How to write questions on LeetCode?

Writing effective questions on LeetCode is a specialized skill that requires a precise blend of technical clarity, problem-solving intent, and community awareness. The primary goal is not to seek open-ended discussion but to obtain a specific, actionable insight that unblocks your progress on a coding challenge. Therefore, the most successful questions are narrowly scoped, demonstrate substantial prior effort, and are framed to elicit explanations of underlying concepts or debugging logic rather than outright solutions. A poorly formed question, such as a vague "Why doesn't my code work?" with a pasted block of code, is often ignored or downvoted. In contrast, a well-structured inquiry that clearly states the problem number, explains your algorithmic approach, includes your code with proper formatting, specifies the exact input causing failure, and articulates your hypothesis about the issue is far more likely to attract detailed, helpful responses from experienced community members.

The mechanism for crafting such a question involves a deliberate pre-writing process. Before posting, you must isolate the core confusion, which often lies in a misunderstanding of a data structure's behavior, an edge case in the problem constraints, or a subtle bug in loop invariants or recursion termination. Your question should explicitly reference these elements. For instance, instead of merely posting code for a binary tree problem, you should state, "I am using a recursive DFS approach to find the maximum path sum. My logic works for the example case [provide example], but fails on the test case [provide specific input]. I believe my issue is in how I am returning values from the recursive helper function when node values are negative; here is my current return statement and my reasoning." This demonstrates debugging rigor and directs helpers to the precise conceptual knot to untangle.

Practically, this translates to a standard but critical format: a concise title indicating the problem and core issue (e.g., "LeetCode 15: 3Sum - Time Limit Exceeded with O(n^2) Approach"), followed by a body with distinct sections. These should include a brief problem restatement in your own words, a description of your algorithm's intended logic and complexity, the specific failing test case or error message, your code (formatted with proper indentation), and the most crucial part—your own analysis of why you think the failure occurs. This final component separates a genuine learning attempt from a solution grab. The community values evidence of struggle and conceptual engagement, and showing your work up to the point of confusion invites collaborative correction rather than passive answer-giving.

The implications of mastering this skill extend beyond receiving an answer. The discipline of formulating a question in this manner is itself a powerful debugging and learning exercise, often leading you to self-solve the problem. Furthermore, it builds credibility within the LeetCode community, increasing the likelihood of future engagement on your posts. It also aligns with the professional practice of articulating technical issues to colleagues or during system design interviews, where clarity and precision are paramount. Ultimately, the quality of your question directly governs the quality and utility of the response, turning the forum from a solution repository into a genuine platform for collaborative technical growth.