各种大佬博客

https://www.cnblogs.com/kuangbin/archive/2011/08/15/2139931.html    kuangbin博客

https://www.cnblogs.com/yjiyjige/p/3263858.html    KMP算法网址

https://www.cnblogs.com/fengziwei/p/7750849.html 背包

https://www.cnblogs.com/cuixiaohua/p/7373171.html  字符串截取

https://guides.github.com/activities/hello-world/ Github使用

https://www.cnblogs.com/acgoto/p/8583952.html 树状数组