Hacktoberfest 2026: the issues maintainers tagged for October, open and beginner-friendly. Browse Hacktoberfest issues

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  • Problem on article Minimum Stack / Minimum Queue
    Open
    • Is something wrong?

    Difficulty 2/5 1-3 hours Newbie friendliness 72/100

    cp-algorithms/cp-algorithms#1715 ·

    Maintainers usually reply within 1 day

  • Add Kahn's algorithm
    Open
    • Is something wrong?

    Difficulty 2/5 1-3 hours Newbie friendliness 72/100

    cp-algorithms/cp-algorithms#1710 · 1 comment ·

    Maintainers usually reply within 1 day

  • inconsistency in math
    Open
    • Is something wrong?

    Difficulty 1/5 1-3 hours Newbie friendliness 72/100

    cp-algorithms/cp-algorithms#1657 · 1 comment ·

    Maintainers usually reply within 1 day

  • Dry run example for DInic's algorithm
    Open
    • Is something wrong?

    Difficulty 2/5 1-3 hours Newbie friendliness 68/100

    cp-algorithms/cp-algorithms#1637 ·

    Maintainers usually reply within 1 day

  • Add Hopcroft-Karp Algorithm
    Open
    • Is something wrong?
    new-article-suggestion

    Difficulty 4/5 3-5 days Newbie friendliness 35/100

    cp-algorithms/cp-algorithms#1606 ·

    Maintainers usually reply within 1 day

  • Easier solution for schedule-with-completion-duration.md
    May be free again Open
    • Is something wrong?
    enhancement

    cp-algorithms/cp-algorithms#1593 · 3 comments · 1 assignee ·

    Maintainers usually reply within 1 day

  • Create article: Parity of a Permutation
    Open
    • Is something wrong?

    Difficulty 3/5 1-2 days Newbie friendliness 45/100

    cp-algorithms/cp-algorithms#1585 · 2 comments ·

    Maintainers usually reply within 1 day

  • Article Request: Tree Rerooting Technique
    Open
    • Is something wrong?
    new-article-suggestion

    Difficulty 5/5 Over a week Newbie friendliness 30/100

    cp-algorithms/cp-algorithms#1556 ·

    Maintainers usually reply within 1 day

  • Farey Sequence next term algorithm
    Open
    • Is something wrong?
    enhancement

    Difficulty 2/5 1-3 hours Newbie friendliness 65/100

    cp-algorithms/cp-algorithms#1552 ·

    Maintainers usually reply within 1 day

  • Feature Request: Add a section on Dynamic Dynamic Programming (DDP)
    Open
    • Is something wrong?

    Difficulty 5/5 Over a week Newbie friendliness 35/100

    cp-algorithms/cp-algorithms#1494 · 5 comments ·

    Maintainers usually reply within 1 day

  • Need reliable commitment for maintainers.
    Open
    • Is something wrong?
    help wanted

    Difficulty 5/5 Over a week Newbie friendliness 20/100

    cp-algorithms/cp-algorithms#1489 · 13 comments ·

    Maintainers usually reply within 1 day

  • Problem on article Maximum flow - Push-relabel algorithm
    Open
    • Is something wrong?
    bug help wanted

    Difficulty 2/5 1-3 hours Newbie friendliness 45/100

    cp-algorithms/cp-algorithms#1470 · 4 comments · 2 reactions ·

    Maintainers usually reply within 1 day

  • feat (enhancement) : on event cmd + k -> focus on search bar
    Open
    • Is something wrong?

    Difficulty 3/5 1-2 days Newbie friendliness 25/100

    cp-algorithms/cp-algorithms#1467 · 4 comments ·

    Maintainers usually reply within 1 day

  • Square root trick for modular exponentiation
    Open
    • Is something wrong?

    Difficulty 3/5 1-2 days Newbie friendliness 35/100

    cp-algorithms/cp-algorithms#1465 · 3 comments ·

    Maintainers usually reply within 1 day

  • Minimum queue removal logic is wrong
    Open
    • Is something wrong?

    Difficulty 2/5 1-3 hours Newbie friendliness 38/100

    cp-algorithms/cp-algorithms#1462 · 3 comments ·

    Maintainers usually reply within 1 day

  • We're losing to usaco.guide (traffic + maintenance)
    Open
    • Is something wrong?
    enhancement help wanted

    Difficulty 5/5 Over a week Newbie friendliness 20/100

    cp-algorithms/cp-algorithms#1452 · 36 comments ·

    Maintainers usually reply within 1 day

  • Error in "Compressing a string" section in "Prefix function. Knuth–Morris–Pratt algorithm"
    Open
    • Is something wrong?

    Difficulty 1/5 Under an hour Newbie friendliness 35/100

    cp-algorithms/cp-algorithms#1414 · 5 comments ·

    Maintainers usually reply within 1 day

  • Fenwick Tree: Rewrite to focus on 1-based indexing
    Open
    • Is something wrong?
    enhancement

    Difficulty 4/5 3-5 days Newbie friendliness 35/100

    cp-algorithms/cp-algorithms#1346 · 5 comments ·

    Maintainers usually reply within 1 day

  • Interval tree
    May be free again Open
    • Is something wrong?
    new-article-suggestion

    cp-algorithms/cp-algorithms#1337 · 2 comments · 1 assignee ·

    Maintainers usually reply within 1 day

  • Half-plane intersection
    Open
    • Is something wrong?
    bug

    Difficulty 3/5 1-2 days Newbie friendliness 35/100

    cp-algorithms/cp-algorithms#1332 · 2 comments ·

    Maintainers usually reply within 1 day

  • enhance section about memory efficient segment trees?
    Open
    • Is something wrong?
    enhancement

    Difficulty 3/5 1-2 days Newbie friendliness 45/100

    cp-algorithms/cp-algorithms#1312 · 4 comments ·

    Maintainers usually reply within 1 day

  • Problem on article Linear Sieve
    Open
    • Is something wrong?
    enhancement

    Difficulty 2/5 1-3 hours Newbie friendliness 50/100

    cp-algorithms/cp-algorithms#1260 · 1 comment ·

    Maintainers usually reply within 1 day

  • Need to make editing and adding articles easier
    Open
    • Is something wrong?
    enhancement

    Difficulty 5/5 Over a week Newbie friendliness 25/100

    cp-algorithms/cp-algorithms#1212 · 27 comments · 1 reaction ·

    Maintainers usually reply within 1 day

  • Article for surreal numbers and combinatorial games
    Open
    • Is something wrong?
    new-article-suggestion

    Difficulty 5/5 Over a week Newbie friendliness 25/100

    cp-algorithms/cp-algorithms#1191 · 2 comments ·

    Maintainers usually reply within 1 day

  • Sort Practice Problems in order of difficulty and add some easy medium and hard tags
    Open
    • Is something wrong?
    enhancement

    Difficulty 4/5 3-5 days Newbie friendliness 25/100

    cp-algorithms/cp-algorithms#1190 · 4 comments ·

    Maintainers usually reply within 1 day

  • Article for probability basics and expected value
    Open
    • Is something wrong?
    new-article-suggestion

    Difficulty 4/5 3-5 days Newbie friendliness 35/100

    cp-algorithms/cp-algorithms#1169 · 1 comment ·

    Maintainers usually reply within 1 day

  • Can we have one article about this method?
    Open
    • Is something wrong?
    new-article-suggestion

    Difficulty 3/5 1-2 days Newbie friendliness 35/100

    cp-algorithms/cp-algorithms#1138 · 7 comments ·

    Maintainers usually reply within 1 day

  • Improve Time Complexity for MCF and Assignment Problem
    Open
    • Is something wrong?
    enhancement

    Difficulty 4/5 3-5 days Newbie friendliness 35/100

    cp-algorithms/cp-algorithms#1087 · 1 comment ·

    Maintainers usually reply within 1 day

  • Time complexity for fraction-search-algorithm
    Open
    • Is something wrong?
    enhancement

    Difficulty 2/5 1-3 hours Newbie friendliness 35/100

    cp-algorithms/cp-algorithms#1066 · 5 comments ·

    Maintainers usually reply within 1 day

  • Suffix Array Linear Time Construction
    Open
    • Is something wrong?
    enhancement

    Difficulty 5/5 Over a week Newbie friendliness 35/100

    cp-algorithms/cp-algorithms#1050 · 1 comment ·

    Maintainers usually reply within 1 day

  • Information gap in suffix array article
    Open
    • Is something wrong?
    enhancement

    Difficulty 3/5 1-2 days Newbie friendliness 35/100

    cp-algorithms/cp-algorithms#1048 · 2 comments ·

    Maintainers usually reply within 1 day

  • Article for Count Sort
    Open
    • Is something wrong?
    new-article-suggestion

    Difficulty 2/5 1-3 hours Newbie friendliness 38/100

    cp-algorithms/cp-algorithms#1041 · 11 comments ·

    Maintainers usually reply within 1 day

  • Rename Algebra section to Number Theory
    Open
    • Is something wrong?
    enhancement

    Difficulty 2/5 1-3 hours Newbie friendliness 50/100

    cp-algorithms/cp-algorithms#1011 · 4 comments ·

    Maintainers usually reply within 1 day

  • Article on Pell's Equation
    Open
    • Is something wrong?
    new-article-suggestion

    Difficulty 5/5 Over a week Newbie friendliness 25/100

    cp-algorithms/cp-algorithms#1005 · 7 comments ·

    Maintainers usually reply within 1 day

  • Linear Sieve enhancements
    Open
    • Is something wrong?
    enhancement

    Difficulty 4/5 3-5 days Newbie friendliness 25/100

    cp-algorithms/cp-algorithms#1004 · 2 comments ·

    Maintainers usually reply within 1 day

  • Sieve of Eratosthenes variant to factor numbers
    Open
    • Is something wrong?

    Difficulty 4/5 3-5 days Newbie friendliness 25/100

    cp-algorithms/cp-algorithms#1001 · 6 comments ·

    Maintainers usually reply within 1 day

  • Problem on article "Fibonacci Numbers"
    Open
    • Is something wrong?
    enhancement

    Difficulty 1/5 1-3 hours Newbie friendliness 38/100

    cp-algorithms/cp-algorithms#976 · 5 comments ·

    Maintainers usually reply within 1 day

  • "Circle-Circle Intersection" in vector notation
    Open
    • Is something wrong?
    enhancement

    Difficulty 3/5 1-2 days Newbie friendliness 35/100

    cp-algorithms/cp-algorithms#968 · 7 comments ·

    Maintainers usually reply within 1 day

  • Circle-Line Intersection in vector notation
    Open
    • Is something wrong?
    enhancement

    Difficulty 4/5 3-5 days Newbie friendliness 30/100

    cp-algorithms/cp-algorithms#967 · 2 comments ·

    Maintainers usually reply within 1 day

  • Variable Mixed Up in Quadratic irrationality Explanation
    May be free again Open
    • Is something wrong?
    bug

    cp-algorithms/cp-algorithms#964 · 1 assignee ·

    Maintainers usually reply within 1 day

  • Question about article "Prefix function - Knuth-Morris-Pratt"
    May be free again Open
    • Is something wrong?
    bug

    cp-algorithms/cp-algorithms#963 · 1 comment · 1 assignee ·

    Maintainers usually reply within 1 day

  • Article on common I/O optimizations
    Open
    • Is something wrong?
    new-article-suggestion

    Difficulty 3/5 1-2 days Newbie friendliness 42/100

    cp-algorithms/cp-algorithms#903 · 12 comments · 1 reaction ·

    Maintainers usually reply within 1 day

  • Problem on article "Minimum-cost flow"
    Open
    • Is something wrong?
    new-article-suggestion

    Difficulty 4/5 3-5 days Newbie friendliness 30/100

    cp-algorithms/cp-algorithms#892 · 1 comment ·

    Maintainers usually reply within 1 day

  • Sqrt Decomposition notation
    Open
    • Is something wrong?
    enhancement

    Difficulty 2/5 1-3 hours Newbie friendliness 68/100

    cp-algorithms/cp-algorithms#879 · 4 comments ·

    Maintainers usually reply within 1 day

  • Article on subset sum?
    Open
    • Is something wrong?
    new-article-suggestion

    Difficulty 3/5 1-2 days Newbie friendliness 35/100

    cp-algorithms/cp-algorithms#836 · 7 comments ·

    Maintainers usually reply within 1 day

  • Make editor and preview side by side
    Open
    • Is something wrong?
    enhancement

    Difficulty 4/5 3-5 days Newbie friendliness 35/100

    cp-algorithms/cp-algorithms#780 · 2 comments ·

    Maintainers usually reply within 1 day

  • Improving article on polynomial operations
    May be free again Open
    • Is something wrong?
    enhancement

    cp-algorithms/cp-algorithms#771 · 4 comments · 1 assignee ·

    Maintainers usually reply within 1 day

  • Updating "Finding common tangents to two circles" to also show point calculation
    Open
    • Is something wrong?
    enhancement

    Difficulty 3/5 1-2 days Newbie friendliness 42/100

    cp-algorithms/cp-algorithms#682 · 8 comments ·

    Maintainers usually reply within 1 day

  • Sieve with Linear Time Complexity can be implemented by using a boolean array instead of an int array
    Open
    • Is something wrong?
    enhancement

    Difficulty 3/5 1-2 days Newbie friendliness 38/100

    cp-algorithms/cp-algorithms#583 · 2 comments ·

    Maintainers usually reply within 1 day

  • Dedicated article about multiplicative functions
    Open
    • Is something wrong?
    new-article-suggestion

    Difficulty 5/5 Over a week Newbie friendliness 25/100

    cp-algorithms/cp-algorithms#529 · 4 comments · 1 reaction ·

    Maintainers usually reply within 1 day

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