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Re: memory game

Nov 20th, 2008

So you want to populate the board with random numbers in the range of [0, 18) and disallow more than two of a kind? I'd say use a frequency table for the range since it's small, and repeat getting the random number until you find one that doesn't go beyond the limit:

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#include <cstdlib>
#include <iomanip>
#include <iostream>
 
int main()
{
  using namespace std;
 
  int board[6][6];
  int freq[18] = {0};
 
  for ( int i = 0; i < 6; i++ ) {
    for ( int j = 0; j < 6; j++ ) {
      int r;
 
      do
        r = rand() % 18;
      while ( freq[r] >= 2 );
 
      ++freq[r];
      board[i][j] = r;
    }
  }
 
  for ( int i = 0; i < 6; i++ ) {
    for ( int j = 0; j < 6; j++ )
      cout<< left << setw ( 3 ) << board[i][j];
    cout<<'\n';
  }
}
#include <cstdlib>
#include <iomanip>
#include <iostream>

int main()
{
  using namespace std;

  int board[6][6];
  int freq[18] = {0};

  for ( int i = 0; i < 6; i++ ) {
    for ( int j = 0; j < 6; j++ ) {
      int r;

      do
        r = rand() % 18;
      while ( freq[r] >= 2 );

      ++freq[r];
      board[i][j] = r;
    }
  }

  for ( int i = 0; i < 6; i++ ) {
    for ( int j = 0; j < 6; j++ )
      cout<< left << setw ( 3 ) << board[i][j];
    cout<<'\n';
  }
}

The frequency table holds a count of all of the values in your range.

I'm here to prove you wrong.