problems (Link -> Solution)

Arrays and Hashing

• Two Sum -> Java

• valid anagram -> ValidAnagram.java

• top k frequent elements -> TopKelements.java

Stack

• valid parentheses -> ValidParentheses.java

Two Pointer

• valid palindrome -> ValidPalindrome.java

Sliding Window

• best-time-to-buy-and-sell-stock -> BuySellStock.java
• count-vowel-substrings-of-a-string -> CountVowelSubString.java

Binary Search

• find-minimum-in-rotated-sorted-array -> MinElementInRotatedSortedArray.java
• 295. Find Median from Data Stream -> Python

Linked List

• merge-two-sorted-lists -> MergeLinkedList.java
• 2058. Find the Minimum and Maximum Number of Nodes Between Critical Points -> Python Java
• 2181. Merge Nodes in Between Zeros -> Python

Trees

• lowest-common-ancestor-of-a-binary-search-tree -> LowestCommonAncestor.java
• validate-binary-search-tree -> ValidBST.java
• kth-smallest-element-in-a-bst -> KthSmallestBst.java
• construct-binary-tree-from-preorder-and-inorder-traversal -> Java
• Binary Tree Maximum Path Sum -> Java
• 297. Serialize and Deserialize Binary Tree ->Python

Tree with BFS

• binary-tree-level-order-traversal -> LevelOrder.java

BackTracking/ Recursion

• 39. Combination Sum -> Python
• 79. Word Search -> Python

Misc

• valid-word -> Java

Daily Challenge

• three-consecutive-odds -> ThreeConsecutiveOdds.java
• intersection of two arrays II -> Intersect.java, intersect.py
• 1509. Minimum Difference Between Largest and Smallest Value in Three Moves ->MinDist3Moves.java, min_diff_3_move.py
• 2582. Pass the Pillow -> Python, Java
• 1518. Water Bottles -> Python, Java