Difference Max

题目描述

Given are integers $a$, $b$, $c$, and $d$.
We will choose integers $x$ and $y$ such that $a ≤ x ≤ b$ and $c ≤ y ≤ d$. Find the maximum possible value of $x - y$ here.

输入格式

Input is given from Standard Input in the following format: $a$ $b$ $c$ $d$

输出格式

Print the answer.

0 10
0 10

10

-100 -100
100 100

-200

-100 100
-100 100

200

提示

All values in input are integers. $-100 ≤ a ≤ b ≤ 100$ $-100 ≤ c ≤ d ≤ 100$$(x, y) = (10, 0)$ achieves the maximum value $x - y = 10$.

标签: AtCoder|abc196A

来源

AtCoder|abc196A