updated linked-list article

freeCodeCamp · May 30, 2016 · 7f7b0dd · 7f7b0dd
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     ```
 
+    Application
+
+    Timesharing problem solved by the operating system.
+
+    In a timesharing environment, the operating system must maintain a list of present users and must alternately allow each user to use a small portion of CPU time, one user at a time. The operating system will pick a user, let him/her use a small amount of CPU time and then move on to the next user.
+
+    For this application, there should be no NULL pointers unless there is absolutely no one requesting CPU time, i.e list is empty.
+
 **Basic Operations**
 
 1. Insertion