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Task/Balanced-brackets/Phix/balanced-brackets.phix

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+function check_brackets(sequence s)
+integer level = 0
+    for i=1 to length(s) do
+        switch s[i]
+            case '[': level += 1
+            case ']': level -= 1
+                      if level<0 then exit end if
+        end switch
+    end for
+    return (level=0)
+end function
+
+sequence s
+constant ok = {"not ok","ok"}
+
+for i=1 to 10 do
+    for j=1 to 2 do
+        s = shuffle(join(repeat("[]",i-1),""))
+        printf(1,"%s %s\n",{s,ok[check_brackets(s)+1]})
+    end for
+end for