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1. Codeforces Codeforces Public

   Codeforces is a competitive programming platform offering regular contests and a large collection of algorithmic problems to improve problem-solving skills.

   C++

2. CP-31 CP-31 Public

   CP-31 is a platform that provides competitive-programming problems rated 800–1900, organized into sections of 31 problems each.

   C++

3. CSES CSES Public

   CSES is a collection of algorithmic programming problems, organized by topics for learning and practice.

   C++

4. Advent_Of_Code Advent_Of_Code Public

   Advent of Code is a yearly set of daily programming puzzles released each December, designed to test problem-solving and algorithmic skills.

   C++

5. Leetcode Leetcode Public

   C++

6. Algorithms Algorithms Public

   C++