LeetCode-Solution

Array

ID	Title	Solution	Difficulty
1252	Cells with Odd Values in a Matrix	python	Easy
1243	Array Transformation	python	Easy
1196	How Many Apples Can You Put into the Basket	python	Easy
1228	Missing Number In Arithmetic Progression	python	Easy
1232	Check If It Is a Straight Line	python	Easy
905	Sort Array By Parity	python	Easy
1184	Distance Between Bus Stops	python	Easy
977	Squares of a Sorted Array	python	Easy
561	Array Partition I	python	Easy
922	Sort Array By Parity II	python	Easy
1229	Meeting Scheduler	python	Medium
509	Fibonacci Number	python	Easy
1002	Find Common Characters	python	Easy
985	Sum of Even Numbers After Queries	python	Easy
1200	Minimum Absolute Difference	python	Easy
1051	Height Checker	python	Easy
888	Fair Candy Swap	python	Easy
1207	Unique Number of Occurrences	python	Easy
1013	Partition Array Into Three Parts With Equal Sum	python	Easy
896	Monotonic Array	python	Easy
1222	Queens That Can Attack the King	python	Medium
1089	Duplicate Zeros	python	Easy
1131	Maximum of Absolute Value Expression	python	Medium
485	Max Consecutive Ones	python	Easy
283	Move Zeroes	python	Easy
457	Circular Array Loop	python	Medium
448	Find All Numbers Disappeared in an Array	python	Easy
169	Majority Element	python	Easy
217	Contains Duplicate	python	Easy
167	Two Sum II - Input array is sorted	python	Easy
661	Image Smoother	python	Easy
830	Positions of Large Groups	python	Easy
268	Missing Number	python	Easy
717	1-bit and 2-bit Characters	python	Easy
697	Degree of an Array	python	Easy
1010	Pairs of Songs With Total Durations Divisible by 60	python	Easy
628	Maximum Product of Three Numbers	python	Easy
27	Remove Element	python	Easy
121	Best Time to Buy and Sell Stock	python	Easy
122	Best Time to Buy and Sell Stock II	python	Easy
746	Min Cost Climbing Stairs	python	Easy
1137	N-th Tribonacci Number	python	Easy
53	Maximum Subarray	python	Easy
724	Find Pivot Index	python	Easy
35	Search Insert Position	python	Easy
1169	Invalid Transactions	python	Easy
1175	Prime Arrangements	python	Easy
1176	Diet Plan Performance	python	Easy
1180	Count Substrings with Only One Distinct Letter	python	Easy
1181	Before and After Puzzle	python	Medium
1177	Can Make Palindrome from Substring	python	Medium
1144	Decrease Elements To Make Array Zigzag	python	Medium
380	Insert Delete GetRandom O(1)	python	Medium
1277	Count Square Submatrices with All Ones	python	Medium
1163	Last Substring in Lexicographical Order	python	Hard
381	Insert Delete GetRandom O(1) - Duplicates allowed	python	Hard
986	Interval List Intersections	python	Medium
1156	Swap For Longest Repeated Character Substring	python	Medium
769	Max Chunks To Make Sorted	python	Medium
768	Max Chunks To Make Sorted II	python	Hard
1139	Largest 1-Bordered Square	python	Medium
1186	Maximum Subarray Sum with One Deletion	python	Medium
1191	K-Concatenation Maximum Sum	python	Medium
1250	Check If It Is a Good Array	python	Hard
1183	Maximum Number of Ones	python	Hard
782	Transform to Chessboard	python	Hard
902	Numbers At Most N Given Digit Set	python	Hard
1012	Numbers With Repeated Digits	python	Hard
689	Maximum Sum of 3 Non-Overlapping Subarrays	python	Hard

LinkedList

Recommend Order	ID	Title	Solution	Difficulty
1	#	LinkedList Structure	python	None
2	21	Merge Two Sorted Lists	python	Easy
3	203	Remove Linked List Elements	python	Easy
4	83	Remove Duplicates from Sorted List	python	Easy
5	876	Middle of the Linked List	python	Easy
6	141	Linked List Cycle	python	Easy
7	206	Reverse Linked List	python	Easy
8	234	Palindrome Linked List	python	Easy
9	707	Design Linked List	python	Easy
10	1171	Remove Zero Sum Consecutive Nodes from Linked List	python	Medium
11	86	Partition List	python	Medium
12	2	Add Two Numbers	python	Medium
13	19	Remove Nth Node From End of List	python	Medium
14	24	Swap Nodes in Pairs	python	Medium
15	328	Odd Even Linked List	python	Medium
16	109	Convert Sorted List to Binary Search Tree	python	Medium
17	147	Insertion Sort List	python	Medium
18	148	Sort List	python	Medium
19	92	Reverse Linked List II	python	Medium
20	82	Remove Duplicates from Sorted List II	python	Medium
21	142	Linked List Cycle II	python	Medium
22	143	Reorder List	python	Medium
23	61	Rotate List	python	Medium
24	25	Reverse Nodes in k-Group	python	Hard
25	23	Merge k Sorted Lists	python	Hard
26	382	Linked List Random Node	python	Medium
27	146	LRU Cache	python	Medium

String

ID	Title	Solution	Difficulty
1275	Find Winner on a Tic Tac Toe Game	python	Easy
1271	Hexspeak	python	Easy
1221	Split a String in Balanced Strings	python	Easy
972	Equal Rational Numbers	python	Hard

Math

ID	Title	Solution	Difficulty
1276	Number of Burgers with No Waste of Ingredients	python	Medium

Stack

ID	Title	Solution	Difficulty
20	Valid Parentheses	python	Easy
1047	Remove All Adjacent Duplicates In String	python	Easy
682	Baseball Game	python	Easy
1021	Remove Outermost Parentheses	python	Easy
844	Backspace String Compare	python	Easy
155	Min Stack	python	Easy
232	Implement Queue using Stacks	python	Easy
225	Implement Stack using Queues	python	Easy
496	Next Greater Element I	python	Easy
1190	Reverse Substrings Between Each Pair of Parentheses	python	Medium
1249	Minimum Remove to Make Valid Parentheses	python	Medium
1130	Minimum Cost Tree From Leaf Values	python	Medium
71	Simplify Path	python	Medium
1209	Remove All Adjacent Duplicates in String II	python	Medium

Backtrack

ID	Title	Solution	Difficulty
46	Permutations	python	Medium
47	Permutations II	python	Medium
78	Subsets	python	Medium
90	Subsets II	python	Medium
39	Combination Sum	python	Medium
40	Combination Sum II	python	Medium
216	Combination Sum III	python	Medium

HashSet

ID	Title	Solution	Difficulty
1213	Intersection of Three Sorted Arrays	python	Easy

HashMap

ID	Title	Solution	Difficulty
1185	Day of the Week	python	Easy
1217	Play with Chips	python	Easy
1189	Maximum Number of Balloons	python	Easy
1165	Single-Row Keyboard	python	Easy
1128	Number of Equivalent Domino Pairs	python	Easy
1247	Minimum Swaps to Make Strings Equal	python	Easy
1166	Design File System	python	Medium
930	Binary Subarrays With Sum	python	Medium
982	Triples with Bitwise AND Equal To Zero	python	Hard
1138	Alphabet Board Path	python	Medium
1124	Longest Well-Performing Interval	python	Medium
1152	Analyze User Website Visit Pattern	python	Medium
939	Minimum Area Rectangle	python	Medium
1224	Maximum Equal Frequency	python	Hard
1153	String Transforms Into Another String	python	Hard

SlidingWindow

ID	Title	Solution	Difficulty
1248	Count Number of Nice Subarrays	python	Medium
992	Subarrays with K Different Integers	python	Hard
1208	Get Equal Substrings Within Budget	python	Medium
1234	Replace the Substring for Balanced String	python	Medium

Bitwise

ID	Title	Solution	Difficulty
1238	Circular Permutation in Binary Representation	python	Medium
1178	Number of Valid Words for Each Puzzle	python	Hard

Hash

Recommend Order	ID	Title	Solution	Difficulty
1	796	Rotate String	python	Easy
2	686	Repeated String Match	python	Easy
3	1044	Longest Duplicate Substring	python	Hard

Tree

ID	Title	Solution	Difficulty
1214	Two Sum BSTs	python	Medium
1145	Binary Tree Coloring Game	python	Medium
1123	Lowest Common Ancestor of Deepest Leaves	python	Medium
1245	Tree Diameter	python	Medium
1273	Delete Tree Nodes	python	Medium
87	Scramble String	python	Hard

Trie

ID	Title	Solution	Difficulty
1233	Remove Sub-Folders from the Filesystem	python	Medium

Binary Search

ID	Title	Solution	Difficulty
1237	Find Positive Integer Solution for a Given Equation	python	Easy
1244	Design A Leaderboard	python	Medium
1146	Snapshot Array	python	Medium
1170	Compare Strings by Frequency of the Smallest Character	python	Medium
1182	Shortest Distance to Target Color	python	Medium
1157	Online Majority Element In Subarray	python	Hard
81	Search in Rotated Sorted Array II	python	Medium
1201	Ugly Number III	python	Medium
1274	Number of Ships in a Rectangle	python	Hard
154	Find Minimum in Rotated Sorted Array II	python	Hard
668	Kth Smallest Number in Multiplication Table	python	Hard
1231	Divide Chocolate	python	Hard
719	Find K-th Smallest Pair Distance	python	Hard

Sort

ID	Title	Solution	Difficulty
1272	Remove Interval	python	Medium
1122	Relative Sort Array	python	Easy
973	K Closest Points to Origin	python	Medium

DFS

ID	Title	Solution	Difficulty
1254	Number of Closed Islands	python	Medium
1219	Path with Maximum Gold	python	Medium
980	Unique Paths III	python	Hard

BFS

ID	Title	Solution	Difficulty
1129	Shortest Path with Alternating Colors	python	Medium
1215	Stepping Numbers	python	Medium
1162	As Far from Land as Possible	python	Medium
1197	Minimum Knight Moves	python	Medium
1210	Minimum Moves to Reach Target with Rotations	python	Hard
847	Shortest Path Visiting All Nodes	python	Hard

Greedy

ID	Title	Solution	Difficulty
1253	Reconstruct a 2-Row Binary Matrix	python	Medium
991	Broken Calculator	python	Medium
1147	Longest Chunked Palindrome Decomposition	python	Hard

Union Find

ID	Title	Solution	Difficulty
#	DSU Structure	python	None
1202	Smallest String With Swaps	python	Medium
947	Most Stones Removed with Same Row or Column	python	Medium
721	Accounts Merge	python	Medium
1135	Connecting Cities With Minimum Cost	python	Medium
1168	Optimize Water Distribution in a Village	python	Hard
924	Minimize Malware Spread	python	Hard

Graph

ID	Title	Solution	Difficulty
787	Cheapest Flights Within K Stops	python	Medium
1136	Parallel Courses	python	Hard
1203	Sort Items by Groups Respecting Dependencies	python	Hard
1192	Critical Connections in a Network	python	Hard

Dynamic Programming

ID	Title	Solution	Difficulty
1218	Longest Arithmetic Subsequence of Given Difference	python	Medium
1223	Dice Roll Simulation	python	Medium
1220	Count Vowels Permutation	python	Hard
1143	Longest Common Subsequence	python	Medium
931	Minimum Falling Path Sum	python	Medium
935	Knight Dialer	python	Medium
983	Minimum Cost For Tickets	python	Medium
1216	Valid Palindrome III	python	Hard
795	Number of Subarrays with Bounded Maximum	python	Medium
115	Distinct Subsequences	python	Hard
174	Dungeon Game	python	Hard
1140	Stone Game II	python	Medium
1000	Minimum Cost to Merge Stones	python	Hard
300	Longest Increasing Subsequence	python	Medium
354	Russian Doll Envelopes	python	Hard
368	Largest Divisible Subset	python	Medium
967	Numbers With Same Consecutive Differences	python	Medium
1155	Number of Dice Rolls With Target Sum	python	Medium
1239	Maximum Length of a Concatenated String with Unique Characters	python	Medium
1240	Tiling a Rectangle with the Fewest Squares	python	Hard
403	Frog Jump	python	Hard
464	Can I Win	python	Medium
1230	Toss Strange Coins	python	Medium
375	Guess Number Higher or Lower II	python	Medium
1235	Maximum Profit in Job Scheduling	python	Hard
1255	Maximum Score Words Formed by Letters	python	Hard
1278	Palindrome Partitioning III	python	Hard
940	Distinct Subsequences II	python	Hard
871	Minimum Number of Refueling Stops	python	Hard
1187	Make Array Strictly Increasing	python	Hard
1246	Palindrome Removal	python	Hard
188	Best Time to Buy and Sell Stock IV	python	Hard
956	Tallest Billboard	python	Hard
1125	Smallest Sufficient Team	python	Hard

Heap

ID	Title	Solution	Difficulty
1198	Find Smallest Common Element in All Rows	python	Medium
1167	Minimum Cost to Connect Sticks	python	Medium
1172	Dinner Plate Stacks	python	Hard
871	Minimum Number of Refueling Stops	python	Hard
857	Minimum Cost to Hire K Workers	python	Hard
786	K-th Smallest Prime Fraction	python	Hard
1199	Minimum Time to Build Blocks	python	Hard