---
id: ff
title: Flood Fill
author: Siyong Huang
prerequisites:
- Silver - Depth First Search
description: Finding connected components in a graph that is respresented by a grid.
## [Flood Fill](https://en.wikipedia.org/wiki/Flood_fill)
- [CSES Counting Rooms](https://cses.fi/problemset/task/1192)
- [CSES Labyrinth](https://cses.fi/problemset/task/1193)
### Tutorial
- Recommended:
- Intro to USACO Ch 10
### Problems
- [Ice Perimeter (Easy)](http://usaco.org/index.php?page=viewproblem2&cpid=895)
- [Switching on the Lights (Normal)](http://www.usaco.org/index.php?page=viewproblem2&cpid=570)
- [Build Gates (Normal)](http://www.usaco.org/index.php?page=viewproblem2&cpid=596)
- [Milk Pails (Normal)](http://usaco.org/index.php?page=viewproblem2&cpid=620)
- [Where's Bessie?](http://usaco.org/index.php?page=viewproblem2&cpid=740)
- [Why Did the Cow Cross the Road III, Silver (Normal)](http://usaco.org/index.php?page=viewproblem2&cpid=716)
- [Multiplayer Moo (Hard)](http://usaco.org/index.php?page=viewproblem2&cpid=836)
- [Snow Boots (Hard)](http://usaco.org/index.php?page=viewproblem2&cpid=811)
- [Mooyo Mooyo](http://usaco.org/index.php?page=viewproblem2&cpid=860)
