2019 Multi-University,Nowcoder Day 9

Problem A

Solved by Weaver_zhu. 04:10:16 (+)

Problem B

Solved by Xiejiadong. 00:47:16 (+)

题意：给出 $a+b\;mod\; p$ 和 $ab\;mod\; p$ 的结果，求 $a$ 和 $b$ 。

题解：可以从 $(a-b)^2=(a+b)^2-4ab$ 得到 $(a-b)^2$ ，利用二次剩余求得 $a-b$ ，再和差得到 $a$ 、 $b$ 。

F0RE1GNERS 的二次剩余板子需要特判 $b=0$ 的情况，会死循环。

Problem C

Solved by Kilo_5723. 04:46:30 (+1)

Problem D

Solved by Kilo_5723. 00:52:54 (+)

Problem E

Solved by Xiejiadong. 01:49:18 (+)

Problem F

Unsolved.

Problem G

Unsolved.

Problem H

Upsolved by Xiejiadong. (-11)

Problem I

Unsolved.

Problem J

Solved by Kilo_5723. 01:24:15 (+3)