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 | Time Based Key Value Store |  [LeetCode](https://leetcode.com/problems/time-based-key-value-store/)  | [Youtube](https://www.youtube.com/watch?v=fu2cD_6E8Hw)<br> [Medium](https://sakshi8699.medium.com/981-time-based-key-value-store-python-65bd81742818)| [Java](./codes/java/timebasedkeyvaluestore.java)<br> [Python](./codes/python/timebasedkeyvaluestore.py) |
 | Longest Common Substring | [GFG](https://www.geeksforgeeks.org/longest-common-substring-dp-29/)  | [Youtube](https://www.youtube.com/watch?v=_wP9mWNPL5w&t=689s) | [Java](./codes/java/LongestCommonSubstring.java)
 | House Robber II |  [LeetCode](https://leetcode.com/problems/house-robber-ii/)  | [Youtube](https://www.youtube.com/watch?v=3WaxQMELSkw) | [Java](./codes/java/HouseRobberII.java) |
+| Design Hashmap |  [LeetCode](https://leetcode.com/problems/design-hashmap/)  | [Youtube](https://youtu.be/Xt4TuW31rtc?si=lEAxCq8KEhg45AA1) | [C++](./codes/cpp/Design-Hashmap.cpp) |
 | Minimum Swaps To Make Sequences Increasing |  [LeetCode](https://leetcode.com/problems/minimum-swaps-to-make-sequences-increasing/)  | [Youtube](https://www.youtube.com/watch?v=IeT9Qz_vqHo) | [Java](./codes/java/minimumswapstomakesequencesincreasing.java)<br> [C++](./codes/cpp/minimumswapstomakesequencesincreasing.cpp) |
 | Find Kth Bit in Nth Binary String |  [LeetCode](https://leetcode.com/problems/find-kth-bit-in-nth-binary-string/) | [Youtube](https://www.youtube.com/watch?v=34QYE5HAFy4) | [Java](./codes/java/KthBitNthBinaryString.java)
 | Set Matrix Zeros | [LeetCode](https://leetcode.com/problems/set-matrix-zeroes/) | [Youtube](https://www.youtube.com/watch?v=M65xBewcqcI) | [Java](./codes/java/setmatrixzeros.java) |