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usaco-guide/content/4_Silver/Maps_Sets.mdx
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---
id: maps-sets
title: "More with Maps & Sets"
author: Benjamin Qi
prerequisites:
- Bronze - Data Structures
description: "More with iterators?"
---
(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)