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 4. [Summary Ranges](https://leetcode.com/problems/summary-ranges/description/) `Leetcode 150`
 5. [Minimum Number of Arrows to Burst Balloons](https://leetcode.com/problems/minimum-number-of-arrows-to-burst-balloons/description/) `Leetcode 150`
 6. [Meeting rooms II](https://www.interviewbit.com/problems/meeting-rooms/) `Blind 75`
+
+### Topic: Stack and Queue
+1. [Implement Stack using Queues](https://leetcode.com/problems/implement-stack-using-queues/description/) `Striver`
+2. [Implement Queue using Stacks](https://leetcode.com/problems/implement-queue-using-stacks/description/) `Striver`
+3. [Valid Parentheses](https://leetcode.com/problems/valid-parentheses/description/) `Leetcode 150` `Striver`
+4. [Min Stack](https://leetcode.com/problems/min-stack/description/) `Leetcode 150` `Striver`
+5. [LRU Cache](https://leetcode.com/problems/lru-cache/description/) `Leetcode 150` `Striver`
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