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Fibonacci
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| def fibonacci(num: Int): BigInt = | |
| @scala.annotation.tailrec | |
| def fibFcn(n: Int, acc1: BigInt, acc2: BigInt): BigInt = n match | |
| case 0 => acc1 | |
| case 1 => acc2 | |
| case _ => fibFcn(n - 1, acc2, acc1 + acc2) | |
| fibFcn(num, 0, 1) | |
| fibonacci(90) |
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