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A1094 | [COCI-2006_2007-olympiad]#1 PATRIK

来源COCI
时间限制1s
内存限制128MB
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题目描述

N people are waiting in line to enter a concert. People get bored waiting so they turn and look for someone familiar in the line.
Two persons A and B standing in line can see each other if they're standing right next to each other or if no person between them is strictly taller than person A or person B.
Write a program that determines the number of pairs of people that can see each other.

输入格式

The first line of input contains an integer N (1 ≤ N ≤ 500 000), the number of people standing in line.
Each of the following N lines contains a single integer, the height of one person in nanometres.
Everyone will be shorter than 231 nanometres.
The heights are given in the order in which people are standing in line.

输出格式

Output the number of pairs of people that can see each other on a single line.

输入输出样例

输入 #1
7 
2 
4 
1 
2 
2 
5 
1
输出 #1
10
C++ 编辑器
输入
输出