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How to ask for help on a problem
Announcements

Here are some general guidelines for how to effectively ask for help on the Forum: Basic Requirements Include a link to the problem. For problems that that can be found within the guide, just include the internal Gui…

1 17405 December 30, 2020
Welcome to the USACO Forum!
1 7167 November 19, 2020
Is competitive math useful in USACO
General Questions
1 17 April 21, 2026
What's the main differences between TWO POINTERS and SLIDING WINDOW?
General Questions
1 58 April 18, 2026
How to solve APIO 2019 - street lamps using 2DRQ
Problems and Contests
1 743 April 17, 2026
Can i use helper functions like printArr
General Questions
1 84 April 13, 2026
Is the usaco guide problems page broken ?
Site Feedback
1 128 April 2, 2026
About the listed question
Problems and Contests
2 137 March 31, 2026
Does the problem "Team Building" (USACO 2016 December Platinum Problem 2) not reduce to finding all valid parenthetical expressions of length 2K given a string of ( and )?
0 154 March 27, 2026
Stuck in a Rut – issue with mathematical (pairwise) approach
Debugging Help
0 185 March 25, 2026
What should I do if I can't solve anything in module
General Questions
0 165 March 19, 2026
Issue with USACO guide's solution for lasers and mirrors
Problems and Contests
2 154 March 17, 2026
About Resources in Usaco Guide
General Questions
1 175 March 11, 2026
Result of USACO contest not showing
General Questions
2 254 March 9, 2026
Need help understand the full solution for problem #3 Purchasing Milk
Problems and Contests
3 225 March 5, 2026
CSES: All Letter Subgrid Count I
Problems and Contests
9 469 March 3, 2026
DNC DP + Mo's at the same time? [Advanced]
Problems and Contests
2 298 March 3, 2026
Angry Cows - Gold January 2016 Problem 1
5 1110 February 23, 2026
Explanation for subtask #2 in Bronze P3 (2nd contest, 2026)
Problems and Contests
3 349 February 22, 2026
Looking for Codeforces and USACO study mate
General Questions
6 577 February 22, 2026
How can i reach GRAND MASTER on Codeforce
Resources & Problemsets
1 335 February 22, 2026
Division update in USACO Jan contest
General Questions
2 353 February 19, 2026
Prefix Sum Section
General Questions
2 332 February 18, 2026
Confusion in Completeness of Solution for Platinum 2017 P1: Why Did the Cow Cross the Road (Mincross)
Problems and Contests
2 397 February 17, 2026
IOI 2013 Dreaming Solution
Problems and Contests
4 310 February 15, 2026
Cpi tournament registration error
General Questions
2 240 February 14, 2026
Usaco score unable to show
5 363 February 13, 2026
Issue in 2017 Gold Problem 3 Modern Art 2 Problem Statement / Official Solution
Problems and Contests
4 322 February 12, 2026
does leaving EGOI eligible: blank cause some problem?
General Questions
1 283 February 11, 2026
How can I learn everything in two weeks before the next competition?
General Questions
1 296 February 10, 2026