A company

wants to evaluate employee records so as to lay off some of them: the most

recently hired employees are laid off first

We have to determine the zero patient for a

virus spreading

An operating system is to process requests for computer resources by allocating the resources in the order they are requested.  

A program

to solve a maze is to backtrack to an earlier position (the last place where a

choice was made) when a dead-end position is reached