To avoid common mistakes in competitive programming contests, a methodical approach is essential. Begin by thoroughly reading and understanding the problem statement, as misinterpretation is a frequent source of errors. When coding, avoid making assumptions about input formats or constraints that aren’t explicitly stated. Testing with edge cases, such as minimum, maximum, and unusual inputs, helps identify potential issues early. For example, if a problem involves sorting, think about cases where all elements are identical or where the list is already sorted. Developing a habit of breaking down problems and approaching them logically, rather than jumping to conclusions, enhances accuracy. Furthermore, practicing common algorithms that are known to be error-prone, such as dynamic programming or graph traversal, prepares you for contest situations. With practice, awareness, and a disciplined approach, avoiding mistakes becomes second nature in competitive programming.