WILL的专栏

http://acm.hdu.edu.cn/webcontest/contest_showproblem.php?pid=1002&ojid=0&cid=5381&hide=0 Problem Description The doggie found a bone in an ancient maze, which fascinated him a lot. However, wh

http://acm.hdu.edu.cn/webcontest/contest_showproblem.php?pid=1004&ojid=0&cid=5442&hide=0 Problem Description Given three strings, you are to determine whether the third string can be formed by