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.
\n
Example 1:
\n\n\nInput: n = 1\nOutput: 1.00000\nExplanation: The first person can only get the first seat.\n\n
Example 2:
\n\n\nInput: n = 2\nOutput: 0.50000\nExplanation: The second person has a probability of 0.5 to get the second seat (when first person gets the first seat).\n\n\n
\n
Constraints:
\n\n1 <= n <= 105Compiled with clang 11 using the latest C++ 17 standard.
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