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Problem 3620. -- (c4必做)求三角形面积

(c4必做)求三角形面积

Time Limit: 1 Sec  Memory Limit: 128 MB
Submit: 3170  Solved: 1386
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Description

输入三角形三边长,输出三角形的面积(保留两位小数)

Input

Output

Sample Input

3 4 5

Sample Output

6.00

HINT

Source

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