piaocoder:CSDN认证博客专家
博客地址:https://blog.csdn.net/piaocoder
piaocoder:CSDN认证博客专家
博客地址:https://blog.csdn.net/piaocoder
Codeforces Round #346 (Div. 2) (659A,659B,659C,659D(几何叉乘),659E(并查集))
BestCoder Round #77 (div.2)(hdu5650,hdu5651(逆元),hdu5652(二分),hdu5653(dp))