2311. Longest Binary Subsequence Less Than or Equal to K - LeetCode POTD - 26 July 2025

📄All the notes & code are uploaded : https://leetcode.com/problems/longest-binary-subsequence-less-than-or-equal-to-k/solutions/6889027/detailed-observation-analysis-how-to-app-shr9
❓Question Link : https://leetcode.com/problems/longest-binary-subsequence-less-than-or-equal-to-k/description/

🧠 Question Description
Given a binary string s and an integer k, the task is to return the length of the longest subsequence of s that can be interpreted as a binary number less than or equal to k. The subsequence must maintain the relative order of characters but can skip elements. This problem requires understanding how binary numbers grow in value and how to greedily form valid numbers from the end to stay within bounds. The edge case of overflow is handled by restricting bit length to 31, making the solution both efficient and elegant. The challenge lies in optimally choosing characters to stay within k and maximizing subsequence length. This is a common problem in greedy + bit manipulation category that often appears in interviews and contests.
🏷️Tags / Concepts Covered
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📌 Timestamps :
00:00 General Discussion
00:53 Question Explanation
03:16 Observation - 01 [ Prefix sum of Zero ]
05:45 Observation - 02 [ Traversing from where ? ]
11:18 Dry Run
19:14 How to set any bit ?
23:32 Code Explained
28:04 Full Code Overview
28:16 End Discussion

💬 🔔 Updates / Notices
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Видео 2311. Longest Binary Subsequence Less Than or Equal to K - LeetCode POTD - 26 July 2025 канала Intuit & Code