Friends and Subsequences
题目描述
Mike and !Mike are old childhood rivals, they are opposite in everything they do, except programming. Today they have a problem they cannot solve on their own, but together (with you)− who knows?
Every one of them has an integer sequences a and b of length n. Being given a query of the form of pair of integers (l,r), Mike can instantly tell the value of 
while !Mike can instantly tell the value of 
.
Now suppose a robot (you!) asks them all possible different queries of pairs of integers (l,r) (1≤l≤r≤n) (so he will make exactly n(n+1)/2 queries) and counts how many times their answers coincide, thus for how many pairs 
is satisfied.
How many occasions will the robot count?
The first line contains only integer n (1≤n≤200000).
The second line contains n integer numbers a1,a2,...,an (-109≤ai≤109)− the sequence a.
The third line contains n integer numbers b1,b2,...,bn (-109≤bi≤109)− the sequence b.
Print the only integer number− the number of occasions the robot will count, thus for how many pairs is satisfied.
6
1 2 3 2 1 4
6 7 1 2 3 2
2
3
3 3 3
1 1 1
0
The occasions in the first sample case are:
1.l=4,r=4 since max{2}=min{2}.
2.l=4,r=5 since max{2,1}=min{2,3}.
There are no occasions in the second sample case since Mike will answer 3 to any query pair, but !Mike will always answer 1.
题目来源：fps-www.educg.net-codeforce-1-2833.xml.zip；FPS 共享题包，题包内第 661 题。保留原作者与原赛事署名。