第 045 场 AtCoder Beginner Contest
梯形AI (CI翻译)
Problem Statement
题目描述
AI (CI翻译)You are given a trapezoid. The lengths of its upper base, lower base, and height are $a$, $b$, and $h$, respectively.
给定一个梯形。其上底、下底和高的长度分别为 $a$、$b$ 和 $h$。AI (CI翻译)
An example of a trapezoid
梯形示例AI (CI翻译)
Find the area of this trapezoid.
请你求出这个梯形的面积。AI (CI翻译)
Constraints
约束条件
AI (CI翻译)$1≦a≦100$$1≦b≦100$$1≦h≦100$- All input values are integers.
$h$is even.
$1≦a≦100$$1≦b≦100$$1≦h≦100$- 所有输入值均为整数。
$h$是偶数。
Input
输入格式
AI (CI翻译)The input is given from Standard Input in the following format:
输入从标准输入按以下格式给出：AI (CI翻译)
a
b
ha
b
hOutput
输出格式
AI (CI翻译)Print the area of the given trapezoid. It is guaranteed that the area is an integer.
输出给定梯形的面积。可以保证面积为整数。AI (CI翻译)
样例
Input #1
3
4
2
Output #1
7
When the lengths of the upper base, lower base, and height are $3$, $4$, and $2$, respectively, the area of the trapezoid is $(3+4)×2/2 = 7$.
Input #2
4
4
4
Output #2
16
In this case, a parallelogram is given, which is also a trapezoid.
题目信息
题面与样例版权归 AtCoder 及出题人所有；中文翻译由 AI 生成（gpt-6.1-sol），如有出入请以原文为准。