USACO

USACO: A Story About Farmer John and Bessie the Cow

Farmer John is the well acclaimed owner of many cows. But one of them always gets into mischief! Help Farmer John deal with Bessie the cow, using programs to assist them on their journey on the USACO site.

USACO By Year and Level

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Bronze Questions

Name	Year	Q#	Contest
Clockwise Fence	2021	Q3	February
Just Stalling	2021	Q3	January
Even More Odd Photos	2021	Q2	January

Silver Questions

Name	Year	Q#	Contest
Pogo-Cow	2013	Q3	November
Bessie’s Birthday Buffet	2015	Q3	US Open
Meeting Time	2015	Q3	January
Year of the Cow	2021	Q2	February
Meetings	2019	Q2	December
The Cow Run	2013	Q3	March
Spaced Out	2021	Q3	January
Cereal	2020	Q2	US Open
Social Distancing	2020	Q1	US Open
Dance Mooves	2021	Q1	January

Gold Questions

| Name | Year | Q# | Contest |
|——–|———|—-|———|
| Teamwork | 2018 | Q3 | December |
| Barn Painting | 2017 | Q3 | December |
| Taming the Herd | 2018 | Q3 | February |
| Why Did the Cow Cross the Road II | 2017 | Q2 | February |
| Talent Show | 2018 | Q3 | US Open |
| Telephone | 2021 | Q2 | January |
| Haybale Feast | 2017 | Q3 | December |
| Cow Checklist | 2016 | Q2 | December |
| Radio Contact | 2016 | Q2 | January |
| Closing the Farm | 2016 | Q2 | US Open |
| Sleepy Cow Herding | 2019 | Q2 | January |
| Hoof, Paper, Scissors | 2017 | Q2 | January |
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Video Solutions for USACO

Bronze Questions
Silver Questions
Gold DP Questions

Reference Implementation for USACO Questions

Gold

Silver

Contest	#	Name	Alogrithm	Language
2011 Nov	1	lineup	2Pointers	C++
2012 Nov	1	clumsy	Stack	C++
2012 Dec	1	wifi	DP	C++
2013 Feb	2	tractor	BinSearch	C++
	3	msched	Scheduling	C++
2013 Mar	2	tractor	DP	C++
	3	painting	SweepLine	C++
2013 Open	2	cruise	DFS	C++
2013 Nov	2	crowded	DP	C++
2014 Jan	2	ccski	BinSearch	C++
2014 Feb	2	auto	BinSearch	C++
2014 Dec	1	piggyback	BFS	Java
	2	marathon	DP	Java
	3	cowjog	Simulation	Java
2015 Dec	1	lightson	R FloodFill	C++
	2	highcard	2P	C++
	3	breedcounting	PrefixSum	C++
2016 Jan	1	angrycows	BinSearch	C++
	2	div7	Prefix	C++
	3	gates	Q FloodFill	C++
2016 Feb	1	cbarn	Simulation	C++
	2	balancing	Geometry	C++
	3	pails	Simulation	C++
2016 Open	1	reduce	Sorting,Geo	C++
	2	diamond	2Pointers	C++
	3	closing	BFS	C++
2016 Dec	1	haybales	BinSearch	C++
	2	citystate	Map	C++
	3	moocast	FloodFill	C++
2017 Jan	1	cowdance	BinSearch	C++
	2	hps	Prefix	C++
	3	cowcode	BinSearch	Java
2017 Feb	1	helpcross	2Pointers	C++
	2	maxcross	Prefix	C++
	3	countcross	FloodFill	C++
2017 Open	1	pairup	2Pointers	C++
	2	cownomics	SetHash	C++
	3	where	FloodFill	C++
2017 Dec	1	homework	Prefix	C++
	2	measurement	Simulation	C++
	3	shuffle	TopologySort_	C++
2018 Jan	1	lifeguards	Simulation	C++
	2	rental	Sorting	C++
	3	mootube	FloodFill	C++
2018 Feb	1	reststops	Math&Sim	C++
	2	snowboots	Recursion	C++
	3	teleport
2018 Open	1	sort	Sorting	C++
	2	lemonade	Math&Sim	C++
	3	multimoo	Graph&BFS	C++
2018 Dec	1	convention	BinSearch	C++
	2	convention2	Simulation	C++
	3	mooyomooyo	FloodFill	C++
2019 Jan	1	planting	Graph	C++
	2	perimeter	FloodFill	C++
	3	mountains	Sorting	C++
2019 Feb	1	herding	Sim/Prefix	C++
	2	paintbarn	2DPrefix	C++
	3	revegetate	BFS, BiPartite	C++
2019 Open	1	leftout		C++
	2	cowjump	SweepLine	C++
	3	fenceplan	DFS/FloodFill	C++
2019 Dec	1	moobuzz	Math	C++, Python
	2	meetings	Simulation	C++
	3	milkvisits	Graph DFS	C++
2020 Jan	1	berries	BinSearch/Brute	C++
	2	loan	BinSearch	C++
	3	wormsort	DFS/FloodFill	C++
2020 Feb	1	swap	CycleSim	C++
	2	triangles	Geometry	C++
	3	clocktree	BFS	C++
2020 Open	1	socdist	BinSearch	C++
	2	cereal	Simulation	C++
	3	moop	Prefix	C++

Bronze

| Contest | # | Name | Alogrithm | Level | Language |
| ——— | ————————————————————— | ————- | ————————————————————————————– | —— | ——– |
| 2015 Feb Bronze | 1 | censor | Brute Force | Easy | Python |
| | 2 | cow | DP | Easy | Python | | | | 3 | hopscotch | | Easy | Python | | | ——— | ————————————————————— | ————- | ————————————————————————————– | —— | ——– |
| 2017 Jan | 1 | notlast | Sort | Easy | Python |
| | 2 | hps | Simulation | Easy | Python | | | | 3 | cowtip | Brute Force | Easy | Python | | | ——— | ————————————————————— | ————- | ————————————————————————————– | —— | ——– |
| 2017 Open | 1 | lostcow | | Easy | Python |
| | 2 | cownomics | Sets | Easy | Python | | | | 3 | art | | Easy | Python | | | ——— | ————————————————————— | ————- | ————————————————————————————– | —— | ——– |
| 2017 Dec | 1 | billboard | Brute Force | Easy | Python |
| | 2 | shuffle | Simulation | Easy | Python | | | | 3 | measurement | Simulation | Easy | Python | | | ——— | ————————————————————— | ————- | ————————————————————————————– | —— | | 2018 Dec | 1 | mixmilk | Simulation | Easy | Python |
| | 2 | blist | | Easy | Python | | | | 3 | backforth | | Easy | Python | | | ——— | ————————————————————— | ————- | ————————————————————————————– | —— | ——– |
| 2018 Open | 1 | tttt | Brute Force | Easy | Python | | | 2 | milkorder | | Easy | | | | 3 | family | | Easy | | | ——— | ————————————————————— | ————- | ————————————————————————————– | —— | ——– |
| 2019 Jan | 1 | shellgame | Simulation | Easy | Python |
| | 2 | sleepy | AdHoc | Easy | C++ | | | | 3 | guess | | Easy | Python | | | ——— | ————————————————————— | ————- | ————————————————————————————– | —— | ——– |
| 2020 Jan | 1 | word | String | Easy | Python |
| | 2 | photo | Brute Force| Easy | Python | | | | 3 | race | | Easy | Python | | | 2020 Feb | 1 | triangles | | Easy | Python |
| | 2 | breedflip | Greedy | Easy | Python | | | | 3 | swap | | Easy | Python | | | ——— | ————————————————————— | ————- | ————————————————————————————– | —— | ——– |

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