A-M baby

Task/Balanced-brackets/Fantom/balanced-brackets.fantom

@@ -0,0 +1,39 @@
+class Main
+{
+  static Bool matchingBrackets (Str[] brackets)
+  {
+    Int opened := 0
+    Int i := 0
+    while (i < brackets.size)
+    {
+      if (brackets[i] == "[")
+        opened += 1
+      else
+        opened -= 1
+      if (opened < 0) return false
+      i += 1
+    }
+    return true
+  }
+
+  public static Void main (Str[] args)
+  {
+    if (args.size == 1 && Int.fromStr(args[0], 10, false) != null)
+    {
+      n := Int.fromStr(args[0])
+      Str[] brackets := [,]
+      20.times
+      {
+        brackets = [,]
+        // create a random set of brackets
+        n.times { brackets.addAll (["[", "]"]) }
+        n.times { brackets.swap(Int.random(0..<2*n), Int.random(0..<2*n)) }
+        // report if matching or not
+        if (matchingBrackets(brackets))
+          echo (brackets.join(" ") + " Matching")
+        else
+          echo (brackets.join(" ") + " not matching")
+      }
+    }
+  }
+}