Data update

Task/Balanced-brackets/Ballerina/balanced-brackets.ballerina

@@ -0,0 +1,34 @@
+import ballerina/io;
+import ballerina/random;
+
+function isBalanced(string s) returns boolean {
+    if s == "" { return true; }
+    int countLeft = 0; // number of left brackets so far unmatched
+    foreach var c in s {
+        if c == "[" {
+            countLeft += 1;
+        } else if countLeft > 0 {
+            countLeft -= 1;
+        } else {
+            return false;
+        }
+    }
+    return countLeft == 0;
+}
+
+public function main() {
+    io:println("Checking examples in task description:");
+    var brackets = ["", "[]", "][", "[][]", "][][", "[[][]]", "[]][[]"];
+    foreach string b in brackets {
+        io:print((b != "") ? b : "(empty)");
+        io:println("\t  ", isBalanced(b) ? "OK" : "NOT OK");
+    }
+    io:println("\nChecking 7 random strings of brackets of length 8:");
+    foreach int i in 1...7 {
+        string s = "";
+        foreach int j in 1...8 {
+            s += random:createIntInRange(0, 2) == 0  ? "[" : "]";
+        }
+        io:println(s, "  ",  isBalanced(s) ? "OK" : "NOT OK");
+    }
+}

Task/Balanced-brackets/Excel/balanced-brackets-3.excel

@@ -0,0 +1 @@
+=REDUCE(A2, SEQUENCE(MAX(1, LEN(A2))), LAMBDA(a, _, SUBSTITUTE(a, "[]", ))) = ""

Task/Balanced-brackets/Excel/balanced-brackets-4.excel

@@ -0,0 +1 @@
+=REDUCE(REGEXREPLACE(A2, "[^\[\]]", ), SEQUENCE(MAX(1, LEN(A2))), LAMBDA(a, _, SUBSTITUTE(a, "[]", ))) = ""