); // start with an empty deck
 
      for(int i = 0; i < 52; i++){  // fill it with 52 cards
         cards.push_back((i/4)+1);  // numbers 1-13 only
         }
      }
 
   void shuffle(){
      // .. shuffle deck randomly here
      }
 
   int getTopCard(){// deal a card - i.e. get top card, remove it from the deck
      int ret = 0;
 
      if(cards.size() > 0){
         ret = cards.front();
         cards.erase(cards.begin();
         }
 
      return ret;    // return 0 if no more cards, or the top card
      }
 
   Deck(){           // constructor
      init();           // fill the deck
      shuffle();     // shuffle it
      }
   };

int main(){
   Deck myDeck;   // create a shuffled deck
 
   cout << "Top card is " << myDeck.getTopCard() << endl;
   }

{
    int deck[52];    // array of cards;
    srand(time(0));
 
    do 
	{    
        // Shuffles cards
        for (int index=0; index<(52-1); index++) 
		{
            int r = index + (rand() % (52-index));
            int temp = deck[index]; deck[index] = deck[r]; deck[r] = temp;
        }
    }
}

#include <vector>
using namespace std;

#include <vector>
using namespace std;