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Task/Balanced-brackets/Ring/balanced-brackets.ring

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+nr = 0
+while nr < 10
+      nr += 1
+      test=generate(random(9)+1)
+      see "bracket string " + test + " is " + valid(test) + nl
+end
+
+func generate n
+l = 0 r = 0 output = ""
+while l<n and r<n
+      switch random(2)
+      on 1 l+=1 output+="["
+      on 2 r+=1 output+="]"
+      off
+end
+if l=n output+=copy("]",n-r) else output+=copy("]",n-l) ok
+return output
+
+func valid q
+count = 0
+if len(q)=0 return "ok." ok
+for x=1 to len(q)
+    if substr(q,x,1)="[" count+=1 else count-=1 ok
+    if count<0 return "not ok." ok
+next
+return "ok."