http://m.baidu.com/ssid=0/from=844b/bd_page_type=1/uid=27BE9831C4DA27D5D65766922B1DB0C3/pu=sz%401321_1004%2Cusm%400%2Cta%40utouch_2_4.0__/w=0_10_poj+1003/t=wap/l=3/tc?ref=www_utouch&lid=12418412310758219271ℴ=2&vit=osres&tj=www_normal_2_0_10&m=8&sec=26021&di=e1c97cce19517d1c&bdenc=1&nsrc=DF44KgEptyoA_yixCFOxXnANedT62v3IJBaOMmBXATq5953ybrWxBdpzS7Gn3SfEVpGdciPQps-DhC8sQzEz7qQPe3g-ejVgznuPcfbwgRC2G_
https://github.com/liuguojun/OnlineJudge
http://blog.csdn.net/tanhaiyuan/article/details/6792103
http://hi.baidu.com/lewutian/item/ee7a114d773e32e21281da3b
