LeetCode

Leetcode 解决方案

Solutions

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#	Solution	Tags	Difficulty	Remark
0001	Two Sum	Array,Hash Table	Easy
0002	Add Two Numbers	Recursion,Linked List,Math	Medium
0003	Longest Substring Without Repeating Characters	Hash Table,String,Sliding Window	Medium
0004	Median of Two Sorted Arrays	Array,Binary Search,Divide and Conquer	Hard
0005	Longest Palindromic Substring	String,Two Pointers,Dynamic Programming	Medium
0006	Zigzag Conversion	String	Medium
0007	Reverse Integer	Math	Medium
0008	String to Integer (atoi)	String	Medium
0009	Palindrome Number	Math	Easy
0010	Regular Expression Matching	Recursion,String,Dynamic Programming	Hard
0011	Container With Most Water	Greedy,Array,Two Pointers	Medium
0012	Integer to Roman	Hash Table,Math,String	Medium
0013	Roman to Integer	Hash Table,Math,String	Easy
0014	Longest Common Prefix	Trie,String	Easy
0015	3Sum	Array,Two Pointers,Sorting	Medium
0016	3Sum Closest	Array,Two Pointers,Sorting	Medium
0017	Letter Combinations of a Phone Number	Hash Table,String,Backtracking	Medium
0018	4Sum	Array,Two Pointers,Sorting	Medium
0019	Remove Nth Node From End of List	Linked List,Two Pointers	Medium
0020	Valid Parentheses	Stack,String	Easy
0021	Merge Two Sorted Lists	Recursion,Linked List	Easy
0022	Generate Parentheses	String,Dynamic Programming,Backtracking	Medium
0023	Merge k Sorted Lists	Linked List,Divide and Conquer,Heap (Priority Queue),Merge Sort	Hard
0024	Swap Nodes in Pairs	Recursion,Linked List	Medium
0025	Reverse Nodes in k-Group	Recursion,Linked List	Hard
0026	Remove Duplicates from Sorted Array	Array,Two Pointers	Easy
0027	Remove ELement from an Array	Array,Two Pointers	Easy
0028	Remove ELement from an Array	Array,Two Pointers	Easy
0029	Divide Two Integers	Math,Bit Manipulation	Medium
0035	Search Insert Position	Array,Binary Search	Easy
0039	Combination Sum	Array,Backtracking	Medium
0046	Permutations	Array,Backtracking	Medium
0050	Pow(x, n)	Math,Recursion	Medium
0058	Length Of Last Word	String	Easy
0023	Merge k Sorted Lists	Linked List,Divide and Conquer,Heap (Priority Queue),Merge Sort	Hard
0024	Swap Nodes in Pairs	Recursion,Linked List	Medium
0025	Reverse Nodes in k-Group	Recursion,Linked List	Hard
0023	Merge k Sorted Lists	Linked List,Divide and Conquer,Heap (Priority Queue)	Hard
0025	Reverse Nodes in k-Group	Recursion,Linked List	Hard
0036	Valid Sudoku	Array,Hash Table,Matrix	Medium
0049	Group Anagrams	Array,Hash Table,String, Sorting	Medium
0069	Sqrt(x)	Math,Binary Search	Easy
0078	Subsets	Array,Backtracking,Bit Manipulation	Medium
0083	Remove Duplicates from Sorted List	Linked List	Easy
0136	Single Number	Array, Bit Manipulation	Easy
0151	Reverse Words in a String	Two Pointers, Strings	Medium
0169	Majority Element	Array, Hash Table, Sorting, Divide and Conquer, Counting	Easy
0175	Combine Two Tables	Database	Easy
0181	Employees Earning More Than Their Managers	Database	Easy
0182	Duplicate Emails	Database	Easy
0183	Customers Who Never Order	Database	Easy
0184	Duplicate Emails	Database	Easy
0185	Customers Who Never Order	Database	Easy
0193	Valid Phone Numbers	Shell	Easy
0200	Number of Islands	Array, Depth-First Search, Breadth-First Search, Matrix	Medium
0231	Power of Two	Math, Recursion, Bit Manipulation	Easy
0258	Add Digits	Math, Simulation, Number Theory	Easy
0279	Perfect Squares	Math, Dynamic Programming,Breadth-First Search	Medium
0349	Intersection of Two Array	Array, Hash Table, Two POinters, Binary Search, Sorting	Easy
0463	Island Perimeter	Array, Depth-First Search, Breadth-First Search, Matrix	Easy
0506	Relative Ranks	Array, Sorting, Heap(Priority Queue)	Easy
0507	Perfect Number	Math	Easy
0509	Fibonacci Number	Array, Dynamic Programming, Breadth-First Search, Matrix	Easy
0709	To Lower Case	String	Easy
0728	Self Dividing Numbers	Math	Easy
0905	Sort Array By Parity	Array, Two Pointers,Sorting	Easy
1207	Unique Number of Occurrences	Array,Hash Table,	Easy
1208	Get Equal Substrings Within Budget	Strings,Binary Search,Sliding Window, Prefix Sum	Medium
1219	Path with Maximum Gold	Array,Backtracking,Matrix	Medium
1700	Number of Students Unable to Eat Lunch	Array,Stack,Queue,Simulation	Easy
1791	Find Center of Star Graph	Graph	Medium
2309	Greatest English Letter in Upper and Lower Case	Hash Table, String, Enumeration	Easy
2406	Divide Intervals Into Minimum Number of Groups	Array,Greedy,Sorting,Two Pointers,Heap,Prefix Sum	Medium
2670	Find the Distinct Difference Array	Array,Hash Table	Easy
2707	Extra Characters in a String	Array, Hash Table, String, Dynamic Programming, Trie	Medium
3034	Find the K-th Character in String Game I	Math,Bit Manipulation,Recursion, Simulation	Easy
3065	Minimum Operations to Exceed Threshold Value	Array	Easy
3074	Apple Redistribution into Boxes	Array,Greedy,Sorting	Medium
3075	Maximize Happiness of Selected Children	Array,Greedy,Sorting	Medium
3309	Maximum Possible Number by Binary Concatenation	Array,Bit Manipulation,Enumeration	Medium