Initial data commit

Task/Factorial/Nim/factorial-1.nim

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+import math
+let i:int = fac(x)

Task/Factorial/Nim/factorial-2.nim

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+proc factorial(x): int =
+  if x > 0: x * factorial(x - 1)
+  else: 1

Task/Factorial/Nim/factorial-3.nim

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+proc factorial(x: int): int =
+  result = 1
+  for i in 2..x:
+    result *= i