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TopCoder

User's AC Ratio

NaN% (0/0)

Submission's AC Ratio

NaN% (0/0)

Tags

NTU Preliminary NTU Preliminary 2012

Description

The PDF version of the problemset can be downloaded here.

Input Format

Output Format

Sample Input 1

1
1 2 1 1
1

Sample Output 1

0.750000000

Hints

Info: 本題輸出為浮點數，絕對或相對誤差 1e-6 以下視為正確

Problem Source

Migrated from old NTUJ.

tmt+ferng+dreamoon

Subtasks

No.	Testdata Range	Score

Testdata and Limits

No.	Time Limit (ms)	Memory Limit (VSS, KiB)	Output Limit (KiB)	Subtasks
0	2000	65536	200

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