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Task/Constrained-random-points-on-a-circle/Nim/constrained-random-points-on-a-circle.nim

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+import tables, math, strutils, complex
+randomize()
+
+proc random[T](a: openarray[T]): T =
+  result = a[random(low(a)..len(a))]
+
+type Point = tuple[x, y: int]
+
+var world = initCountTable[Point]()
+
+var possiblePoints = newSeq[Point]()
+for x in -15..15:
+  for y in -15..15:
+    if abs((x.float, y.float)) in 10.0..15.0:
+      possiblePoints.add((x,y))
+
+for i in 0..100: world.inc possiblePoints.random
+
+for x in -15..15:
+  for y in -15..15:
+    if world[(x,y)] > 0:
+      stdout.write min(9, world[(x,y)])
+    else:
+      stdout.write ' '
+  echo ""