It's highly unlikely that a candidate would recognize this as Dijkstra's Dutch National Flag problem ( http://www.drdobbs.com/cpp/a-classic-example-that-off-the

It's highly unlikely that a candidate would recognize this as Dijkstra's Dutch National Flag problem ( http://www.drdobbs.com/cpp/a-classic-example-that-off-the-end-itera/240168707 http://www.drdobbs.com/cpp/a-classic-example-that-off-the-en... ).