in1

5 2
5
7
0
18
16
20
19

out1

-1

https://www.luogu.com.cn/blog/SSL-XXY/solution-p2214 输出707406379

https://www.luogu.com.cn/blog/luqyou/solution-p2214 输出1

https://www.luogu.com.cn/blog/98954/solution-p2214 输出1061109568

https://www.luogu.com.cn/blog/yueyang/solution-p2214 输出2139062144

https://www.luogu.com.cn/blog/solitudeabandentsky/solution-p2214 输出1061109568

https://www.luogu.com.cn/blog/aeber/solution-p2214 输出2139062144

in2

5 2
5
7
0 
17 
100000
1 
20

out2

-1

https://www.luogu.com.cn/blog/winmt/solution-p2214 RE

https://www.luogu.com.cn/blog/159686/solution-p2214 RE

https://www.luogu.com.cn/blog/hyt555/solution-p2214 输出14291

https://www.luogu.com.cn/blog/Delonxdl-legend/solution-p2214 RE

in3

5 2
5
7
0
2
3
4
5

out3

-1

https://www.luogu.com.cn/blog/cyc1065768794/solution-p2214 输出 -4

此外，https://www.luogu.com.cn/blog/tby-blog/solution-p2214 过不去样例，爆破。https://www.luogu.com.cn/blog/li-mi/solution-p2214 毫无讲解，爆破。

综上所述，此题的题解已经被我叉光！