richard-to · June 11, 2021 15:44 · Jun 11, 2021 · Jun 11, 2021 · Jun 11, 2021 · Jun 11, 2021
diff --git a/LeetCodeQuestions.md b/LeetCodeQuestions.md
@@ -112,7 +112,7 @@
 - [x] [Lowest Common Ancestor of BST](https://leetcode.com/problems/lowest-common-ancestor-of-a-binary-search-tree/)
 - [x] [Implement Trie (Prefix Tree)](https://leetcode.com/problems/implement-trie-prefix-tree/)
 - [x] [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/)
+- [x] [Word Search II](https://leetcode.com/problems/word-search-ii/)
 
 ---
 

diff --git a/LeetCodeQuestions.md b/LeetCodeQuestions.md
@@ -111,7 +111,7 @@
 - [x] [Kth Smallest Element in a BST](https://leetcode.com/problems/kth-smallest-element-in-a-bst/)
 - [x] [Lowest Common Ancestor of BST](https://leetcode.com/problems/lowest-common-ancestor-of-a-binary-search-tree/)
 - [x] [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/)
+- [x] [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/)
 
 ---

diff --git a/LeetCodeQuestions.md b/LeetCodeQuestions.md
@@ -110,7 +110,7 @@
 - [x] [Validate Binary Search Tree](https://leetcode.com/problems/validate-binary-search-tree/)
 - [x] [Kth Smallest Element in a BST](https://leetcode.com/problems/kth-smallest-element-in-a-bst/)
 - [x] [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/)
+- [x] [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/)
 

diff --git a/LeetCodeQuestions.md b/LeetCodeQuestions.md
@@ -109,7 +109,7 @@
 - [x] [Construct Binary Tree from Preorder and Inorder Traversal](https://leetcode.com/problems/construct-binary-tree-from-preorder-and-inorder-traversal/)
 - [x] [Validate Binary Search Tree](https://leetcode.com/problems/validate-binary-search-tree/)
 - [x] [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/)
+- [x] [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/)

diff --git a/LeetCodeQuestions.md b/LeetCodeQuestions.md
@@ -108,7 +108,7 @@
 - [x] [Subtree of Another Tree](https://leetcode.com/problems/subtree-of-another-tree/)
 - [x] [Construct Binary Tree from Preorder and Inorder Traversal](https://leetcode.com/problems/construct-binary-tree-from-preorder-and-inorder-traversal/)
 - [x] [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/)
+- [x] [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/)

diff --git a/LeetCodeQuestions.md b/LeetCodeQuestions.md
@@ -107,7 +107,7 @@
 - [x] [Serialize and Deserialize Binary Tree](https://leetcode.com/problems/serialize-and-deserialize-binary-tree/)
 - [x] [Subtree of Another Tree](https://leetcode.com/problems/subtree-of-another-tree/)
 - [x] [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/)
+- [x] [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/)

diff --git a/LeetCodeQuestions.md b/LeetCodeQuestions.md
@@ -106,7 +106,7 @@
 - [x] [Binary Tree Level Order Traversal](https://leetcode.com/problems/binary-tree-level-order-traversal/)
 - [x] [Serialize and Deserialize Binary Tree](https://leetcode.com/problems/serialize-and-deserialize-binary-tree/)
 - [x] [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/)
+- [x] [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/)

diff --git a/LeetCodeQuestions.md b/LeetCodeQuestions.md
@@ -105,7 +105,7 @@
 - [x] [Binary Tree Maximum Path Sum](https://leetcode.com/problems/binary-tree-maximum-path-sum/)
 - [x] [Binary Tree Level Order Traversal](https://leetcode.com/problems/binary-tree-level-order-traversal/)
 - [x] [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/)
+- [x] [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/)

diff --git a/LeetCodeQuestions.md b/LeetCodeQuestions.md
@@ -104,7 +104,7 @@
 - [x] [Invert/Flip Binary Tree](https://leetcode.com/problems/invert-binary-tree/)
 - [x] [Binary Tree Maximum Path Sum](https://leetcode.com/problems/binary-tree-maximum-path-sum/)
 - [x] [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/)
+- [x] [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/)

diff --git a/LeetCodeQuestions.md b/LeetCodeQuestions.md
@@ -103,7 +103,7 @@
 - [ ] [Same Tree](https://leetcode.com/problems/same-tree/)
 - [x] [Invert/Flip Binary Tree](https://leetcode.com/problems/invert-binary-tree/)
 - [x] [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/)
+- [x] [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/)

diff --git a/LeetCodeQuestions.md b/LeetCodeQuestions.md
@@ -102,7 +102,7 @@
 - [x] [Maximum Depth of Binary Tree](https://leetcode.com/problems/maximum-depth-of-binary-tree/)
 - [ ] [Same Tree](https://leetcode.com/problems/same-tree/)
 - [x] [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/)
+- [x] [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/)

diff --git a/LeetCodeQuestions.md b/LeetCodeQuestions.md
@@ -101,7 +101,7 @@
 ## Tree
 - [x] [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/)
+- [x] [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/)

diff --git a/LeetCodeQuestions.md b/LeetCodeQuestions.md
@@ -99,7 +99,7 @@
 ---
 
 ## Tree
-- [ ] [Maximum Depth of Binary Tree](https://leetcode.com/problems/maximum-depth-of-binary-tree/)
+- [x] [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/)

diff --git a/LeetCodeQuestions.md b/LeetCodeQuestions.md
@@ -93,7 +93,7 @@
 - [x] [Valid Parentheses](https://leetcode.com/problems/valid-parentheses/)
 - [x] [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/)
+- [x] [Palindromic Substrings](https://leetcode.com/problems/palindromic-substrings/)
 - [ ] [Encode and Decode Strings (Leetcode Premium)](https://leetcode.com/problems/encode-and-decode-strings/)
 
 ---

diff --git a/LeetCodeQuestions.md b/LeetCodeQuestions.md
@@ -91,7 +91,7 @@
 - [x] [Valid Anagram](https://leetcode.com/problems/valid-anagram/)
 - [x] [Group Anagrams](https://leetcode.com/problems/group-anagrams/)
 - [x] [Valid Parentheses](https://leetcode.com/problems/valid-parentheses/)
-- [ ] [Valid Palindrome](https://leetcode.com/problems/valid-palindrome/)
+- [x] [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/)

diff --git a/LeetCodeQuestions.md b/LeetCodeQuestions.md
@@ -90,7 +90,7 @@
 - [x] [Minimum Window Substring](https://leetcode.com/problems/minimum-window-substring/)
 - [x] [Valid Anagram](https://leetcode.com/problems/valid-anagram/)
 - [x] [Group Anagrams](https://leetcode.com/problems/group-anagrams/)
-- [ ] [Valid Parentheses](https://leetcode.com/problems/valid-parentheses/)
+- [x] [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/)

diff --git a/LeetCodeQuestions.md b/LeetCodeQuestions.md
@@ -89,7 +89,7 @@
 - [x] [Longest Repeating Character Replacement](https://leetcode.com/problems/longest-repeating-character-replacement/)
 - [x] [Minimum Window Substring](https://leetcode.com/problems/minimum-window-substring/)
 - [x] [Valid Anagram](https://leetcode.com/problems/valid-anagram/)
-- [ ] [Group Anagrams](https://leetcode.com/problems/group-anagrams/)
+- [x] [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/)

diff --git a/LeetCodeQuestions.md b/LeetCodeQuestions.md
@@ -88,7 +88,7 @@
 - [x] [Longest Substring Without Repeating Characters](https://leetcode.com/problems/longest-substring-without-repeating-characters/)
 - [x] [Longest Repeating Character Replacement](https://leetcode.com/problems/longest-repeating-character-replacement/)
 - [x] [Minimum Window Substring](https://leetcode.com/problems/minimum-window-substring/)
-- [ ] [Valid Anagram](https://leetcode.com/problems/valid-anagram/)
+- [x] [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/)

diff --git a/LeetCodeQuestions.md b/LeetCodeQuestions.md
@@ -87,7 +87,7 @@
 
 - [x] [Longest Substring Without Repeating Characters](https://leetcode.com/problems/longest-substring-without-repeating-characters/)
 - [x] [Longest Repeating Character Replacement](https://leetcode.com/problems/longest-repeating-character-replacement/)
-- [ ] [Minimum Window Substring](https://leetcode.com/problems/minimum-window-substring/)
+- [x] [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/)

diff --git a/LeetCodeQuestions.md b/LeetCodeQuestions.md
@@ -86,7 +86,7 @@
 ## String
 
 - [x] [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/)
+- [x] [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/)

diff --git a/LeetCodeQuestions.md b/LeetCodeQuestions.md
@@ -85,7 +85,7 @@
 
 ## String
 
-- [ ] [Longest Substring Without Repeating Characters](https://leetcode.com/problems/longest-substring-without-repeating-characters/)
+- [x] [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/)

diff --git a/LeetCodeQuestions.md b/LeetCodeQuestions.md
@@ -42,7 +42,7 @@
 
 ## Graph
 
-- [ ] [Clone Graph](https://leetcode.com/problems/clone-graph/)
+- [x] [Clone Graph](https://leetcode.com/problems/clone-graph/)
 - [x] [Course Schedule](https://leetcode.com/problems/course-schedule/)
 - [x] [Pacific Atlantic Water Flow](https://leetcode.com/problems/pacific-atlantic-water-flow/)
 - [x] [Number of Islands](https://leetcode.com/problems/number-of-islands/)

diff --git a/LeetCodeQuestions.md b/LeetCodeQuestions.md
@@ -46,7 +46,7 @@
 - [x] [Course Schedule](https://leetcode.com/problems/course-schedule/)
 - [x] [Pacific Atlantic Water Flow](https://leetcode.com/problems/pacific-atlantic-water-flow/)
 - [x] [Number of Islands](https://leetcode.com/problems/number-of-islands/)
-- [ ] [Longest Consecutive Sequence](https://leetcode.com/problems/longest-consecutive-sequence/)
+- [x] [Longest Consecutive Sequence](https://leetcode.com/problems/longest-consecutive-sequence/)
 - [x] [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/)

diff --git a/LeetCodeQuestions.md b/LeetCodeQuestions.md
@@ -55,7 +55,7 @@
 
 ## Interval
 
-- [ ] [Insert Interval](https://leetcode.com/problems/insert-interval/)
+- [x] [Insert Interval](https://leetcode.com/problems/insert-interval/)
 - [x] [Merge Intervals](https://leetcode.com/problems/merge-intervals/)
 - [x] [Non-overlapping Intervals](https://leetcode.com/problems/non-overlapping-intervals/)
 - [x] [Meeting Rooms (Leetcode Premium)](https://leetcode.com/problems/meeting-rooms/)

diff --git a/LeetCodeQuestions.md b/LeetCodeQuestions.md
@@ -57,7 +57,7 @@
 
 - [ ] [Insert Interval](https://leetcode.com/problems/insert-interval/)
 - [x] [Merge Intervals](https://leetcode.com/problems/merge-intervals/)
-- [ ] [Non-overlapping Intervals](https://leetcode.com/problems/non-overlapping-intervals/)
+- [x] [Non-overlapping Intervals](https://leetcode.com/problems/non-overlapping-intervals/)
 - [x] [Meeting Rooms (Leetcode Premium)](https://leetcode.com/problems/meeting-rooms/)
 - [x] [Meeting Rooms II (Leetcode Premium)](https://leetcode.com/problems/meeting-rooms-ii/)
 

diff --git a/LeetCodeQuestions.md b/LeetCodeQuestions.md
@@ -56,7 +56,7 @@
 ## Interval
 
 - [ ] [Insert Interval](https://leetcode.com/problems/insert-interval/)
-- [ ] [Merge Intervals](https://leetcode.com/problems/merge-intervals/)
+- [x] [Merge Intervals](https://leetcode.com/problems/merge-intervals/)
 - [ ] [Non-overlapping Intervals](https://leetcode.com/problems/non-overlapping-intervals/)
 - [x] [Meeting Rooms (Leetcode Premium)](https://leetcode.com/problems/meeting-rooms/)
 - [x] [Meeting Rooms II (Leetcode Premium)](https://leetcode.com/problems/meeting-rooms-ii/)

diff --git a/LeetCodeQuestions.md b/LeetCodeQuestions.md
@@ -120,7 +120,7 @@
 
 - [ ] [Merge K Sorted Lists](https://leetcode.com/problems/merge-k-sorted-lists/)
 - [x] [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/)
+- [x] [Find Median from Data Stream](https://leetcode.com/problems/find-median-from-data-stream/)
 
 ## Important Link:
 [14 Patterns to Ace Any Coding Interview Question](https://hackernoon.com/14-patterns-to-ace-any-coding-interview-question-c5bb3357f6ed)
diff --git a/LeetCodeQuestions.md b/LeetCodeQuestions.md
@@ -119,7 +119,7 @@
 ## Heap
 
 - [ ] [Merge K Sorted Lists](https://leetcode.com/problems/merge-k-sorted-lists/)
-- [ ] [Top K Frequent Elements](https://leetcode.com/problems/top-k-frequent-elements/)
+- [x] [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/)
 
 ## Important Link:

diff --git a/LeetCodeQuestions.md b/LeetCodeQuestions.md
@@ -67,7 +67,7 @@
 
 - [x] [Reverse a Linked List](https://leetcode.com/problems/reverse-linked-list/)
 - [x] [Detect Cycle in a Linked List](https://leetcode.com/problems/linked-list-cycle/)
-- [x] [Merge Two Sorted Lists](https://leetcode.com/problems/merge-two-sorted-lists/)
+- [ ] [Merge Two Sorted Lists](https://leetcode.com/problems/merge-two-sorted-lists/)
 - [x] [Merge K Sorted Lists](https://leetcode.com/problems/merge-k-sorted-lists/)
 - [x] [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/)

diff --git a/LeetCodeQuestions.md b/LeetCodeQuestions.md
@@ -70,7 +70,7 @@
 - [x] [Merge Two Sorted Lists](https://leetcode.com/problems/merge-two-sorted-lists/)
 - [x] [Merge K Sorted Lists](https://leetcode.com/problems/merge-k-sorted-lists/)
 - [x] [Remove Nth Node From End Of List](https://leetcode.com/problems/remove-nth-node-from-end-of-list/)
-- [x] [Reorder List](https://leetcode.com/problems/reorder-list/)
+- [ ] [Reorder List](https://leetcode.com/problems/reorder-list/)
 
 ---
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