Convex hull

Time Limit: 3000ms
Memory Limit: 131072KB
This problem will be judged on HDU. Original ID: 4697
64-bit integer IO format: %I64d      Java class name: Main
Special Judge

Description

Sample Input

3 1
0 0 0 0
0 1 0 0
1 0 1 0

Sample Output

0.750000

Source

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