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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 20653 December 30, 2020
Welcome to the USACO Forum!
1 8085 November 19, 2020
Proving the solution for Atcoder arc 193 problem B
Problems and Contests
3 282 October 1, 2026
Guidance for a newbie to cp
Resources & Problemsets
2 595 June 23, 2026
Proving Solution Complexity
Problems and Contests
0 63 September 26, 2026
Very hard math/ad hoc problem AI can't solve
Problems and Contests
2 490 September 6, 2026
MaxMedian(CF) Why we don't count the number of equals to X?
Problems and Contests
1 184 September 6, 2026
how to use the usaco guide ?
General Questions
1 222 September 4, 2026
Scared for USACO and General C++ Problems
General Questions
1 858 September 2, 2026
C++20 support on USACO
General Questions
3 235 August 29, 2026
CSES Task 1628, Meet in the Middle
Problems and Contests
2 1797 August 5, 2026
Explaining a solution
Problems and Contests
0 291 August 4, 2026
Alternative O(N) solution for Social Distancing I passes 14/15 — looking for a counterexample or flaw in the approach
Problems and Contests
2 427 July 30, 2026
Feature Request: Add a "Revision" Module Status
Site Feedback
2 331 July 30, 2026
Not able to understand editorial of Counting liars
Problems and Contests
0 267 July 26, 2026
USACO Dark Mode
Resources & Problemsets
0 300 July 24, 2026
Is an O(n²) prefix/suffix optimization possible for Codeforces 863B (Kayaking)?
Problems and Contests
0 305 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
0 265 July 21, 2026
# How did you actually get to IOI / national camps? Looking for guidance from people who've been there
General Questions
1 517 July 19, 2026
Help with recursion
General Questions
0 283 July 19, 2026
https://codeforces.com/problemset/problem/251/A
Problems and Contests
1 358 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 1250 July 8, 2026
can I use a basic template and auto code completition
General Questions
5 505 June 27, 2026
probelms before 2015
General Questions
6 526 June 25, 2026
What should I do if I can't solve anything in module
General Questions
1 756 June 21, 2026
Stuck in a Rut – issue with mathematical (pairwise) approach
Debugging Help
2 985 June 21, 2026
Wrong constants in internal solution
Resources & Problemsets
1 461 June 18, 2026
Two knights problem
Problems and Contests
1 945 June 8, 2026
CSES: Corner Subgrid Check
Problems and Contests
1 561 June 7, 2026
Possibly wrong internal solution
Resources & Problemsets
1 500 June 5, 2026