leetcode_for_fun

Some awesome solutions to the problems of leetcode🏃‍

An ordinary person solves problems in an ordinary way!😂

BinarySearch:

No	Title	Level	Remarks	Solution(s)	Url
33	SearchInRotatedSortedArray	M		Java	url

Recursion:

No	Title	Level	Remarks	Solution(s)	Url
22	GenerateParentheses	M		Java	url

Backtrack:

No	Title	Level	Remarks	Solution(s)	Url
46	Permutations	M	A copy of the official answer😂	Java	url
78	Subsets	M	NormalRecursion ✔ Backtrack ✔	Java	url

DivideAndConquer :

No	Title	Level	Remarks	Solution(s)	Url
148	SortList	M	Merge-And-Sort	Java	url

DynamicProgramming:

No	Title	Level	Remarks	Solution(s)	Url
53	MaximumSubarray	E		Java	url
62	UniquePaths	M	Backtrack 👎 Run timeout DP 👌 To be optimized	Java	url
70	ClimbingStairs	E		Java	url

DoublePointer:

No	Title	Level	Remarks	Solution(s)	Url
31	NextPermutation	M		Java	url
11	ContainerWithMostWater	M		Java	url
15	ThreeSum	M	Should I call it TriplePointer?🧐	Java	url
16	ThreeSumClosest	M		Java	url
26	RemoveDuplicatesFromSortedArray	E		Java	url
88	MergeSortedArray	E	A copy of the official answer😂	Java	url
141	LinkedListCycle	E		Java	url

Hash:

No	Title	Level	Remarks	Solution(s)	Url
1	TwoSum	E		Java	url
142	LinkedListCycle_2	M	Set ✔ Floyd ❌	Java	url
169	MajorityElement	E	Hash	Java	url

LinkedHashMap:

No	Title	Level	Remarks	Solution(s)	Url
146	LRUCache	M	Implement of Redis LRU	Java	url

LinkedList:

No	Title	Level	Remarks	Solution(s)	Url
2	AddTwoNumbers	M		Java	url
21	MergeTwoSortedLists	E	I use loops instead of recursion	Java	url
23	MergeKSortedLists	H	Solutions: divide and conquer ✔ PriorityQueue ❌Not yet completed	Java	url
61	RotateList	M	Solutions: Stack ✔ Annular LinkList ✔	Java	url
160	IntersectionOfTwoLinkedLists	E		Java	url
206	ReverseLinkedList	E	Stack ✔ Loop ✔ Recursion 🤔 it's hard to figure out	Java	url

SlidingWindow:

No	Title	Level	Remarks	Solution(s)	Url
3	LongestSubstringWithoutRepeatingCharacters	M	To be optimized	Java	url

String:

No	Title	Level	Remarks	Solution(s)	Url
5	LongestPalindromicSubstring	M	It's better to use "Manacher" method	Java	url
8	StringToIntegerAtoi	M	Only use the method that made from multiple "if"😂.Maybe using regular expression is the best solution!	Java	url
14	LongestCommonPrefix(LCP)	E		Java	url
43	MultiplyStrings	M	Not yet completed ❌	Java	url

Queue:

No	Title	Level	Remarks	Solution(s)	Url
7	ReverseInteger	E		Java	url
9	PalindromeNumber	E		Java	url

Stack:

No	Title	Level	Remarks	Solution(s)	Url
20	ValidParentheses	E		Java	url
155	MinStack	E	impl a MinStack	Java	url

Array:

No	Title	Level	Remarks	Solution(s)	Url
54	SpiralMatrix	M	That's fun! It reminds me of the time when I was making games	Java	url
59	SpiralMatrix_2	M	Similar to the 👆 line	Java	url

BinaryTree:

No	Title	Level	Remarks	Solution(s)	Url
100	SameTree	E	Recursive traversal	Java	url
101	SymmetricTree	E	Recursion✔ Queue✔	Java	url
104	MaximumDepthOfBinaryTree	E	DFS✔ BFS ✔	Java	url
124	BinaryTreeMaximumPathSum	H	DFS	Java	url

Other:

No	Title	Level	Remarks	Solution(s)	Url
121	BestTimeToBuyAndSellStock	E	It's solved by using only one loop	Java	url
122	BestTimeToBuyAndSellStock_2	E		Java	url

XOR:

No	Title	Level	Remarks	Solution(s)	Url
136	SingleNumber	E		Java	url

Graph:

No	Title	Level	Remarks	Solution(s)	Url
200	NumberOfIslands	M	BFS✔ DFS✔	Java	url