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HashMaps\r\n\r\nProblems based on the HashMap data structure\r\n\r\n## SDE Sheet problems on HashMaps\r\n\r\n[Sheet Link](https://takeuforward.org/interviews/strivers-sde-sheet-top-coding-interview-problems/)\r\n\r\n### Day 4 (Hashing)\r\n\r\n| Completion Status | Problems on HashMaps | Explanation | Solution |\r\n| --- | --- | --- | --- |\r\n| ✅ | [Two Sum](https://leetcode.com/problems/two-sum/) | [Brute, Better \u0026 Optimal Approaches](#) | [Java Soultion](./src/sde_sheet/TwoSum.java) |\r\n| ✅ | [4Sum](https://leetcode.com/problems/4sum/) | [Brute, Better \u0026 Optimal Approaches](#) | [Java Soultion](./src/sde_sheet/FourSum.java) |\r\n| ✅ | [Longest Consecutive Sequence](https://leetcode.com/problems/longest-consecutive-sequence/) | [Brute, Better \u0026 Optimal Approaches](#) | [Java Soultion](./src/sde_sheet/LongestConsecutiveSequence.java) |\r\n| ✅ | [Largest subarray with 0 sum](https://practice.geeksforgeeks.org/problems/largest-subarray-with-0-sum/1#) | [Brute, Better \u0026 Optimal Approaches](#) | [Java Soultion](./src/sde_sheet/Largest_0_Sum_Subarray.java) |\r\n| ✅ | [Count the number of subarrays having a given XOR](https://www.geeksforgeeks.org/count-number-subarrays-given-xor/) | [Brute, Better \u0026 Optimal Approaches](#) | [Java Soultion](./src/sde_sheet/CountXORsubarrays.java) |\r\n| 🔃 | [Longest Substring Without Repeating Characters](https://leetcode.com/problems/longest-substring-without-repeating-characters/) | [Brute, Better \u0026 Optimal Approaches](#) | [Java Soultion](./src/sde_sheet/LongestSubstring.java) |\r\n\r\n---\r\n\r\n\u003c!-- \r\n\r\nStatus Table for SDE Sheet problems\r\n\r\n### Day x\r\n\r\n| Completion Status | Problems on Arrays | Explanation | Solution |\r\n| --- | --- | --- | --- |\r\n| ✅ | []() | [Brute, Better \u0026 Optimal Approaches](#) | [Java Soultion](./src/sde_sheet/.java) |\r\n| 🔃 | []() | [Brute, Better \u0026 Optimal Approaches](#) | [Java Soultion](./src/sde_sheet/.java) |\r\n\r\n 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