---
id: ds-gold
title: "Data Structures"
author: Michael Cao 
prerequisites: 
 - Silver - Data Structures
description: "Monotonic stack and sliding window."
---

# Springboards DS

  - [Karen & Cards](http://codeforces.com/contest/815/problem/D) [](86)
    - Extremely hard, do not attempt (2800 on CF)
(add more once codeforces comes up)