Create 0225-implement-stack-using-queues.kt

Author: a93a

kotlin/0225-implement-stack-using-queues.kt

@@ -0,0 +1,28 @@
+class MyStack() {
+
+    val stack = LinkedList<Int>()
+
+    fun push(x: Int) = stack.addLast(x)
+
+    // Circular behaviour
+    fun pop(): Int {
+        repeat(stack.size-1) {
+            stack.addLast(stack.removeFirst())
+        }
+        return stack.removeFirst()
+    }
+
+    fun top() = stack.peekLast()
+
+    fun empty() = stack.isEmpty()
+
+}
+
+/**
+ * Your MyStack object will be instantiated and called as such:
+ * var obj = MyStack()
+ * obj.push(x)
+ * var param_2 = obj.pop()
+ * var param_3 = obj.top()
+ * var param_4 = obj.empty()
+ */