执行输出:
ewuming/tmp>g++ -o b.out sort_list.cc
ewuming/tmp>./b.out
list's length: 8 list's content is
hello tree world my I computer tree forest
list's length: 8 list's content is
computer forest hello world tree tree my I
list's length: 8 list's content is
I my tree tree hello world forest computer
list's length: 8 list's content is
I my tree tree hello world forest computer