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Airplane Seat Assignment Probability
n passengers board an airplane with exactly n seats.
n passengers board an airplane with exactly n seats. The first passenger has lost the ticket and picks a seat randomly. But after that, the rest of the passengers will:
Return the probability that the nth person gets his own seat.
Example 1
Input: n = 1
Output: 1.00000
Explanation: The first person can only get the first seat.
Example 2
Input: n = 2
Output: 0.50000
Explanation: The second person has a probability of 0.5 to get the second seat (when first person gets the first seat).
Constraints
- 1 <= n <= 10^5
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