IRCTC Recursive Train Seat Counter
IRCTC Recursive Train Seat Counter
EasyRecursion100% accepted
IRCTC booking confirmations work on factorial seat arrangements. Given n, compute n! recursively. For large n return result modulo 10^9+7.
Approach
Compute n factorial recursively with modular arithmetic.
Input
10
5 0 7 10 5 6 8 10 6 8
Output
65
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