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Very hard math/ad hoc problem AI can't solve
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2
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340
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September 6, 2026
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MaxMedian(CF) Why we don't count the number of equals to X?
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1
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100
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September 6, 2026
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Proving the solution for Atcoder arc 193 problem B
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2
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174
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August 25, 2026
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CSES Task 1628, Meet in the Middle
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2
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1743
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August 5, 2026
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Explaining a solution
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0
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223
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August 4, 2026
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Alternative O(N) solution for Social Distancing I passes 14/15 — looking for a counterexample or flaw in the approach
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2
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311
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July 30, 2026
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Not able to understand editorial of Counting liars
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0
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201
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July 26, 2026
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Is an O(n²) prefix/suffix optimization possible for Codeforces 863B (Kayaking)?
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0
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245
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July 22, 2026
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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?
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0
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198
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July 21, 2026
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https://codeforces.com/problemset/problem/251/A
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1
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300
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July 10, 2026
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The hardest problem in Ha Noi City's first elimination round that no one has managed to solve onsite
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2
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1204
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July 8, 2026
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Two knights problem
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1
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889
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June 8, 2026
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CSES: Corner Subgrid Check
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1
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482
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June 7, 2026
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Silver 2020 Jan Loan Repayment with Binomial Theorem
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4
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2152
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April 24, 2026
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How to solve APIO 2019 - street lamps using 2DRQ
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1
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1172
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April 17, 2026
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About the listed question
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2
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550
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March 31, 2026
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Issue with USACO guide's solution for lasers and mirrors
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2
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636
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March 17, 2026
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Need help understand the full solution for problem #3 Purchasing Milk
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3
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759
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March 5, 2026
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CSES: All Letter Subgrid Count I
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9
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1946
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March 3, 2026
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DNC DP + Mo's at the same time? [Advanced]
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2
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927
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March 3, 2026
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Explanation for subtask #2 in Bronze P3 (2nd contest, 2026)
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3
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933
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February 22, 2026
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Confusion in Completeness of Solution for Platinum 2017 P1: Why Did the Cow Cross the Road (Mincross)
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2
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828
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February 17, 2026
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IOI 2013 Dreaming Solution
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4
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874
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February 15, 2026
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Issue in 2017 Gold Problem 3 Modern Art 2 Problem Statement / Official Solution
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4
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775
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February 12, 2026
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Can anyone help me with this problem? I have been trying since yesterday
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0
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601
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February 8, 2026
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(resolved )2025 silver open problem 3 ski slope fails for all but test case
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2
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1309
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February 8, 2026
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What counts as a template in VS code?
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1
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633
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February 7, 2026
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USACO 2022 Dec Silver 2. Circular Barn: May you help me understand this test case?
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2
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779
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January 28, 2026
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Distinct Values Subarrays
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2
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1308
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January 22, 2026
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Assisting with 868A-Bark To Unlock
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1
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834
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January 21, 2026
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