Initial data commit

Task/Sudan-function/Nim/sudan-function.nim

@@ -0,0 +1,16 @@
+import std/[unicode, strformat]
+
+func sudan(n, x, y: Natural): int =
+  if n == 0: return x + y
+  if y == 0: return x
+  let z = sudan(n, x, y - 1)
+  return sudan(n - 1, z, z + y)
+
+const Delta = ord("₀".toRunes()[0]) - ord('0')
+
+func subscript(n: Natural): string =
+  for c in $n:
+    result.add Rune(ord(c) + Delta)
+
+for (n, x, y) in [(0, 0, 0), (1, 1, 1), (2, 1, 1), (2, 2, 1), (2, 2, 2), (3, 1, 1)]:
+  echo &"F{subscript(n)}({x}, {y}) = {sudan(n, x, y)}"