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Problem 1360. -- [Baltic2009]Subway

1360: [Baltic2009]Subway

Time Limit: 5 Sec  Memory Limit: 64 MB
Submit: 228  Solved: 2
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Description

 JudgeOnline/upload/201803/subway.pdf

Input

Output

Sample Input

100 5
55 L
37 L
47 L
89 L
41 R

Sample Output

19.000000

HINT

Source

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