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Waterworld

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English

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Time limit
3000 ms
Memory limit
2048 MB (no extra memory)
Submissions
0
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Statement

Waterworld, page 1

Waterworld, page 2

Examples

Sample input 1
3 7
63 61 55 54 77 87 89
73 60 38 5 16 56 91
75 43 11 3 16 20 95
Sample output 1
51.809523810
Sample input 2
4 3
10 10 10
10 10 10
10 10 10
10 10 10
Sample output 2
10.000000000

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