Update all new Tasks

Task/Stern-Brocot-sequence/D/stern-brocot-sequence-2.d

@@ -0,0 +1,18 @@
+import std.stdio, std.algorithm, std.range, std.numeric, queue_usage2;
+
+struct SternBrocot {
+    private auto sb = GrowableCircularQueue!uint(1, 1);
+    enum empty = false;
+    @property uint front() pure nothrow @safe @nogc {
+        return sb.front;
+    }
+    uint popFront() pure nothrow @safe {
+        sb.push(sb.front + sb[1]);
+        sb.push(sb[1]);
+        return sb.pop;
+    }
+}
+
+void main() {
+    SternBrocot().drop(50_000_000).front.writeln;
+}