Initial data commit

Task/Balanced-brackets/D/balanced-brackets-2.d

@@ -0,0 +1,23 @@
+import std.stdio, std.random, std.range, std.algorithm;
+
+bool isBalanced(in string txt) pure nothrow {
+    auto count = 0;
+
+    foreach (immutable c; txt) {
+        if (c == ']') {
+            count--;
+            if (count < 0)
+                return false;
+        } else if (c == '[')
+            count++;
+    }
+
+    return count == 0;
+}
+
+void main() {
+    foreach (immutable i; 1 .. 9) {
+        immutable s = iota(i * 2).map!(_ => "[]"[uniform(0, 2)]).array;
+        writeln(s.isBalanced ? " OK " : "Bad ", s);
+    }
+}