LeetCode-Young
综合
1
HashMap VS BST
Advantages of Trie Data Structure
Trie
Lambda Expression
树和图
栈和队列
数组与字符串
链表
位操作
智力题
数学和概率
递归和动态规划
排序和查找
Catalan Number
中等难题
高难度题
Iterator
DP
L1
L2
L3
Introduction
Multithreading in Java
General
Stack
155 Min Stack
232-Implement Queue using Stacks
42-Trapping Rain Water
84 Largest Rectangle in Histogram
85 Maximal Rectangle
394 Decode String
32 Longest Valid Parentheses
255 Verify Preorder Sequence in Binary Search Tree
144 Binary Tree Preorder Traversal
739 Daily Temperatures
496 Next Greater Element I
503 Next Greater Element II
439 Ternary Expression Parser
Queue
621-Task Scheduler
582-Kill Process
353-Design Snake Game
346-Moving Average from Data Stream
363-Max Sum of Rectangle No Larger Than K
102 Binary Tree Level Order Traversal
378 Kth Smallest Element in a Sorted Matrix
Map
560-Subarray Sum Equals K
438 Find All Anagrams in a String
347 - Top K Frequent Elements
242 Valid Anagram
387 First Unique Character in a String
454 4Sum II
166 Fraction to Recurring Decimal
String
647 Palindromic Substrings
49 Group Anagrams
301 Remove Invalid Parentheses
76 Minimum Window Substring
159 Longest Substring with At Most Two Distinct Characters
179 Largest Number
Substring problems
38 Count and Say
556 Next Greater Element III
186 Reverse Words in a String II
161 One Edit Distance
544 Output Contest Matches
227 Basic Calculator II
127 Word Ladder
678 Valid Parenthesis String
43 Multiply Strings
151 Reverse Words in a String
205 Isomorphic Strings
93 Restore IP Addresses
65 Valid Number
555 Split Concatenated Strings
Array
53-Maximum Subarray
581 Shortest Unsorted Continuous Subarray
240 Search a 2D Matrix II
350 Intersection of Two Arrays II
287 Find the Duplicate Number
142 Linked List Cycle II
163 Missing Ranges
548 Split Array with Equal Sum
164 Maximum Gap
Tree
100-Same Tree
101-Symmetric Tree
104-Maximum Depth of Binary Tree
617-Merge Two Binary Trees
226-Invert Binary Tree
543-Diameter of Binary Tree
437 Path Sum III
112 Path Sum
113 Path Sum II
572 Subtree of Another Tree
538 Convert BST to Greater Tree
94 Binary Tree Inorder Traversal
337 House Robber III
236 Lowest Common Ancestor of a Binary Tree
98 Validate Binary Search Tree
230 Kth Smallest Element in a BST
114 Flatten Binary Tree to Linked List
124 Binary Tree Maximum Path Sum
315 Count of Smaller Numbers After Self
235 Lowest Common Ancestor of a Binary Search Tree
606 Construct String from Binary Tree
545 Boundary of Binary Tree
742 Closest Leaf in a Binary Tree
663 Equal Tree Partition
285 Inorder Successor in BST
103 Binary Tree Zigzag Level Order Traversal
536 Construct Binary Tree from String
450 Delete Node in a BST
666 Path Sum IV
156 Binary Tree Upside Down
107 Binary Tree Level Order Traversal II
109 Convert Sorted List to Binary Search Tree
Linked List
21-Merge Two Sorted Lists
206-Reverse Linked List
141-Linked List Cycle
148 Sort List
234 Palindrome Linked List
160 Intersection of Two Linked Lists
23 Merge k Sorted Lists
138 Copy List with Random Pointer
24 Swap Nodes in Pairs
92 Reverse Linked List II
86 Partition List
61 Rotate List
82 Remove Duplicates from Sorted List II
147 Insertion Sort List
143 Reorder List
Bit Manipulation
136-Single Number
461-Hamming Distance
191 Number of 1 Bits
190 Reverse Bits
371 Sum of Two Integers
89 Gray Code
476 Number Complement
29 Divide Two Integers
137 Single Number II
260 Single Number III
421 Maximum XOR of Two Numbers in an Array
Brainteaser
292-Nim Game
699 Falling Squares
Design
146-LRU Cache
208 Implement Trie (Prefix Tree)
297 Serialize and Deserialize Binary Tree
384 Shuffle an Array
535 Encode and Decode TinyURL
295 Find Median from Data Stream
DP
64 Minimum Path Sum
72 Edit Distance
312 Burst Balloons
309 Best Time to Buy and Sell Stock with Cooldown
746 Min Cost Climbing Stairs
264 Ugly Number II
313 Super Ugly Number
403 Frog Jump
651 4 Keys Keyboard
516 Longest Palindromic Subsequence
304 Range Sum Query 2D - Immutable
115 Distinct Subsequences
Best Time to Buy and Sell Stock
Graph
547 Friend Circles
200 Number of Islands
207 Course Schedule
694 Number of Distinct Islands
711 Number of Distinct Islands II
133 Clone Graph
269 Alien Dictionary
332 Reconstruct Itinerary
399 Evaluate Division
210 Course Schedule II
323 Number of Connected Components in an Undirected Graph
261 Graph Valid Tree
310 Minimum Height Trees
444 Sequence Reconstruction
743 Network Delay Time
684 Redundant Connection
685 Redundant Connection II
BackTrack
22 Generate Parentheses
51 N-Queens
Greedy
406 Queue Reconstruction by Height
134 Gas Station
334 Increasing Triplet Subsequence
738 Monotone Increasing Digits
759 Employee Free Time
484 Find Permutation
44 Wildcard Matching
714 Best Time to Buy and Sell Stock with Transaction Fee
Math
172 Factorial Trailing Zeroes
625 Minimum Factorization
246 Strobogrammatic Number
247 Strobogrammatic Number II
750 Number Of Corner Rectangles
60 Permutation Sequence
645 Set Mismatch
Heap
218 The Skyline Problem
692 Top K Frequent Words
373 Find K Pairs with Smallest Sums
215 Kth Largest Element in an Array
253 Meeting Rooms II
Search
329 Longest Increasing Path in a Matrix
130 Surrounded Regions
153 Find Minimum in Rotated Sorted Array
140 Word Break II
540 Single Element in a Sorted Array
Reservoir Sampling
382 Linked List Random Node
398 Random Pick Index
Reservoir Sampling
Union Find
737 Sentence Similarity II
721 Accounts Merge
305 Number of Islands II
Trie
648 Replace Words
211 Add and Search Word - Data structure design
Geometry
149 Max Points on a Line
HXSB
HX really sb
Sort
75 Sort Colors
280 Wiggle Sort
324 Wiggle Sort II
Math
Backtrack
77 Combinations
526 Beautiful Arrangement
*Imp_39. Combination Sum
78 Subsets
320 Generalized Abbreviation
37 Sudoku Solver
291 Word Pattern II
698 Partition to K Equal Sum Subsets
Backtracking
Design
173 Binary Search Tree Iterator
341 Flatten Nested List Iterator
284 Peeking Iterator
251 Flatten 2D Vector
348 Design Tic-Tac-Toe
170 Two Sum III - Data structure design
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535 Encode and Decode TinyURL
535.Encode and Decode TinyURL
https://leetcode.com/problems/encode-and-decode-tinyurl/solution/
1- HashMap ans int Cnt
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