title: What dos count[i]++ mean
body: <p>Hello I came across this explanation about Finding first non repeating number in an array.
  <a href="http://www.geeksforgeeks.org/given-a-string-find-its-first-non-repeating-character/" rel="nofollow">http://www.geeksforgeeks.org/given-a-string-find-its-first-non-repeating-character/</a>
  In this explanation ,  I did not understand what this means </p>
  
  <pre><code>count[*(str+i)]++;  or count[index]++;
  </code></pre>
  
  <p>Can anyone please help me understand this </p>