title: Objective-C: Creating NSMutableDictionary or NSMutableArray
body: <p>For my iPhone app, I want to manage values either in <code>NSMutableDictionary</code> or <code>NSMutableAarray</code>.</p>
  
  <p>I want to store rating in this format</p>
  
  <pre><code>round   player1  player2
    1        6        8
    2        7        9
  --        --        --
  </code></pre>
  
  <p>Here in my case number of round will be fix value suppose 10, and total player would be 2 that is also fix.</p>
  
  <p>But user can submit their score in any random order but in single button click. Means  </p>
  
  <pre><code> score for round  "10" for both the player   enter
   score for round  "2"  for both the player   enter
  </code></pre>
  
  <p>How can I manage dictionary or array which could help me in retrieving them again easily?</p>