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Need for Speed

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English

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Time limit
1000 ms
Memory limit
2048 MB (no extra memory)
Submissions
0
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0
Solved by
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AC rate
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Statement

Need for Speed, page 1

Examples

Sample input 1
3 5
4 -1
4 0
10 3
Sample output 1
3.000000000
Sample input 2
4 10
5 3
2 2
3 6
3 1
Sample output 2
-0.508653377

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