C++-判断-输入三角形的三边长a,b,c，判断是否能构成三角形，并求面积（使用逻辑运算符 && 、||、 ！)
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Background
Description
输入三角形的三边长a,b,c，判断是否能构成三角形，并求面积（使用逻辑运算符 && 、||、 ！)
Format
Input
Output
Samples
1
2
3
No
5
7
8
Yes
17.3205
1
2
2
Yes
0.968246
Limitation
1s, 1024KiB for each test case.
