/Leetcode_Python

Leetcode Python Solution. Those who Want to learn Python From Scratch check out the Website linked below. Good Luck.

Primary LanguagePythonGNU General Public License v3.0GPL-3.0

leetcode_Python

copyRight@Rajeev Ranjan

Links:

Websites
https://www.python.org/doc/ (Documentation Releases by Version)
https://www.python.org/downloads/ (Download the latest source release)
https://docs.python.org/3/tutorial/ (The Python Tutorial)
https://www.python.org/about/gettingstarted/ (Python For Beginners)
https://docs.python.org/3/library/ (The Python Standard Library)
https://wiki.python.org/moin/PythonPeriodicals (PythonPeriodicals)
https://packaging.python.org/ (Python Packaging User Guide)
https://pyvideo.org/ (Python related videos)
https://docs.python.org/3/ (Python 3.8.6rc1 documentation)

Notes:

Important
Python is an interpreted, high-level and general-purpose programming language. Created by Guido van Rossum and first released in 1991, Python's design philosophy emphasizes code readability with its notable use of significant whitespace.
Typing discipline: Duck, dynamic, gradual (since 3.5)
Designed by: Guido van Rossum
OS: Linux, macOS, Windows Vista (and newer) and more
Filename extensions: .py,.pyi,.pyc,.pyd,.pyo (prior to 3.5),.pyw,.pyz (since 3.5)

Table

# Title Solution Difficulty Tag
1 Two Sum C++ Easy Array / Hash Table
2 Add Two Numbers C++ Medium Linked List
3 Longest Substring Without Repeating Characters C++ Medium Hash Table / Two Pointers
4 Median of Two Sorted Arrays C++ Hard Array / Binary Search
5 Longest Palindromic Substring C++ Medium String
6 ZigZag Conversion C++ Medium String
7 Reverse Integer C++ Easy Math
8 String to Integer (atoi) C++ Medium String
9 Palindrome Number C++ Easy Math
10 Regular Expression Matching C++ Hard String / Dynamic Programming / Backtracking
11 Container With Most Water C++ Medium Array / Two Pointers
12 Integer to Roman C++ Medium String
13 Roman to Integer C++ Easy String
14 Longest Common Prefix C++ Easy String
15 3Sum C++ Medium Array / Two Pointers
16 3Sum Closest C++ Medium Array / Two Pointers
17 Letter Combinations of a Phone Number C++ Medium Backtracking / String
18 4Sum C++ Medium Array
19 Remove Nth Node From End of List C++ Medium Linked List / Two Pointers
20 Valid Parentheses C++ Easy Stack
21 Merge Two Sorted Lists C++ Easy Linked List
22 Generate Parentheses C++ Medium String / Backtracking
23 Merge k Sorted Lists C++ Hard Linked List / Heap
24 Swap Nodes in Pairs C++ Medium Linked List
25 Reverse Nodes in k-Group C++ Hard Linked List
26 Remove Duplicates from Sorted Array C++ Easy Array / Two Pointers
27 Remove Element C++ Easy Array / Two Pointers
28 Implement strStr() C++ Easy String
29 Implement strStr() C++ Easy String
31 Next Permutation C++ Medium Array
33 Search in Rotated Sorted Array C++ Medium Array / Binary Search
34 Search for a Range C++ Medium Array / Binary Search
35 Search Insert Position C++ Easy Array / Binary Search
36 Valid Sudoku C++ Medium Hash Table
37 Sudoku Solver C++ Medium Hash Table
38 Count and Say C++ Easy String
39 Combination Sum C++ Medium Array / Backtracking
40 Combination Sum II C++ Medium Array / Backtracking
41 First Missing Positive C++ Hard Array
42 Trapping Rain Water C++ Hard Array / Two Pointers / Stack
43 Multiply Strings C++ Medium String
44 Wildcard Matching C++ Hard String / Backtracking / Greedy
45 Jump Game II C++ Hard Array / Greedy
46 Permutations C++ Medium Backtracking
47 Permutations II C++ Medium Backtracking
48 Rotate Image C++ Medium Matrix
49 Group Anagrams C++ Medium Hash Table / String
50 Pow(x, n) C++ Medium Binary Search
51 Pow(x, n) C++ Medium Binary Search
52 Pow(x, n) C++ Medium Binary Search
53 Maximum Subarray C++ Easy Dynamic Programming / Array
54 Spiral Matrix C++ Medium Array
55 Jump Game C++ Medium Array / Greedy
56 Merge Intervals C++ Medium Array / Sort
57 Insert Interval C++ Hard Array / Sort
58 Length of Last Word C++ Easy String
59 Spiral Matrix II C++ Medium Array
60 Permutation Sequence C++ Medium Backtracking / Math
61 Rotate List C++ Medium Linked List / Two Pointers
62 Unique Paths C++ Medium Array / Dynamic Programming
63 Unique Paths II C++ Medium Array / Dynamic Programming
64 Minimum Path Sum C++ Medium Array / Dynamic Programming
65 Valid Number C++ Medium Array / Dynamic Programming
66 Plus One C++ Easy Array / Math
67 Add Binary C++ Easy String
68 Text Justification C++ Hard String
69 Sqrt(x) C++ Easy Binary Search / Math
70 Climbing Stairs C++ Easy Dynamic Programming
71 Simplify Path C++ Medium Stack / String
72 Edit Distance C++ Medium Stack / String
73 Set Matrix Zeroes C++ Medium Array
74 Search a 2D Matrix C++ Medium Array / Binary Search
75 Sort Colors C++ Medium Array / Two Pointers
76 Minimum Window Substring C++ Hard Hash Table / Two pointers / String
78 Subsets C++ Medium Array / Backtracking
79 Word Search C++ Medium Matrix / Backtracking
80 Remove Duplicates from Sorted Array II C++ Medium Array / Two Pointers
82 Remove Duplicates from Sorted List II C++ Medium Linked List
83 Remove Duplicates from Sorted List C++ Easy Linked List
84 Largest Rectangle in Histogram C++ Hard Array
85 Maximal Rectangle C++ Hard Array
86 Partition List C++ Medium Linked List
88 Merge Sorted Array C++ Easy Array / Two Pointers
90 Subsets II C++ Medium Array / Backtracking
91 Decode Ways C++ Medium Dynamic Programming / String
92 Reverse Linked List II C++ Medium Linked List
94 Binary Tree Inorder Traversal C++ Medium Tree / Stack
95 Unique Binary Search Trees II C++ Medium Tree
96 Unique Binary Search Trees C++ Hard Tree / DFS
97 Interleaving String C++ Hard Tree / DFS
98 Validate Binary Search Tree C++ Medium Tree
99 Recover Binary Search Tree C++ Hard Tree / DFS
100 Same Tree C++ Easy Tree / DFS
101 Symmetric Tree C++ Easy Tree
102 Binary Tree Level Order Traversal C++ Medium Tree / DFS / BFS
103 Binary Tree Zigzag Level Order Traversal C++ Medium Tree / BFS
104 Maximum Depth of Binary Tree C++ Easy Tree
105 Construct Binary Tree from Preorder and Inorder Traversal C++ Medium Array / Tree / DFS
106 Construct Binary Tree from Inorder and Postorder Traversal C++ Medium Linked List / DFS
107 Binary Tree Level Order Traversal II C++ Easy Tree
108 Convert Sorted Array to Binary Search Tree C++ Easy Tree / DFS
109 Convert Sorted List to Binary Search Tree C++ Medium Linked List / DFS
110 Balanced Binary Tree C++ Easy Tree / DFS
111 Minimum Depth of Binary Tree C++ Easy Tree
112 Path Sum C++ Easy Tree / DFS
113 Path Sum II C++ Medium Tree / DFS
114 Flatten Binary Tree to Linked List C++ Medium Tree / DFS
116 Populating Next Right Pointers in Each Node C++ Medium Tree / BFS
117 Populating Next Right Pointers in Each Node II C++ Medium Tree / Level-order Traversal
118 Pascal's Triangle C++ Easy Array
119 Pascal's Triangle II C++ Easy Array
120 Triangle C++ Medium Array / Dynamic Programming
121 Best Time to Buy and Sell Stock C++ Easy Array / Dynamic Programming
122 Best Time to Buy and Sell Stock C++ Hard Tree / DFS
123 Best Time to Buy and Sell Stock C++ Hard Tree / DFS
124 Binary Tree Maximum Path Sum C++ Hard Tree / DFS
125 Valid Palindrome C++ Easy String / Two Pointers
126 Word Ladder C++ Hard Array / Unoin Find
127 Word Ladder C++ Medium String / BFS
128 Longest Consecutive Sequence C++ Hard Array / Unoin Find
129 Sum Root to Leaf Numbers C++ Medium Tree / DFS / BFS
130 Surrounded Regions C++ Medium DFS / BFS / Union Find
131 Palindrome Partitioning C++ Medium Backtracking
132 Palindrome Partitioning C++ Easy Bit Manipulation
133 Clone Graph C++ Medium Graph / DFS / BFS
134 Gas Station C++ Medium Greedy
136 Single Number C++ Easy Bit Manipulation
137 Single Numberll C++ Medium Dynamic Programming
138 Copy List with Random Pointer C++ Medium Hash Table / Linked List
139 Word Break C++ Medium Dynamic Programming
140 Word BreakII C++ Medium Dynamic Programming
141 Linked List Cycle C++ Easy Linked List / Two Pointers
142 Linked List Cycle II C++ Medium Linked List / Two Pointers
143 Reorder List C++ Medium Linked List
144 Binary Tree Preorder Traversal C++ Medium Tree / Stack
145 Binary Tree Postorder Traversal C++ Hard Tree / Stack
146 LRU Cache C++ Hard Design
147 Insertion Sort List C++ Easy Stack / Design
148 Sort List C++ Easy Stack / Design
149 Max Points on a Line C++ Easy Stack / Design
151 Reverse Words in a String C++ Medium String
152 Maximum Product Subarray C++ Hard String / Two Pointers
153 Find Minimum in Rotated Sorted Array C++ Hard String / Two Pointers
154 Find Minimum in Rotated Sorted Array C++ Hard String / Two Pointers
155 Min Stack C++ Easy Stack / Design
157 Read N Characters Given Read4 C++ Easy String
158 Read N Characters Given Read4 II - Call multiple times C++ Hard String
159 Longest Substring with At Most Two Distinct Characters C++ Hard String / Two Pointers
160 Intersection of Two Linked Lists C++ Medium String
161 One Edit Distance C++ Medium String
162 Find Peak Element C++ Medium Binary Search
163 Missing Ranges C++ Medium Array
168 Excel Sheet Column Title C++ Easy Math
169 Majority Element C++ Easy Array
171 Excel Sheet Column Number C++ Easy Math
173 Binary Search Tree Iterator C++ Medium Tree / Stack / Design
186 Reverse Words in a String II C++ Medium String
191 Number of 1 Bits C++ Easy Bit Manipulation
198 House Robber C++ Easy Dynamic Programming
200 Number of Islands C++ Medium BFS / Union Find
205 Isomorphic Strings C++ Easy Hash Table
206 Reverse Linked List C++ Easy Linked List
207 Course Schedule C++ Medium Graph / BFS / Topological Sort
208 Implement Trie (Prefix Tree) C++ Medium Trie / Design
209 Minimum Size Subarray Sum C++ Medium Array / Two Pointers
210 Course Schedule II C++ Medium Graph / BFS / Topological Sort
211 Add and Search Word - Data structure design C++ Medium Design / Trie
212 Word Search II C++ Hard Backtracking / Trie
214 Shortest Palindrome C++ Hard String
215 Kth Largest Element in an Array C++ Medium Sort / Partition
221 Maximal Square C++ Medium Dynamic Programming / BFS
223 Rectangle Area C++ Medium Math
224 Basic Calculator C++ Hard String / Stack
226 Invert Binary Tree C++ Easy Tree
227 Basic Calculator II C++ Medium String
228 Summary Ranges C++ Medium Array
229 Majority Element II C++ Medium Array
230 Kth Smallest Element in a BST C++ Medium Tree
231 Power of Two C++ Easy Bit Manipulation
234 Palindrome Linked List C++ Easy Linked List / Two Pointers
235 Lowest Common Ancestor of a Binary Search Tree C++ Easy Tree
236 Lowest Common Ancestor of a Binary Tree C++ Medium Tree
238 Product of Array Except Self C++ Medium Array
239 Sliding Window Maximum C++ Hard Heap
240 Search a 2D Matrix II C++ Medium Binary Search / Divide and Conquer
244 Shortest Word Distance II C++ Medium Hash Table / Design
246 Strobogrammatic Number C++ Easy Hash Table / Math
247 Strobogrammatic Number II C++ Medium Math / Recursion
249 Group Shifted Strings C++ Medium String
251 Flatten 2D Vector C++ Medium Design
252 Meeting Rooms C++ Easy Sort
253 Meeting Rooms II C++ Medium Heap / Sort
255 Verify Preorder Sequence in Binary Search Tree C++ Medium Stack / Tree
257 Binary Tree Paths C++ Easy Tree / DFS / BFS
258 Add Digits C++ Easy Math
259 3Sum Smaller C++ Medium Array / Two Pointers
261 Graph Valid Tree C++ Medium Graph / BFS / DFS / Union Find
263 Ugly Number C++ Easy Math
264 Ugly Number II C++ Medium Dynamic Programming / Math
266 Palindrome Permutation C++ Easy Hash Table
267 Palindrome Permutation II C++ Medium Backtracking
268 Missing Number C++ Easy Array / Bit Manipulation
269 Alien Dictionary C++ Hard Graph / Topological Sort
270 Closest Binary Search Tree Value C++ Easy Tree / Binary Search
271 Encode and Decode Strings C++ Medium String / Design
272 Closest Binary Search Tree Value II C++ Hard Tree / Stack
273 Integer to English Words C++ Hard String
274 H-Index C++ Medium Sort
275 H-Index II C++ Medium Binary Search
276 Paint Fence C++ Easy Dynamic Programming
277 Find the Celebrity C++ Medium Array
278 First Bad Version C++ Easy Binary Search
279 Perfect Squares C++ Medium Math / Dynamic Programming
280 Wiggle Sort C++ Easy Array
281 Zigzag Iterator C++ Medium Design
282 Expression Add Operators C++ Hard Divide and Conquer
283 Move Zeroes C++ Easy Array / Two Pointers
284 Peeking Iterator C++ Medum Design
285 Inorder Successor in BST C++ Medium Tree
286 Walls and Gates C++ Medium BFS
289 Game of Life C++ Medium Array
290 Word Pattern C++ Easy Hash Table
293 Flip Game C++ Easy String
294 Flip Game II C++ Medium Backtracking
295 Find Median from Data Stream C++ Hard Heap / Design
297 Serialize and Deserialize Binary Tree C++ Hard Tree / Design
298 Binary Tree Longest Consecutive Sequence C++ Medium Tree
300 Longest Increasing Subsequence C++ Medium Binary Search / Dynamic Programming
301 Remove Invalid Parentheses C++ Hard Backtracking / DFS / BFS
303 Range Sum Query - Immutable C++ Easy Dynamic Programming
304 Range Sum Query 2D - Immutable C++ Medium Dynamic Programming
305 Number of Islands II C++ Hard Union Find
307 Range Sum Query - Mutable C++ Medium Segment Tree
309 Best Time to Buy and Sell Stock with Cooldown C++ Medium Dynamic Programming
310 Minimum Height Trees C++ Medium BFS/ Graph
311 Sparse Matrix Multiplication C++ Medium Matrix
313 Super Ugly Number C++ Medium Dynamic Programming / Math
314 Binary Tree Vertical Order Traversal C++ Medium BFS
315 Count of Smaller Numbers After Self C++ Hard Divide and Conqur / Binary Search Tree
317 Shortest Distance from All Buildings C++ Hard BFS
318 Maximum Product of Word Lengths C++ Medium Bit Manipulation
323 Number of Connected Components in an Undirected Graph C++ Medium Graph / Union Find / BFS / DFS
325 Maximum Size Subarray Sum Equals k C++ Medium Array / Hash Table
329 Longest Increasing Path in a Matrix C++ Hard DFS / Memorization
331 Verify Preorder Serialization of a Binary Tree C++ Medium Stack
332 Reconstruct Itinerary C++ Medium Graph / DFS
333 Largest BST Subtree C++ Medium Tree
334 Increasing Triplet Subsequence C++ Medium Array
336 Palindrome Pairs C++ Hard Hash Table / String / Trie
339 Nested List Weight Sum C++ Easy DFS
340 Longest Substring with At Most K Distinct Characters C++ Hard Hash Table / String
341 Flatten Nested List Iterator C++ Medium Stack / Design
344 Reverse String C++ Easy String
347 Top K Frequent Elements C++ Medium Hash Table / Heap
348 Design Tic-Tac-Toe C++ Medium Design
351 Android Unlock Patterns C++ Medium DFS / Dynamic Programming
354 Russian Doll Envelopes C++ Hard Binary Search / Dynamic Programming
355 Design Twitter C++ Medium Hash Table / Design
359 Logger Rate Limiter C++ Easy Hash Table / Design
360 Sort Transformed Array C++ Medium Math / Two Pointers
361 Bomb Enemy C++ Medium Dynamic Programming
362 Design Hit Counter C++ Medium Design
364 Nested List Weight Sum II C++ Medium DFS
369 Plus One Linked List C++ Medium Linked List
373 Find K Pairs with Smallest Sums C++ Medium Heap
377 Combination Sum IV C++ Medium Dynamic Programming
378 Kth Smallest Element in a Sorted Matrix C++ Medium Binary Search / Heap
380 Insert Delete GetRandom O(1) C++ Medium Hash Table / Design
382 Linked List Random Node C++ Medium Reservoir Sampling
394 Decode String C++ Medium String / DFS
398 Random Pick Index C++ Medium Reservoir Sampling
399 Evaluate Division C++ Medium Graph
402 Remove K Digits C++ Medium Greedy
404 Sum of Left Leaves C++ Easy Tree
408 Valid Word Abbreviation C++ Easy String
409 Longest Palindrome C++ Easy Hash Table
411 Minimum Unique Word Abbreviation C++ Hard Backtracking
412 Fizz Buzz C++ Easy Array
416 Partition Equal Subset Sum C++ Medium Dynamic Programming
417 Pacific Atlantic Water Flow C++ Medium DFS / BFS
418 Sentence Screen Fitting C++ Medium Dynamic Programming
433 Minimum Genetic Mutation C++ Medium BFS
435 Non-overlapping Intervals C++ Medium Greedy
436 Find Right Interval C++ Medium Array / Binary Search
438 Find All Anagrams in a String C++ Easy Hash Table
441 Arranging Coins C++ Easy Math
444 Sequence Reconstruction C++ Medium Graph / Topological Sort
450 Delete Node in a BST C++ Medium Tree
451 Sort Characters By Frequency C++ Medium Hash Table / Heap
461 Hamming Distance C++ Easy Bit Manipulation
467 Unique Substrings in Wraparound String C++ Medium Dynamic Programming
473 Matchsticks to Square C++ Medium DFS
477 Total Hamming Distance C++ Medium Bit Manipulation
482 License Key Formatting C++ Medium Array
484 Find Permutation C++ Medium Greedy
486 Predict the Winner C++ Medium Dynamic Programming / Minimax
487 Max Consecutive Ones II C++ Medium Two Pointers
489 Robot Room Cleaner C++ Hard DFS
490 The Maze C++ Medium BFS / DFS
494 Target Sum C++ Medium Backtracking
496 Next Greater Element I C++ Easy Stack
498 Diagonal Traverse C++ Medium Matrix
499 The Maze III C++ Hard DFS / BFS
503 Next Greater Element II C++ Medium Stack
505 The Maze II C++ Medium DFS / BFS
508 Most Frequent Subtree Sum C++ Medium Tree / Hash Table
513 Find Bottom Left Tree Value C++ Medium Tree / BFS / DFS
515 Find Largest Value in Each Tree Row C++ Medium Tree / BFS / DFS
523 Continuous Subarray Sum C++ Medium Dynamic Programming
524 Longest Word in Dictionary through Deleting C++ Medium Two Pointers
525 Contiguous Array C++ Medium Hash Table
531 Lonely Pixel I C++ Medium Array / DFS
535 Encode and Decode TinyURL C++ Medium String
536 Construct Binary Tree from String C++ Medium String / Tree
538 Convert BST to Greater Tree C++ Easy DFS
540 Single Element in a Sorted Array C++ Medium Array / Binary Search
541 Reverse String II C++ Easy String
542 01 Matrix C++ Medium BFS / DFS
543 Diameter of Binary Tree C++ Easy Tree
547 Friend Circles C++ Medium DFS / Union Find
549 Binary Tree Longest Consecutive Sequence II C++ Medium Tree
554 Brick Wall C++ Medium Hash Table
556 Next Greater Element III C++ Medium String
560 Subarray Sum Equals K C++ Medium Array / Map
562 Longest Line of Consecutive One in Matrix C++ Medium Array
565 Array Nesting C++ Medium Array
566 Reshape the Matrix C++ Easy Array
567 Permutation in String C++ Medium Two Pointers
572 Subtree of Another Tree C++ Easy Tree
582 Kill Process C++ Medium Tree / BFS / DFS
583 Delete Operation for Two Strings C++ Medium Dynamic Programming
599 Minimum Index Sum of Two Lists C++ Easy Hash Table
606 Construct String from Binary Tree C++ Easy Tree / String
611 Valid Triangle Number C++ Medium Array
616 Add Bold Tag in String C++ Medium String
621 Task Scheduler C++ Medium Array / Queue
632 Smallest Range C++ Hard Two Pointers
633 Sum of Square Numbers C++ Easy Math
635 Design Log Storage System C++ Medium String / Design
636 Exclusive Time of Functions C++ Medium Stack
637 Average of Levels in Binary Tree C++ Easy BFS
639 Decode Ways II C++ Hard Dynamic Programming
642 Design Search Autocomplete System C++ Hard Design / Trie
643 Maximum Average Subarray I C++ Easy Array
645 Set Mismatch C++ Easy Hash Table / Math
647 Palindromic Substrings C++ Medium String
648 Replace Words C++ Medium Hash Table / Trie
652 Find Duplicate Subtrees C++ Medium Tree
653 Two Sum IV - Input is a BST C++ Easy DFS
654 Maximum Binary Tree C++ Medium Tree
657 Judge Route Circle C++ Easy String
658 Find K Closest Elements C++ Medium Binary Search
659 Split Array into Consecutive Subsequences C++ Medium Greedy
662 Maximum Width of Binary Tree C++ Medium Tree / BFS / DFS
663 Equal Tree Partition C++ Medium Tree
665 Non-decreasing Array C++ Easy Array
669 Trim a Binary Search Tree C++ Easy Tree
670 Maximum Swap C++ Medium Array / Math
671 Second Minimum Node In a Binary Tree C++ Easy Tree
673 Number of Longest Increasing Subsequence C++ Medium Dynamic Programming
674 Longest Continuous Increasing Subsequence C++ Easy Array
676 Implement Magic Dictionary C++ Medium Hash Table / Trie
677 Map Sum Pairs C++ Medium Trie
679 24 Game C++ Hard DFS
680 Valid Palindrome II C++ Easy String
681 Next Closest Time C++ Medium String
683 K Empty Slots C++ Hard Array / Binary Search
684 Redundant Connection C++ Medium Graph / Union Find
685 Redundant Connection II C++ Hard Graph / DFS / Union Find
686 Repeated String Match C++ Easy String
687 Longest Univalue Path C++ Easy Tree / DFS
688 Knight Probability in Chessboard C++ Medium Dynamic Programming
689 Maximum Sum of 3 Non-Overlapping Subarrays C++ Hard Array / Dynamic Programming
690 Employee Importance C++ Easy Hash Table / BFS / DFS
692 Top K Frequent Words C++ Medium Hash Table / Heap
693 Binary Number with Alternating Bits C++ Easy Bit Manipulation
694 Number of Distinct Islands C++ Medium Hash Table / DFS
695 Max Area of Island C++ Easy Array / DFS
696 Count Binary Substrings C++ Easy String
697 Degree of an Array C++ Easy Array
701 Insert into a Binary Search Tree C++ Medium Array
713 Subarray Product Less Than K C++ Medium Array
717 1-bit and 2-bit Characters C++ Easy Array
718 Maximum Length of Repeated Subarray C++ Medium Array / Dynamic Programming
720 Longest Word in Dictionary C++ Easy Hash Table / Trie
723 Candy Crush C++ Medium Array / Two Pointers
724 Find Pivot Index C++ Easy Array
725 Split Linked List in Parts C++ Medium Linked List
728 Self Dividing Numbers C++ Easy Math
729 My Calendar I C++ Medium Array
733 Flood Fill C++ Easy DFS
734 Sentence Similarity C++ Easy Hash Table
735 Asteroid Collision C++ Medium Stack
739 Daily Temperatures C++ Medium Stack / Hash Table
740 Delete and Earn C++ Medium Dynamic Programming
742 Closest Leaf in a Binary Tree C++ Medium Tree / Graph
746 Min Cost Climbing Stairs C++ Easy Array / Dynamic Programming
747 Largest Number At Least Twice of Others C++ Easy Array
750 Number Of Corner Rectangles C++ Medium Dynamic Programming
753 Cracking the Safe C++ Hard DFS
758 Bold Words in String C++ Easy String
760 Find Anagram Mappings C++ Easy Hash Table
763 Partition Labels C++ Medium Two Pointers / Greedy
765 Couples Holding Hands C++ Hard Greedy / Union Find / Greedy
766 Toeplitz Matrix C++ Easy Array
769 Max Chunks To Make Sorted C++ Medium Array
771 Jewels and Stones C++ Easy Hash Table
773 Sliding Puzzle C++ Hard BFS
777 Swap Adjacent in LR String C++ Medium Brainteaser
779 K-th Symbol in Grammar C++ Medium Recursion
783 Minimum Distance Between BST Nodes C++ Easy Tree
784 Letter Case Permutation C++ Easy String
785 Is Graph Bipartite C++ Medium Graph
787 Cheapest Flights Within K Stops C++ Medium Graph / Heap
791 Custom Sort String C++ Medium String
792 Number of Matching Subsequences C++ Medium Array
797 All Paths From Source to Target C++ Medium DFS / Graph
798 Smallest Rotation with Highest Score C++ Hard Array
799 Champagne Tower C++ Medium Array
802 Find Eventual Safe States C++ Medium DFS / Graph
803 Bricks Falling When Hit C++ Hard Union Find
804 Unique Morse Code Words C++ Easy String
805 Split Array With Same Average C++ Hard Math
806 Number of Lines To Write String C++ Easy String
807 Max Increase to Keep City Skyline C++ Medium Array
809 Expressive Words C++ Medium String
814 Binary Tree Pruning C++ Medium Tree
815 Bus Routes C++ Hard BFS
819 Most Common Word C++ Easy String
820 Short Encoding of Words C++ Medium Trie
821 Shortest Distance to a Character C++ Easy String
826 Most Profit Assigning Work C++ Medium Two Pointers / Binary Search
830 Positions of Large Groups C++ Easy Array
832 Flipping an Image C++ Easy Array
834 Sum of Distances in Tree C++ Hard Tree / DFS
836 Rectangle Overlap C++ Easy Math
841 Keys and Rooms C++ Medium DFS / BFS / Graph
843 Guess the Word C++ Hard Minimax
844 Backspace String Compare C++ Easy Stack / Two Pointers
845 Longest Mountain in Array C++ Medium Two Pointers
846 Hand of Straights C++ Medium Map
848 Shifting Letters C++ Medium String
849 Maximize Distance to Closest Person C++ Easy Array
852 Peak Index in a Mountain Array C++ Easy Binary Search
853 Car Fleet C++ Medium Stack
855 Exam Room C++ Medium Map
857 Minimum Cost to Hire K Workers C++ Hard Heap
859 Buddy Strings C++ Easy String
872 Leaf-Similar Trees C++ Easy Tree / DFS
876 Middle of the Linked List C++ Easy Linked List
884 Uncommon Words from Two Sentences C++ Easy Hash Table
888 Fair Candy Swap C++ Easy Array
889 Construct Binary Tree from Preorder and Postorder Traversal C++ Medium Tree
890 Find and Replace Pattern C++ Medium String
894 All Possible Full Binary Trees C++ Medium Tree / Recursion
896 Monotonic Array C++ Easy Array
900 RLE Iterator C++ Medium Array
904 Fruit Into Baskets C++ Medium Two Pointers
911 Online Election C++ Medium Binary Search / Map
914 X of a Kind in a Deck of Cards C++ Easy Array / Math
916 Word Subsets C++ Medium String
925 Long Pressed Name C++ Easy String
929 Unique Email Addresses C++ Easy String
932 Beautiful Array C++ Medium Divide and Conquer
933 Number of Recent Calls C++ Easy Queue
935 Knight Dialer C++ Medium Dynamic Programming
938 Range Sum of BST C++ Medium Tree
939 Minimum Area Rectangle C++ Medium Hash Table
941 Valid Mountain Array C++ Easy Array
946 Validate Stack Sequences C++ Medium Stack
951 Flip Equivalent Binary Trees C++ Medium Tree