版权声明：版权归Ordinarv所有 https://blog.csdn.net/ordinarv/article/details/82225864
部分和 https://blog.csdn.net/stack_queue/article/details/53385952
https://blog.csdn.net/qq_40763929/article/details/81629800
五道：http://codeup.cn/contest.php?cid=100000608
https://blog.csdn.net/qq_39826163/article/details/81261338
奇偶剪纸
http://acm.hdu.edu.cn/showproblem.php?pid=1010
https://blog.csdn.net/chaiwenjun000/article/details/45918989