title: Can't correctly setup classpath
body: <p>I'm trying to compile the following code:</p>
  
  <pre><code>package week1;
  
  public class ThreeSum {
      public static int count(int[] a) {
          // count triples that sum to 0
          int count = 0;
          for (int i = 0; i&lt;a.length; i++) {
              for (int j = i+1; j &lt; a.length; j++) {
                  for (int k = j+1; k &lt; a.length; k++) {
                      if (a[i] + a[j] + a[k] == 0) {
                          count++;
                      }
                  }
              }
          }
          return count;
      }
  
      public static void main(String[] args) {
          int[] a = In.readInts(args[0]);
          StdOut.println(count(a));
      }
  }
  </code></pre>
  
  <p>This code is in the ThreeSum.java file in week1 folder. Both classes "In" and "StdOut" are in the package stdlib.jar which is in the <code>./lib</code> folder. 
  I've always used an IDE and now decided to use a command line. So on my </p>
  
  <pre><code>javac -cp .:lib/stdlib.jar week1/ThreeSum.java
  </code></pre>
  
  <p>and other variants of classpath parameters it returns an error:</p>
  
  <pre><code>week1\ThreeSum.java:20: error: cannot find symbol
          int[] a = In.readInts(args[0]);
                    ^
    symbol:   variable In
    location: class ThreeSum
  
  week1\ThreeSum.java:21: error: cannot find symbol
          StdOut.println(count(a));
          ^
    symbol:   variable StdOut
    location: class ThreeSum
  </code></pre>
  
  <p>How a proper -cp option should look like in my case?</p>