Day 19: Longest Consecutive Sequence (LeetCode 128) — HashSet | O(n) скачать в хорошем качестве

Day 19: Longest Consecutive Sequence (LeetCode 128) — HashSet | O(n)

🎯 Day 19 of My LeetCode Journey | Longest Consecutive Sequence (LeetCode 128) In this video, I solve LeetCode Problem #128 — Longest Consecutive Sequence using a HashSet to achieve an optimized O(n) solution. The goal is to find the length of the longest sequence of consecutive numbers in an unsorted array. 🔗 Problem Link: https://leetcode.com/problems/longest... 📌 PROBLEM SUMMARY: Given an array of integers nums, return the length of the longest consecutive elements sequence. You must write an algorithm that runs in O(n) time. ✅ Example 1: Input: nums = [100, 4, 200, 1, 3, 2] Output: 4 Explanation: The longest consecutive sequence is [1, 2, 3, 4]. ✅ Example 2: Input: nums = [0,3,7,2,5,8,4,6,0,1] Output: 9 💡 KEY CONCEPTS: ✅ HashSet for fast lookup ✅ Consecutive sequence detection ✅ Avoiding repeated scans ✅ Optimal O(n) strategy 📊 COMPLEXITY: • Time: O(n) • Space: O(n) 🎓 DIFFICULTY: Medium 🏷️ TOPICS: Hash Table, Array, Set, Greedy 🔔 SUBSCRIBE for daily LeetCode solutions and coding challenges! 👍 LIKE if you found this helpful! 💬 COMMENT your thoughts or variations! 📚 MY LEETCODE JOURNEY PLAYLIST:    • Leetcode   🤝 CONNECT WITH ME: • GitHub: https://github.com/ashwinikemshetty • LinkedIn:   / ashwinikemshetty   #LeetCode #LongestConsecutiveSequence #LeetCode128 #Day19 #HashSet #Array #DSA #Algorithms #100DaysOfCode