huawei 2019 code-craft preliminary contest
一些重要的参考网站和参赛经验：
http://www.mamicode.com/info-detail-1288199.html
https://www.cnblogs.com/zhuting/p/6869752.html
https://blog.csdn.net/EbowTang/article/details/51220053
https://blog.csdn.net/mmy1996/article/details/52263223
https://blog.csdn.net/EbowTang/article/details/51212846