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Problem A
Hornrétt
Languages
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Image from Flickr
Input
The input contains three integers $a$, $b$, and $c$, the side lengths of the triangle.
Output
Print the area of the triangle if it’s possible to make a right angled triangle with side lengths $a$, $b$ and $c$, otherwise print $-1$.
Scoring
Group |
Points |
Constraints |
1 |
50 |
$1 \leq a \leq b \leq c \leq 10^4$ |
2 |
50 |
$1 \leq a \leq b \leq c \leq 10^9$ |
Sample Input 1 | Sample Output 1 |
---|---|
3 4 5 |
6 |
Sample Input 2 | Sample Output 2 |
---|---|
4 6 7 |
-1 |