HDU 1021: http://www.cnblogs.com/lzj-0218/archive/2013/05/14/3078581.html
HDU 2035: http://www.cnblogs.com/lzj-0218/archive/2013/05/14/3078609.html
HDU 2044: http://www.cnblogs.com/lzj-0218/p/3247277.html
HDU 2089: http://www.cnblogs.com/lzj-0218/archive/2013/04/30/3051565.html
HDU 2098: http://www.cnblogs.com/lzj-0218/archive/2013/05/09/3068982.html
HDU 2099: http://www.cnblogs.com/lzj-0218/archive/2013/04/30/3051547.html
HDU 3555: http://www.cnblogs.com/lzj-0218/archive/2013/04/30/3051556.html
HDU 4570: http://www.cnblogs.com/lzj-0218/p/3219800.html
HDU 4611: http://www.cnblogs.com/lzj-0218/p/3219761.html
HDU 4627: http://www.cnblogs.com/lzj-0218/p/3228018.html
HDU 4628: http://www.cnblogs.com/lzj-0218/p/3229452.html
HDU 4632: http://www.cnblogs.com/lzj-0218/p/3231741.html
HDU 4639: http://www.cnblogs.com/lzj-0218/p/3230695.html
HDU 4642: http://www.cnblogs.com/lzj-0218/p/3230730.html
HDU 4648: http://www.cnblogs.com/lzj-0218/p/3241763.html
HDU 4662: http://www.cnblogs.com/lzj-0218/p/3246903.html
HDU 4678: http://www.cnblogs.com/lzj-0218/p/3270870.html
HDU 4690: http://www.cnblogs.com/lzj-0218/p/3270846.html
HDU 4705: http://www.cnblogs.com/lzj-0218/p/3276439.html