1059: 求阴影部分的面积
Memory Limit:128 MB
Time Limit:1.000 S
Judge Style:Text Compare
Creator:
Submit:109
Solved:52
Description
输入正方形的边长m和n(保证m<n),计算阴影部分(见图)的面积。
![](data:image/png;base64,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)
Input
一行两个浮点数m和n,中间用空格隔开。
Output
阴影部分的面积(保留一位小数)
Sample Input Copy
10.0 20.0
Sample Output Copy
150.0