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Convex hull

Time Limit: 5000/3000 MS (Java/Others)    Memory Limit: 131072/131072 K (Java/Others)
Total Submission(s): 760    Accepted Submission(s): 180
Special Judge

Problem Description
 

Sample Input
3 1
0 0 0 0
0 1 0 0
1 0 1 0
 

Sample Output
0.750000
 

Hint


 

Source
2013 Multi-University Training Contest 10
 

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