title: calculate time complexity of nested for loops
body: <p>I am having trouble calculating the time complexity for these for loops:</p>
  
  <pre><code>for(int i=0; i&lt;len; i++){
      countOne++;
      for(int j=i/2; j&lt;len; j++){
          countTwo++;
          for(int k=i/2; k&lt;len; k++){
              countThree++;
          }
      }
  }
  </code></pre>
  
  <p>I don't understand how to calculate the time complexity for the 2 inner-most loops. </p>