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130 changes: 64 additions & 66 deletions leetcode-categorized/README.md
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# Leetcode-Questions
Leetcode question list by companies, include the premium questions.

Last updated- 2nd December 2019
Leetcode question list by companies includes the premium questions.

Last updated - 2nd December 2019

# Curated List of Top 75 LeetCode Questions


## Array

- [ ] [Two Sum](https://leetcode.com/problems/two-sum/)
Expand Down Expand Up @@ -34,99 +32,99 @@ Last updated- 2nd December 2019

## Dynamic Programming

- [ ] [Climbing Stairs](https://leetcode.com/problems/climbingstairs/)
- [ ] [Coin Change](https://leetcode.com/problems/coinchange/)
- [ ] [Longest Increasing Subsequence](https://leetcode.com/problems/longestincreasingsubsequence/)
- [ ] [Longest Common Subsequence]()
- [ ] [Word Break Problem](https://leetcode.com/problems/wordbreak/)
- [ ] [Combination Sum](https://leetcode.com/problems/combinationsumiv/)
- [ ] [House Robber](https://leetcode.com/problems/houserobber/)
- [ ] [House Robber II](https://leetcode.com/problems/houserobberii/)
- [ ] [Decode Ways](https://leetcode.com/problems/decodeways/)
- [ ] [Unique Paths](https://leetcode.com/problems/uniquepaths/)
- [ ] [Jump Game](https://leetcode.com/problems/jumpgame/)
- [ ] [Climbing Stairs](https://leetcode.com/problems/climbing-stairs/)
- [ ] [Coin Change](https://leetcode.com/problems/coin-change/)
- [ ] [Longest Increasing Subsequence](https://leetcode.com/problems/longest-increasing-subsequence/)
- [ ] [Longest Common Subsequence](https://leetcode.com/problems/longest-common-subsequence/)
- [ ] [Word Break Problem](https://leetcode.com/problems/word-break/)
- [ ] [Combination Sum](https://leetcode.com/problems/combination-sum-iv/)
- [ ] [House Robber](https://leetcode.com/problems/house-robber/)
- [ ] [House Robber II](https://leetcode.com/problems/house-robber-ii/)
- [ ] [Decode Ways](https://leetcode.com/problems/decode-ways/)
- [ ] [Unique Paths](https://leetcode.com/problems/unique-paths/)
- [ ] [Jump Game](https://leetcode.com/problems/jump-game/)

---

## Graph

- [ ] [Clone Graph](https://leetcode.com/problems/clonegraph/)
- [ ] [Course Schedule](https://leetcode.com/problems/courseschedule/)
- [ ] [Pacific Atlantic Water Flow](https://leetcode.com/problems/pacificatlanticwaterflow/)
- [ ] [Number of Islands](https://leetcode.com/problems/numberofislands/)
- [ ] [Longest Consecutive Sequence](https://leetcode.com/problems/longestconsecutivesequence/)
- [ ] [Alien Dictionary (Leetcode Premium)](https://leetcode.com/problems/aliendictionary/)
- [ ] [Graph Valid Tree (Leetcode Premium)](https://leetcode.com/problems/graphvalidtree/)
- [ ] [Number of Connected Components in an Undirected Graph (Leetcode Premium)](https://leetcode.com/problems/numberofconnectedcomponentsinanundirectedgraph/)
- [ ] [Clone Graph](https://leetcode.com/problems/clone-graph/)
- [ ] [Course Schedule](https://leetcode.com/problems/course-schedule/)
- [ ] [Pacific Atlantic Water Flow](https://leetcode.com/problems/pacific-atlantic-water-flow/)
- [ ] [Number of Islands](https://leetcode.com/problems/number-of-islands/)
- [ ] [Longest Consecutive Sequence](https://leetcode.com/problems/longest-consecutive-sequence/)
- [ ] [Alien Dictionary (Leetcode Premium)](https://leetcode.com/problems/alien-dictionary/)
- [ ] [Graph Valid Tree (Leetcode Premium)](https://leetcode.com/problems/graph-valid-tree/)
- [ ] [Number of Connected Components in an Undirected Graph (Leetcode Premium)](https://leetcode.com/problems/number-of-connected-components-in-an-undirected-graph/)

---

## Interval

- [ ] [Insert Interval](https://leetcode.com/problems/insertinterval/)
- [ ] [Merge Intervals](https://leetcode.com/problems/mergeintervals/)
- [ ] [Non-overlapping Intervals](https://leetcode.com/problems/nonoverlappingintervals/)
- [ ] [Meeting Rooms (Leetcode Premium)](https://leetcode.com/problems/meetingrooms/)
- [ ] [Meeting Rooms II (Leetcode Premium)](https://leetcode.com/problems/meetingroomsii/)
- [ ] [Insert Interval](https://leetcode.com/problems/insert-interval/)
- [ ] [Merge Intervals](https://leetcode.com/problems/merge-intervals/)
- [ ] [Non-overlapping Intervals](https://leetcode.com/problems/non-overlapping-intervals/)
- [ ] [Meeting Rooms (Leetcode Premium)](https://leetcode.com/problems/meeting-rooms/)
- [ ] [Meeting Rooms II (Leetcode Premium)](https://leetcode.com/problems/meeting-rooms-ii/)

---

## Linked List

- [ ] [Reverse a Linked List](https://leetcode.com/problems/reverselinkedlist/)
- [ ] [Detect Cycle in a Linked List](https://leetcode.com/problems/linkedlistcycle/)
- [ ] [Merge Two Sorted Lists](https://leetcode.com/problems/mergetwosortedlists/)
- [ ] [Merge K Sorted Lists](https://leetcode.com/problems/mergeksortedlists/)
- [ ] [Remove Nth Node From End Of List](https://leetcode.com/problems/removenthnodefromendoflist/)
- [ ] [Reorder List](https://leetcode.com/problems/reorderlist/)
- [ ] [Reverse a Linked List](https://leetcode.com/problems/reverse-linked-list/)
- [ ] [Detect Cycle in a Linked List](https://leetcode.com/problems/linked-list-cycle/)
- [ ] [Merge Two Sorted Lists](https://leetcode.com/problems/merge-two-sorted-lists/)
- [ ] [Merge K Sorted Lists](https://leetcode.com/problems/merge-k-sorted-lists/)
- [ ] [Remove Nth Node From End Of List](https://leetcode.com/problems/remove-nth-node-from-end-of-list/)
- [ ] [Reorder List](https://leetcode.com/problems/reorder-list/)

---

## Matrix

- [ ] [Set Matrix Zeroes](https://leetcode.com/problems/setmatrixzeroes/)
- [ ] [Spiral Matrix](https://leetcode.com/problems/spiralmatrix/)
- [ ] [Rotate Image](https://leetcode.com/problems/rotateimage/)
- [ ] [Word Search](https://leetcode.com/problems/wordsearch/)
- [ ] [Set Matrix Zeroes](https://leetcode.com/problems/set-matrix-zeroes/)
- [ ] [Spiral Matrix](https://leetcode.com/problems/spiral-matrix/)
- [ ] [Rotate Image](https://leetcode.com/problems/rotate-image/)
- [ ] [Word Search](https://leetcode.com/problems/word-search/)

---

## String

- [ ] [Longest Substring Without Repeating Characters](https://leetcode.com/problems/longestsubstringwithoutrepeatingcharacters/)
- [ ] [Longest Repeating Character Replacement](https://leetcode.com/problems/longestrepeatingcharacterreplacement/)
- [ ] [Minimum Window Substring](https://leetcode.com/problems/minimumwindowsubstring/)
- [ ] [Valid Anagram](https://leetcode.com/problems/validanagram/)
- [ ] [Group Anagrams](https://leetcode.com/problems/groupanagrams/)
- [ ] [Valid Parentheses](https://leetcode.com/problems/validparentheses/)
- [ ] [Valid Palindrome](https://leetcode.com/problems/validpalindrome/)
- [ ] [Longest Palindromic Substring](https://leetcode.com/problems/longestpalindromicsubstring/)
- [ ] [Palindromic Substrings](https://leetcode.com/problems/palindromicsubstrings/)
- [ ] [Encode and Decode Strings (Leetcode Premium)](https://leetcode.com/problems/encodeanddecodestrings/)
- [ ] [Longest Substring Without Repeating Characters](https://leetcode.com/problems/longest-substring-without-repeating-characters/)
- [ ] [Longest Repeating Character Replacement](https://leetcode.com/problems/longest-repeating-character-replacement/)
- [ ] [Minimum Window Substring](https://leetcode.com/problems/minimum-window-substring/)
- [ ] [Valid Anagram](https://leetcode.com/problems/valid-anagram/)
- [ ] [Group Anagrams](https://leetcode.com/problems/group-anagrams/)
- [ ] [Valid Parentheses](https://leetcode.com/problems/valid-parentheses/)
- [ ] [Valid Palindrome](https://leetcode.com/problems/valid-palindrome/)
- [ ] [Longest Palindromic Substring](https://leetcode.com/problems/longest-palindromic-substring/)
- [ ] [Palindromic Substrings](https://leetcode.com/problems/palindromic-substrings/)
- [ ] [Encode and Decode Strings (Leetcode Premium)](https://leetcode.com/problems/encode-and-decode-strings/)

---

## Tree

- [ ] [Maximum Depth of Binary Tree](https://leetcode.com/problems/maximumdepthofbinarytree/)
- [ ] [Same Tree](https://leetcode.com/problems/sametree/)
- [ ] [Invert/Flip Binary Tree](https://leetcode.com/problems/invertbinarytree/)
- [ ] [Binary Tree Maximum Path Sum](https://leetcode.com/problems/binarytreemaximumpathsum/)
- [ ] [Binary Tree Level Order Traversal](https://leetcode.com/problems/binarytreelevelordertraversal/)
- [ ] [Serialize and Deserialize Binary Tree](https://leetcode.com/problems/serializeanddeserializebinarytree/)
- [ ] [Subtree of Another Tree](https://leetcode.com/problems/subtreeofanothertree/)
- [ ] [Construct Binary Tree from Preorder and Inorder Traversal](https://leetcode.com/problems/constructbinarytreefrompreorderandinordertraversal/)
- [ ] [Validate Binary Search Tree](https://leetcode.com/problems/validatebinarysearchtree/)
- [ ] [Kth Smallest Element in a BST](https://leetcode.com/problems/kthsmallestelementinabst/)
- [ ] [Lowest Common Ancestor of BST](https://leetcode.com/problems/lowestcommonancestorofabinarysearchtree/)
- [ ] [Implement Trie (Prefix Tree)](https://leetcode.com/problems/implementtrieprefixtree/)
- [ ] [Add and Search Word](https://leetcode.com/problems/addandsearchworddatastructuredesign/)
- [ ] [Word Search II](https://leetcode.com/problems/wordsearchii/)
- [ ] [Maximum Depth of Binary Tree](https://leetcode.com/problems/maximum-depth-of-binary-tree/)
- [ ] [Same Tree](https://leetcode.com/problems/same-tree/)
- [ ] [Invert/Flip Binary Tree](https://leetcode.com/problems/invert-binary-tree/)
- [ ] [Binary Tree Maximum Path Sum](https://leetcode.com/problems/binary-tree-maximum-path-sum/)
- [ ] [Binary Tree Level Order Traversal](https://leetcode.com/problems/binary-tree-level-order-traversal/)
- [ ] [Serialize and Deserialize Binary Tree](https://leetcode.com/problems/serialize-and-deserialize-binary-tree/)
- [ ] [Subtree of Another Tree](https://leetcode.com/problems/subtree-of-another-tree/)
- [ ] [Construct Binary Tree from Preorder and Inorder Traversal](https://leetcode.com/problems/construct-binary-tree-from-preorder-and-inorder-traversal/)
- [ ] [Validate Binary Search Tree](https://leetcode.com/problems/validate-binary-search-tree/)
- [ ] [Kth Smallest Element in a BST](https://leetcode.com/problems/kth-smallest-element-in-a-bst/)
- [ ] [Lowest Common Ancestor of BST](https://leetcode.com/problems/lowest-common-ancestor-of-a-binary-search-tree/)
- [ ] [Implement Trie (Prefix Tree)](https://leetcode.com/problems/implement-trie-prefix-tree/)
- [ ] [Add and Search Word](https://leetcode.com/problems/add-and-search-word-data-structure-design/)
- [ ] [Word Search II](https://leetcode.com/problems/word-search-ii/)

---

## Heap

- [ ] [Merge K Sorted Lists](https://leetcode.com/problems/mergeksortedlists/)
- [ ] [Top K Frequent Elements](https://leetcode.com/problems/topkfrequentelements/)
- [ ] [Find Median from Data Stream](https://leetcode.com/problems/findmedianfromdatastream/)

- [ ] [Merge K Sorted Lists](https://leetcode.com/problems/merge-k-sorted-lists/)
- [ ] [Top K Frequent Elements](https://leetcode.com/problems/top-k-frequent-elements/)
- [ ] [Find Median from Data Stream](https://leetcode.com/problems/find-median-from-data-stream/)