AtCoder Beginner Contest 070
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Problem Statement
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Alice and Bob are controlling a robot. They each have one switch that controls the robot.
Alice started holding down her button $A$ second after the start-up of the robot, and released her button $B$ second after the start-up.
Bob started holding down his button $C$ second after the start-up, and released his button $D$ second after the start-up.
For how many seconds both Alice and Bob were holding down their buttons?
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Constraints
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$0≤A<B≤100$$0≤C<D≤100$- All input values are integers.
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Input
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Input is given from Standard Input in the following format:
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A B C D翻译中…
Output
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Print the length of the duration (in seconds) in which both Alice and Bob were holding down their buttons.
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样例
Input #1
0 75 25 100
Output #1
50
Alice started holding down her button $0$ second after the start-up of the robot, and released her button $75$ second after the start-up.
Bob started holding down his button $25$ second after the start-up, and released his button $100$ second after the start-up.
Therefore, the time when both of them were holding down their buttons, is the $50$ seconds from $25$ seconds after the start-up to $75$ seconds after the start-up.
Input #2
0 33 66 99
Output #2
0
Alice and Bob were not holding their buttons at the same time, so the answer is zero seconds.
Input #3
10 90 20 80
Output #3
60
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（CI 管线），如有出入请以原文为准。