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Task/Number-reversal-game/Nim/number-reversal-game.nim

@@ -0,0 +1,41 @@
+import math, rdstdin, strutils, algorithm
+randomize()
+
+proc shuffle[T](x: var seq[T]) =
+  for i in countdown(x.high, 0):
+    let j = random(i + 1)
+    swap(x[i], x[j])
+
+proc isSorted[T](s: openarray[T]): bool =
+  var last = low(T)
+  for c in s:
+    if c < last:
+      return false
+    last = c
+  return true
+
+proc toString[T](s: openarray[T]): string =
+  result = ""
+  for i, x in s:
+    if i > 0:
+      result.add " "
+    result.add($x)
+
+echo """number reversal game
+    Given a jumbled list of the numbers 1 to 9
+    Show the list.
+    Ask the player how many digits from the left to reverse.
+    Reverse those digits then ask again.
+    until all the digits end up in ascending order."""
+
+var data = @[1,2,3,4,5,6,7,8,9]
+var trials = 0
+while isSorted data:
+  shuffle data
+while not isSorted data:
+  inc trials
+  var flip = parseInt readLineFromStdin(
+    "#" & $trials & ": List: '" & toString(data) & "' Flip how many?: ")
+  reverse(data, 0, flip - 1)
+
+echo "You took ", trials, " attempts to put the digits in order!"