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How to ask for help on a problem
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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 19380 December 30, 2020
Welcome to the USACO Forum!
1 7661 November 19, 2020
Is an O(n²) prefix/suffix optimization possible for Codeforces 863B (Kayaking)?
Problems and Contests
0 14 July 22, 2026
Regarding the hard route problem, how can we prove that fixing the meeting point of vertex x with the route will not cause double counting?
Problems and Contests
0 22 July 21, 2026
# How did you actually get to IOI / national camps? Looking for guidance from people who've been there
General Questions
1 85 July 19, 2026
Help with recursion
General Questions
0 21 July 19, 2026
https://codeforces.com/problemset/problem/251/A
Problems and Contests
1 95 July 10, 2026
The hardest problem in Ha Noi City's first elimination round that no one has managed to solve onsite
Problems and Contests
2 1013 July 8, 2026
can I use a basic template and auto code completition
General Questions
5 220 June 27, 2026
probelms before 2015
General Questions
6 239 June 25, 2026
guidance for a newbie to cp
Resources & Problemsets
2 273 June 23, 2026
What should I do if I can't solve anything in module
General Questions
1 518 June 21, 2026
Stuck in a Rut – issue with mathematical (pairwise) approach
Debugging Help
2 638 June 21, 2026
Wrong constants in internal solution
Resources & Problemsets
1 182 June 18, 2026
Two knights problem
Problems and Contests
1 759 June 8, 2026
CSES: Corner Subgrid Check
Problems and Contests
1 256 June 7, 2026
Possibly wrong internal solution
Resources & Problemsets
1 238 June 5, 2026
Can someone explain this please?
Debugging Help
3 302 May 28, 2026
How to practice and solve problems more effectively
General Questions
0 324 May 18, 2026
Feeling stuck as a beginner
General Questions
1 440 May 11, 2026
Looking for people to join contest for acpc contest
Off Topic
0 261 May 6, 2026
Troubles with geometry problem "16"
Debugging Help
0 355 May 1, 2026
Can i use helper functions like printArr
General Questions
2 486 April 29, 2026
Silver 2020 Jan Loan Repayment with Binomial Theorem
Problems and Contests
4 2027 April 24, 2026
Is competitive math useful in USACO
General Questions
5 659 April 22, 2026
What's the main differences between TWO POINTERS and SLIDING WINDOW?
General Questions
1 623 April 18, 2026
How to solve APIO 2019 - street lamps using 2DRQ
Problems and Contests
1 1035 April 17, 2026
Is the usaco guide problems page broken ?
Site Feedback
1 469 April 2, 2026
About the listed question
Problems and Contests
2 437 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 )?
0 716 March 27, 2026