2019牛客暑假多校训练（第九场）

补题ing.... 从简单补起...

补题顺序：D - E - B（3/10）

D - Knapsack Cryptosystem

原题链接：D.Knapsack Cryptosystem

题解链接：https://www.cnblogs.com/Tianwell/p/11372748.html

E - All men are brothers

原题链接：E - All men are brothers

题解链接：https://www.cnblogs.com/Tianwell/p/11372758.html

B - Quadratic equation 2019牛客多校（二次剩余)