LeetCode

Problems

#	Difficulty	Title	Tag
1	Easy	Two Sum	Array, Hash Table
15	Medium	3 Sum	Array, Two Pointers
19	Medium	Remove Nth Node From End of List	Linked List
21	Easy	Merge Two Sorted Lists	Linked List
26	Easy	Remove Duplicates from Sorted Array	Array
33	Medium	Search in Rotated Sorted Array	Array, Binary Search
34	Medium	Find First and Last Position of Element in Sorted Array	Array, Binary Search
39	Medium	Combination Sum	Backtracking
46	Easy	Permutations	Backtracking
51	Hard	N-Queens	Backtracking
53	Medium	Maximum Subarray	Array, Dynamic Programming, Kadane Algorithm, Divide and Conquer
54	Medium	Spiral Matrix	Array
56	Medium	Merge Intervals	Array, Graph, Connected Component
62	Medium	Unique Paths	Dynamic Programming
66	Easy	Plus One	Array
69	Easy	Sqrt(x)	Binary Search
70	Easy	Climbing Stairs	Dynamic Programming
72	Hard	Edit Distance	Dynamic Programming
75	Hard	Sort Colors	Dynamic Programming
83	Easy	Remove Duplicates from Sorted List	Linked List
94	Medium	Binary Tree Inorder Traversal	Binary Tree, Morris Traversal
98	Medium	Validate Binary Search Tree	Linked List
101	Easy	Symmetric Tree	BFS
102	Medium	Binary Tree Level Order Traversal	BFS
104	Easy	Maximum Depth of Binary Tree	BST
108	Easy	Convert Sorted Array to Binary Search Tree	BST
110	Easy	Balanced Binary Tree	BST
112	Easy	Path Sum	Binary Tree
121	Easy	Best Time to Buy and Sell Stock	Dynamic Programming
122	Easy	Best Time to Buy and Sell Stock II	Array
125	Easy	Valid Palindrome	String, Two Pointers
130	Medium	Surrounded Regions	DFS
134	Medium	Gas Station	Array
141	Easy	Linked List Cycle	Linked List, Floyd's Cycle Finding Algorithm
144	Medium	Binary Tree Preorder Traversal	Binary Tree, Morris Traversal
145	Medium	Binary Tree Postorder Traversal	Binary Tree
146	Medium	LRU Cache	LinkedHashMap
150	Medium	Evaluate Reverse Polish Notation	Stack
151	Medium	Reverse Words in a String	String
160	Easy	Intersection of Two Linked Lists	Linked List
162	Medium	Find Peak Element	Array
167	Easy	Two Sum II - Input array is sorted	Array, Two Pointers
198	Medium	House Robber	Dynamic Programming
200	Medium	Number of Islands	2D Array, DFS
206	Easy	Reverse Linked List	Linked List
207	Medium	Course Schedule	Topological Sort
210	Medium	Course Schedule II	Topological Sort
215	Medium	Kth Largest Element in an Array	Heap, Quickselect
226	Easy	Invert Binary Tree	Array
230	Medium	Kth Smallest Element in a BST	Array
234	Easy	Palindrome Linked List	Linked List
235	Medium	Lowest Common Ancestor of a Binary Search Tree	Binary Search Tree
237	Easy	Delete Node in a Linked List	BST
238	Medium	Product of Array Except Self	Array
266	Easy	Palindrome Permutation	String
270	Easy	Closest Binary Search Tree Value	BST, Binary Search
283	Easy	Move Zeroes	Array
285	Medium	Inorder Successor in BST	BST
287	Medium	Find the Duplicate Number	Array, HashSet
322	Medium	Coin Change	Dynamic Programming
346	Easy	Moving Average from Data Stream	Queue
349	Easy	Intersection of Two Arrays	Array
359	Easy	Logger Rate Limiter	HashMap
383	Easy	Ransom Note	HashMap
387	Easy	First Unique Character in a String	String
392	Easy	Is Subsequence	Array, Two Pointers
443	Medium	String Compression	BST
450	Medium	Delete Node in a BST	BST
509	Easy	Fibonacci Number	Recursion
511	Easy	Game Play Analysis I	SQL
542	Medium	01 Matrix	BST
543	Easy	Diameter of Binary Tree	BST
547	Medium	Number of Provinces	Union Find
586	Easy	Customer Placing the Largest Number of Orders	SQL
595	Easy	Big Countries	SQL
613	Easy	Shortest Distance in a Line	SQL
622	Medium	Design Circular Queue	Array
627	Easy	Swap Salary	SQL
684	Medium	Redundant Connection	Union Find
701	Medium	Insert into a Binary Search Tree	BST
704	Easy	Binary Search	Array, Binary Search
709	Easy	To Lower Case	String
743	Medium	Network Delay Time	Dijkstra's Algorithm
746	Easy	Min Cost Climbing Stairs	Dynamic Programming
760	Easy	Find Anagram Mappings	Array, HashTable
771	Easy	Jewels and Stones	Array, HashSet
787	Medium	Cheapest Flights Within K Stops	Dijkstra's Algorithm
841	Medium	Keys and Rooms	DFS
845	Medium	Longest Mountain in Array	Array
896	Easy	Monotonic Array	Array
938	Easy	Range Sum of BST	BST
947	Medium	Most Stones Removed with Same Row or Column	Union Find
973	Medium	K Closest Points to Origin	Heap
977	Easy	Squares of a Sorted Array	Array, Two Pointers
994	Medium	Rotting Oranges	BST Pointers
1008	Medium	Construct Binary Search Tree from Preorder Traversal	BST
1020	Medium	Number of Enclaves	DFS
1069	Easy	Product Sales Analysis II	SQL
1091	Medium	Shortest Path in Binary Matrix	BFS
1108	Easy	Defanging an IP Address	String
1119	Easy	Remove Vowels from a String	String
1162	Medium	As Far from Land as Possible	String
1173	Easy	Single-Row Keyboard	String
1200	Easy	Minimum Absolute Difference	Array, Sorting
1303	Easy	Find the Team Size	SQL
1334	Medium	Find the City With the Smallest Number of Neighbors at a Threshold Distance	Dijkstra's Algorithm
1350	Easy	Students With Invalid Departments	SQL
1378	Easy	Replace Employee ID With The Unique Identifier	SQL
1431	Easy	Kids With the Greatest Number of Candies	Array
1464	Easy	Maximum Product of Two Elements in an Array	Array
1470	Easy	Shuffle the Array	Array
1480	Easy	Running Sum of 1d Array	Array
1512	Easy	Number of Good Pairs	Array
1571	Easy	Warehouse Manager	SQL
1581	Easy	Customer Who Visited but Did Not Make Any Transactions	SQL
1587	Easy	Bank Account Summary II	SQL
1623	Easy	All Valid Triplets That Can Represent a Country	SQL
1672	Easy	Richest Customer Wealth	Array
1683	Easy	Invalid Tweets	SQL
1693	Easy	Recyclable and Low Fat Products	SQL
1741	Easy	Find Total Time Spent by Each Employee	SQL
1757	Easy	Recyclable and Low Fat Products	SQL
1821	Easy	Find Customers With Positive Revenue this Year	SQL
1853	Easy	Convert Date Format	SQL

Snippets

Convert List to int[]

List<Integer> list = new ArrayList<>();
int[] array = list.stream().mapToInt(i->i).toArray();

Convert int[] to List

int[] nums = new int[]{1, 2, 3};
List<Integer> numList = Arrays.stream(nums).boxed().collect(Collectors.toList());

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Problems

Snippets

Convert List to int[]

Convert int[] to List

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