C++-初识C++-求正方形的面积
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Background
Description
有一个正方形，四个角的坐标（x,y)分别是(1，-1)，(1，1)，(-1，-1)，(-1，1)，x是横轴，y是纵轴。写一个程序，计算其周长和面积。
Format
Input
Output
Samples
8
4
Limitation
1s, 1024KiB for each test case.
