---
id: maps-sets
title: "More with Maps & Sets"
author: Benjamin Qi
prerequisites: 
 - Bronze - Data Structures
description: "More with iterators?"
frequency: 2
---

(set iterators?)

## USACO Problems

 - [CSES Bit Inversions](https://cses.fi/problemset/task/1188/)
 - Silver
   - [Cities & States](http://usaco.org/index.php?page=viewproblem2&cpid=667)
   - [Milk Measurement](http://usaco.org/index.php?page=viewproblem2&cpid=763)
   - [Convention II](http://usaco.org/index.php?page=viewproblem2&cpid=859)
 - Gold
   - [Snow Boots](http://www.usaco.org/index.php?page=viewproblem2&cpid=813)
   - [Springboards](http://www.usaco.org/index.php?page=viewproblem2&cpid=995)
    - hard?

## CF Problems

  - [Jury Marks](http://codeforces.com/contest/831/problem/C) [](67)
    - Hard, would recommend skipping (1700 on CF)
  - [Mahmoud & Ehab & Function](http://codeforces.com/contest/862/problem/E) [](74)
    - Hard, do not attempt until Gold/Plat (2100 on CF)
  - [Tournament](http://codeforces.com/contest/878/problem/C) [](106)
    - First solve problem for $n$-th tournament only
    - Extremely hard, do not attempt (2700 on CF)