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copied!<p>Maintain a <a href="http://docs.oracle.com/javase/7/docs/api/java/util/BitSet.html" rel="nofollow"><strong><code>java.util.BitSet</code></strong></a> reference in your class <code>myTeams</code> and instantiate it with a number equaling the number of teams. By default all values are <em>unset</em> (false) in the beginning.</p> <p>As a team tries to play a match with another team in the <code>aoTeams</code> check the value in the <code>BitSet</code> at the array index of the opponent. If it's not set let it play and <em>set</em> the value at that index. Do the same for the other team as well.</p> <p>An example implementation might look like:</p> <pre><code>class Team { String teamName; int wins; int losses; BitSet playRecord; public Team(String name, int size) { this.teamName = name; playRecord = new BitSet(size); } public boolean hasPlayed(int index) { return playRecord.get(index); } public void finishedPlaying(int index) { playRecord.set(index); } } </code></pre> <p>And this is how you use it:</p> <pre><code>public static void main(String[] args) { int size = 9; Team aoTeams[] = new Team[size]; aoTeams[0] = new Team("Utah", size); aoTeams[1] = new Team("USC", size); play(aoTeams, 0, 1); } private static void play(Team[] teams, int indexA, int indexB) { if (teams[indexA].hasPlayed(indexB)) { // Teams have already played together } else { // Teams playing for the first time teams[indexA].finishedPlaying(indexB); teams[indexB].finishedPlaying(indexA); } } </code></pre>

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