ID	Question	Submission Detail	Topics
1	Two Sum	Submission	Array, Hash Table
9	Palindrome Number	Submission	Math
20	Valid Parentheses	Submission	String, Stack
46	Permutations	Submission	Array, Backtracking
47	Permutations II	Submission	Array, Backtracking
70	Climbing Stairs	Submission	Math, Dynamic Programming, Memoization
50	Pow(x, n)	Submission	Math, Recursion
53	Maximum Subarray	Submission	Array, Divide and Conquer, Dynamic Programming
78	Subsets	Submission	Array, Backtracking, Bit Manipulation
91	Decode Ways	Submission	String, Dynamic Programming
94	Binary Tree Inorder Traversal	Submission	Stack, Tree, Depth-First Search, Binary Tree
98	Validate Binary Search Tree	Submission	Tree, Depth-First Search, Binary Search Tree, Binary Tree
101	Symmetric Tree	Submission	Tree, Depth-First Search, Breadth-First Search, Binary Tree
113	Path Sum II	Submission	Backtracking, Tree, Depth-First Search, Binary Tree
118	Pascal's Triangle	Submission	Array, Dynamic Programming
119	Pascal's Triangle II	Submission	Array, Dynamic Programming
129	Sum Root to Leaf Numbers	Submission	Tree, Depth-First Search, Binary Tree
136	Single Number	Submission	Array, Bit Manipulation
137	Single Number II	Submission	Array, Bit Manipulation
144	Binary Tree Preorder Traversal	Submission	Stack, Tree, Depth-First Search, Binary Tree
150	Evaluate Reverse Polish Notation	Submission	Array, Math, Stack
169	Majority Element	Submission	Array, Hash Table, Divide and Conquer, Sorting, Counting
198	House Robber	Submission	Array, Dynamic Programming
202	Happy Number	Submission	Hash Table, Math, Two Pointers
233	Number of Digit One	Submission	Math, Dynamic Programming, Recursion
242	Valid Anagram	Submission	Hash Table, String, Sorting
260	Single Number III	Submission	Array, Bit Manipulation
292	Nim Game	Submission	Math, Brainteaser, Game Theory
299	Bulls and Cows	Submission	Hash Table, String, Counting
328	Odd Even Linked List	Submission	Linked List
330	Patching Array	Submission	Array, Greedy
334	Increasing Triplet Subsequence	Submission	Array, Greedy
390	Elimination Game	Submission	Math, Recursion
404	Sum of Left Leaves	Submission	Tree, Depth-First Search, Breadth-First Search, Binary Tree
406	Queue Reconstruction by Height	Submission	Array, Binary Indexed Tree, Segment Tree, Sorting
409	Longest Palindrome	Submission	Hash Table, String, Greedy
437	Path Sum III	Submission	Tree, Depth-First Search, Binary Tree
440	K-th Smallest in Lexicographical Order	Submission	Trie
455	Assign Cookies	Submission	Array, Two Pointers, Greedy, Sorting
513	Find Bottom Left Tree Value	Submission	Tree, Depth-First Search, Breadth-First Search, Binary Tree
606	Construct String from Binary Tree	Submission	String, Tree, Depth-First Search, Binary Tree
650	2 Keys Keyboard	Submission	Math, Dynamic Programming
678	Valid Parenthesis String	Submission	String, Dynamic Programming, Stack, Greedy
791	Custom Sort String	Submission	Hash Table, String, Sorting
938	Range Sum of BST	Submission	Tree, Depth-First Search, Binary Search Tree, Binary Tree
979	Distribute Coins in Binary Tree	Submission	Tree, Depth-First Search, Binary Tree
1026	Maximum Difference Between Node and Ancestor	Submission	Tree, Depth-First Search, Binary Tree
1051	Height Checker	Submission	Array, Sorting, Counting Sort
1105	Filling Bookcase Shelves	Submission	Array, Dynamic Programming
1160	Find Words That Can Be Formed by Characters	Submission	Array, Hash Table, String
1266	Minimum Time Visiting All Points	Submission	Array, Math, Geometry
1287	Element Appearing More Than 25% In Sorted Array	Submission	Array
1325	Delete Leaves With a Given Value	Submission	Tree, Depth-First Search, Binary Tree
1347	Minimum Number of Steps to Make Two Strings Anagram	Submission	Hash Table, String, Counting
1404	Number of Steps to Reduce a Number in Binary Representation to One	Submission	String, Bit Manipulation
1422	Maximum Score After Splitting a String	Submission	String
1436	Destination City	Submission	Array, Hash Table, String
1464	Maximum Product of Two Elements in an Array	Submission	Array, Sorting, Heap (Priority Queue)
1524	Number of Sub-arrays With Odd Sum	Submission	Array, Math, Dynamic Programming, Prefix Sum
1598	Crawler Log Folder	Submission	Array, String, Stack
1608	Special Array With X Elements Greater Than or Equal X	Submission	Array, Binary Search, Sorting
1637	Widest Vertical Area Between Two Points Containing No Points	Submission	Array, Sorting
1653	Minimum Deletions to Make String Balanced	Submission	String, Dynamic Programming, Stack
1662	Check If Two String Arrays are Equivalent	Submission	Array, String
1673	Find the Most Competitive Subsequence	Submission	Array, Stack, Greedy, Monotonic Stack
1701	Average Waiting Time	Submission	Array, Simulation
1716	Calculate Money in Leetcode Bank	Submission	Math
1758	Minimum Changes To Make Alternating Binary String	Submission	String
1768	Merge Strings Alternately	Submission	Two Pointers, String
1769	Minimum Number of Operations to Move All Balls to Each Box	Submission	Array, String, Prefix Sum
1780	Check if Number is a Sum of Powers of Three	Submission	Math
1800	Maximum Ascending Subarray Sum	Submission	Array
1814	Count Nice Pairs in an Array	Submission	Array, Hash Table, Math, Counting
1863	Sum of All Subset XOR Totals	Submission	Array, Math, Backtracking, Bit Manipulation, Combinatorics, Enumeration
1903	Largest Odd Number in String	Submission	Math, String, Greedy
1913	Maximum Product Difference Between Two Pairs	Submission	Array, Sorting
1915	Number of Wonderful Substrings	Submission	Hash Table, String, Bit Manipulation, Prefix Sum
1980	Find Unique Binary String	Submission	Array, String, Backtracking
2000	Reverse Prefix of Word	Submission	Two Pointers, String
2037	Minimum Number of Moves to Seat Everyone	Submission	Array, Greedy, Sorting
2108	Find First Palindromic String in the Array	Submission	Array, Two Pointers, String
2125	Number of Laser Beams in a Bank	Submission	Array, Math, String, Matrix
2149	Rearrange Array Elements by Sign	Submission	Array, Two Pointers, Simulation
2185	Counting Words With a Given Prefix	Submission	Array, String, String Matching
2264	Largest 3-Same-Digit Number in String	Submission	String
2265	Count Nodes Equal to Average of Subtree	Submission	Tree, Depth-First Search, Binary Tree
2331	Evaluate Boolean Binary Tree	Submission	Tree, Depth-First Search, Binary Tree
2342	Max Sum of a Pair With Equal Sum of Digits	Submission	Array, Hash Table, Sorting, Heap (Priority Queue)
2425	Bitwise XOR of All Pairings	Submission	Array, Bit Manipulation, Brainteaser
2460	Apply Operations to an Array	Submission	Array, Two Pointers, Simulation
2486	Append Characters to String to Make Subsequence	Submission	Two Pointers, String, Greedy
2487	Remove Nodes From Linked List	Submission	Linked List, Stack, Recursion, Monotonic Stack
2559	Count Vowel Strings in Ranges	Submission	Array, String, Prefix Sum
2570	Merge Two 2D Arrays by Summing Values	Submission	Array, Hash Table, Two Pointers
2579	Count Total Number of Colored Cells	Submission	Math
2597	The Number of Beautiful Subsets	Submission	Array, Dynamic Programming, Backtracking, Sorting
2683	Neighboring Bitwise XOR	Submission	Array, Bit Manipulation
2706	Buy Two Chocolates	Submission	Array, Sorting
2816	Double a Number Represented as a Linked List	Submission	Linked List, Math, Stack
2825	Make String a Subsequence Using Cyclic Increments	Submission	Two Pointers, String
2997	Minimum Number of Operations to Make Array XOR Equal to K	Submission	Array, Bit Manipulation
3016	Minimum Number of Pushes to Type Word II	Submission	Hash Table, String, Greedy, Sorting, Counting
3068	Find the Maximum Sum of Node Values	Submission	Array, Dynamic Programming, Greedy, Bit Manipulation, Tree, Sorting
3075	Maximize Happiness of Selected Children	Submission	Array, Greedy, Sorting
3110	Score of a String	Submission	String
3151	Special Array I	Submission	Array
3168	Minimum Number of Chairs in a Waiting Room	Submission	String, Simulation
3174	Clear Digits	Submission	String, Stack, Simulation
3178	Find the Child Who Has the Ball After K Seconds	Submission	Math, Simulation
3191	Minimum Operations to Make Binary Array Elements Equal to One I	Submission	Array, Bit Manipulation, Queue, Sliding Window, Prefix Sum