1182 . Statisticians

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User's AC Ratio

NaN% (0/0)

Submission's AC Ratio

NaN% (0/0)

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Description

Please download the problemset(pdf) here.

Input Format

Output Format

Sample Input 1

2
2 3
2 4
6 1 4
2 7 1
4 2
1 8
6 5
2 5
2 9
7 13

Sample Output 1

3.667
5.250

Hints

Info: 本題輸出為浮點數，絕對或相對誤差 1e-3 以下視為正確

Problem Source

Migrated from old NTUJ.

Subtasks

No. Testdata Range Score

Testdata and Limits

No. Time Limit (ms) Memory Limit (VSS, KiB) Output Limit (KiB) Subtasks
0 10000 65536 200
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