題庫

共 333 道題目含解題說明

#	題目	難度	Rating	Topics
1	Two Sum	Easy	1116	arrayhash-table
2	Add Two Numbers	Medium	1395	linked-listmathrecursion
3	Longest Substring Without Repeating Characters	Medium	1533	hash-tablestringsliding-window
4	Median of Two Sorted Arrays	Hard	2028	arraybinary-searchdivide-and-conquer
5	Longest Palindromic Substring	Medium	1581	two-pointersstringdynamic-programming
6	Zigzag Conversion	Medium	1568	string
7	Reverse Integer	Medium	1413	math
8	String to Integer (atoi)	Medium	1545	string
9	Palindrome Number	Easy	1168	math
10	Regular Expression Matching	Hard	2025	stringdynamic-programmingrecursion
11	Container With Most Water	Medium	1704	arraytwo-pointersgreedy
12	Integer to Roman	Medium	1433	hash-tablemathstring
13	Roman to Integer	Easy	1258	hash-tablemathstring
14	Longest Common Prefix	Easy	1170	stringtrie
15	3Sum	Medium	1711	arraytwo-pointerssorting
16	3Sum Closest	Medium	1502	arraytwo-pointerssorting
17	Letter Combinations of a Phone Number	Medium	1460	hash-tablestringbacktracking
18	4Sum	Medium	1639	arraytwo-pointerssorting
19	Remove Nth Node From End of List	Medium	1474	linked-listtwo-pointers
20	Valid Parentheses	Easy	1211	stringstack
21	Merge Two Sorted Lists	Easy	1168	linked-listrecursion
22	Generate Parentheses	Medium	1648	stringdynamic-programmingbacktracking
23	Merge K Sorted Lists	Hard	1893	linked-listdivide-and-conquerheap-priority-queue+1
25	Reverse Nodes in k-Group	Hard	2011	linked-listrecursion
26	Remove Duplicates from Sorted Array	Easy	1169	arraytwo-pointers
27	Remove Element	Easy	1153	arraytwo-pointers
28	Find the Index of the First Occurrence in a String	Easy	1302	two-pointersstringstring-matching
30	Substring with Concatenation of All Words	Hard	2039	hash-tablestringsliding-window
31	Next Permutation	Medium	1560	arraytwo-pointers
32	Longest Valid Parentheses	Hard	2118	stringdynamic-programmingstack
33	Search in Rotated Sorted Array	Medium	1625	arraybinary-search
34	Find First and Last Position of Element in Sorted Array	Medium	1483	arraybinary-search
35	Search Insert Position	Easy	1164	arraybinary-search
36	Valid Sudoku	Medium	1422	arrayhash-tablematrix
37	Sudoku Solver	Hard	2313	arrayhash-tablebacktracking+1
39	Combination Sum	Medium	1469	arraybacktracking
40	Combination Sum II	Medium	1562	arraybacktracking
41	First Missing Positive	Hard	1944	arrayhash-table
42	Trapping Rain Water	Hard	2062	arraytwo-pointersdynamic-programming+2
43	Multiply Strings	Medium	1499	mathstringsimulation
44	Wildcard Matching	Hard	2100	stringdynamic-programminggreedy+1
45	Jump Game II	Medium	1618	arraydynamic-programminggreedy
46	Permutations	Medium	1519	arraybacktracking
47	Permutations II	Medium	1574	arraybacktracking
48	Rotate Image	Medium	1407	arraymathmatrix
49	Group Anagrams	Medium	1474	arrayhash-tablestring+1
50	Pow(x, n)	Medium	1460	mathrecursion
51	N-Queens	Hard	1797	arraybacktracking
52	N-Queens II	Hard	1843	backtracking
53	Maximum Subarray	Medium	1409	arraydynamic-programmingdivide-and-conquer
54	Spiral Matrix	Medium	1524	arraymatrixsimulation
55	Jump Game	Medium	1565	arraydynamic-programminggreedy
56	Merge Intervals	Medium	1551	arraysorting
57	Insert Interval	Medium	1541	array
58	Length of Last Word	Easy	1156	string
60	Permutation Sequence	Hard	1953	mathrecursion
61	Rotate List	Medium	1558	linked-listtwo-pointers
62	Unique Paths	Medium	1383	mathdynamic-programmingcombinatorics
63	Unique Paths II	Medium	1400	arraydynamic-programmingmatrix
64	Minimum Path Sum	Medium	1444	arraydynamic-programmingmatrix
65	Valid Number	Hard	1892	string
66	Plus One	Easy	1151	arraymath
67	Add Binary	Easy	1160	mathstringbit-manipulation+1
68	Text Justification	Hard	1657	arraystringsimulation
69	Sqrt(x)	Easy	1178	mathbinary-search
70	Climbing Stairs	Easy	1232	mathdynamic-programmingmemoization
71	Simplify Path	Medium	1532	stringstack
72	Edit Distance	Medium	1703	stringdynamic-programming
73	Set Matrix Zeroes	Medium	1390	arrayhash-tablematrix
74	Search a 2D Matrix	Medium	1478	arraybinary-searchmatrix
75	Sort Colors	Medium	1381	arraytwo-pointerssorting
76	Minimum Window Substring	Hard	1890	hash-tablestringsliding-window
77	Combinations	Medium	1483	backtracking
78	Subsets	Medium	1416	arraybacktrackingbit-manipulation
79	Word Search	Medium	1700	arraystringbacktracking+1
80	Remove Duplicates from Sorted Array II	Medium	1381	arraytwo-pointers
82	Remove Duplicates from Sorted List II	Medium	1509	linked-listtwo-pointers
83	Remove Duplicates from Sorted List	Easy	1169	linked-list
84	Largest Rectangle in Histogram	Hard	1949	arraystackmonotonic-stack
85	Maximal Rectangle	Hard	2188	arraydynamic-programmingstack+2
86	Partition List	Medium	1519	linked-listtwo-pointers
87	Scramble String	Hard	2264	stringdynamic-programming
88	Merge Sorted Array	Easy	1165	arraytwo-pointerssorting
90	Subsets II	Medium	1517	arraybacktrackingbit-manipulation
91	Decode Ways	Medium	1635	stringdynamic-programming
92	Reverse Linked List II	Medium	1559	linked-list
94	Binary Tree Inorder Traversal	Easy	1250	stacktreedepth-first-search+1
97	Interleaving String	Medium	1785	stringdynamic-programming
98	Validate Binary Search Tree	Medium	1490	treedepth-first-searchbinary-search-tree+1
100	Same Tree	Easy	1176	treedepth-first-searchbreadth-first-search+1
101	Symmetric Tree	Easy	1200	treedepth-first-searchbreadth-first-search+1
102	Binary Tree Level Order Traversal	Medium	1308	treebreadth-first-searchbinary-tree
103	Binary Tree Zigzag Level Order Traversal	Medium	1576	treebreadth-first-searchbinary-tree
104	Maximum Depth of Binary Tree	Easy	1116	treedepth-first-searchbreadth-first-search+1
105	Construct Binary Tree from Preorder and Inorder Traversal	Medium	1643	arrayhash-tabledivide-and-conquer+2
106	Construct Binary Tree from Inorder and Postorder Traversal	Medium	1660	arrayhash-tabledivide-and-conquer+2
107	Binary Tree Level Order Traversal II	Medium	1436	treebreadth-first-searchbinary-tree
108	Convert Sorted Array to Binary Search Tree	Easy	1281	arraydivide-and-conquertree+2
110	Balanced Binary Tree	Easy	1194	treedepth-first-searchbinary-tree
111	Minimum Depth of Binary Tree	Easy	1248	treedepth-first-searchbreadth-first-search+1
112	Path Sum	Easy	1181	treedepth-first-searchbreadth-first-search+1
114	Flatten Binary Tree to Linked List	Medium	1519	linked-liststacktree+2
115	Distinct Subsequences	Hard	1849	stringdynamic-programming
117	Populating Next Right Pointers in Each Node II	Medium	1628	linked-listtreedepth-first-search+2
118	Pascal's Triangle	Easy	1168	arraydynamic-programming
119	Pascal's Triangle II	Easy	1178	arraydynamic-programming
120	Triangle	Medium	1533	arraydynamic-programming
121	Best Time to Buy and Sell Stock	Easy	1487	arraydynamic-programming
122	Best Time to Buy and Sell Stock II	Medium	1486	arraydynamic-programminggreedy
123	Best Time to Buy and Sell Stock III	Hard	1977	arraydynamic-programming
124	Binary Tree Maximum Path Sum	Hard	1807	dynamic-programmingtreedepth-first-search+1
125	Valid Palindrome	Easy	1138	two-pointersstring
127	Word Ladder	Hard	2061	hash-tablestringbreadth-first-search
128	Longest Consecutive Sequence	Medium	1680	arrayhash-tableunion-find
129	Sum Root to Leaf Numbers	Medium	1399	treedepth-first-searchbinary-tree
130	Surrounded Regions	Medium	1706	arraydepth-first-searchbreadth-first-search+2
131	Palindrome Partitioning	Medium	1615	stringdynamic-programmingbacktracking
133	Clone Graph	Medium	1521	hash-tabledepth-first-searchbreadth-first-search+1
134	Gas Station	Medium	1767	arraygreedy
135	Candy	Hard	1750	arraygreedy
136	Single Number	Easy	1150	arraybit-manipulation
137	Single Number II	Medium	1710	arraybit-manipulation
138	Copy List with Random Pointer	Medium	1618	hash-tablelinked-list
139	Word Break	Medium	1673	arrayhash-tablestring+3
140	Word Break II	Hard	2081	hash-tablestringdynamic-programming+3
141	Linked List Cycle	Easy	1302	hash-tablelinked-listtwo-pointers
143	Reorder List	Medium	1532	linked-listtwo-pointersstack+1
144	Binary Tree Preorder Traversal	Easy	1258	stacktreedepth-first-search+1
145	Binary Tree Postorder Traversal	Easy	1214	stacktreedepth-first-search+1
146	LRU Cache	Medium	1793	hash-tablelinked-listdesign+1
148	Sort List	Medium	1636	linked-listtwo-pointersdivide-and-conquer+2
149	Max Points on a Line	Hard	1978	arrayhash-tablemath+1
150	Evaluate Reverse Polish Notation	Medium	1492	arraymathstack
151	Reverse Words in a String	Medium	1384	two-pointersstring
152	Maximum Product Subarray	Medium	1555	arraydynamic-programming
153	Find Minimum in Rotated Sorted Array	Medium	1485	arraybinary-search
155	Min Stack	Medium	1419	stackdesign
162	Find Peak Element	Medium	1536	arraybinary-search
167	Two Sum II - Input Array Is Sorted	Medium	1389	arraytwo-pointersbinary-search
169	Majority Element	Easy	1235	arrayhash-tabledivide-and-conquer+2
172	Factorial Trailing Zeroes	Medium	1399	math
173	Binary Search Tree Iterator	Medium	1569	stacktreedesign+3
188	Best Time to Buy and Sell Stock IV	Hard	2037	arraydynamic-programming
189	Rotate Array	Medium	1433	arraymathtwo-pointers
190	Reverse Bits	Easy	1149	divide-and-conquerbit-manipulation
191	Number of 1 Bits	Easy	1088	divide-and-conquerbit-manipulation
198	House Robber	Medium	1514	arraydynamic-programming
199	Binary Tree Right Side View	Medium	1454	treedepth-first-searchbreadth-first-search+1
200	Number of Islands	Medium	1580	arraydepth-first-searchbreadth-first-search+2
201	Bitwise AND of Numbers Range	Medium	1604	bit-manipulation
202	Happy Number	Easy	1188	hash-tablemathtwo-pointers
203	Remove Linked List Elements	Easy	1222	linked-listrecursion
205	Isomorphic Strings	Easy	1262	hash-tablestring
206	Reverse Linked List	Easy	1186	linked-listrecursion
207	Course Schedule	Medium	1656	depth-first-searchbreadth-first-searchgraph+1
208	Implement Trie (Prefix Tree)	Medium	1543	hash-tablestringdesign+1
209	Minimum Size Subarray Sum	Medium	1445	arraybinary-searchsliding-window+1
210	Course Schedule II	Medium	1681	depth-first-searchbreadth-first-searchgraph+1
211	Design Add and Search Words Data Structure	Medium	1758	stringdepth-first-searchdesign+1
212	Word Search II	Hard	1976	arraystringbacktracking+2
213	House Robber II	Medium	1608	arraydynamic-programming
215	Kth Largest Element in an Array	Medium	1508	arraydivide-and-conquersorting+2
217	Contains Duplicate	Easy	1160	arrayhash-tablesorting
218	The Skyline Problem	Hard	2452	arraydivide-and-conquerbinary-search+5
219	Contains Duplicate II	Easy	1320	arrayhash-tablesliding-window
221	Maximal Square	Medium	1638	arraydynamic-programmingmatrix
222	Count Complete Tree Nodes	Easy	1375	binary-searchtreedepth-first-search+1
224	Basic Calculator	Hard	2010	mathstringstack+1
226	Invert Binary Tree	Easy	1160	treedepth-first-searchbreadth-first-search+1
228	Summary Ranges	Easy	1192	array
230	Kth Smallest Element in a BST	Medium	1401	treedepth-first-searchbinary-search-tree+1
231	Power of Two	Easy	1154	mathbit-manipulationrecursion
232	Implement Queue using Stacks	Easy	1356	stackdesignqueue
234	Palindrome Linked List	Easy	1281	linked-listtwo-pointersstack+1
235	Lowest Common Ancestor of a Binary Search Tree	Medium	1333	treedepth-first-searchbinary-search-tree+1
236	Lowest Common Ancestor of a Binary Tree	Medium	1660	treedepth-first-searchbinary-tree
238	Product of Array Except Self	Medium	1480	arrayprefix-sum
239	Sliding Window Maximum	Hard	1860	arrayqueuesliding-window+2
240	Search a 2D Matrix II	Medium	1499	arraybinary-searchdivide-and-conquer+1
242	Valid Anagram	Easy	1151	hash-tablestringsorting
252	Meeting Rooms	Easy	1163	arraysorting
253	Meeting Rooms II	Medium	1582	arraytwo-pointersgreedy+3
260	Single Number III	Medium	1321	arraybit-manipulation
261	Graph Valid Tree	Medium	1620	depth-first-searchbreadth-first-searchunion-find+1
268	Missing Number	Easy	1114	arrayhash-tablemath+2
269	Alien Dictionary	Hard	1930	arraystringdepth-first-search+3
271	Encode and Decode Strings	Medium	1530	arraystringdesign
274	H-Index	Medium	1405	arraysortingcounting-sort
278	First Bad Version	Easy	1161	binary-searchinteractive
279	Perfect Squares	Medium	1529	mathdynamic-programmingbreadth-first-search
286	Walls and Gates	Medium	1638	arraybreadth-first-searchmatrix
287	Find the Duplicate Number	Medium	1689	arraytwo-pointersbinary-search+1
289	Game of Life	Medium	1529	arraymatrixsimulation
290	Word Pattern	Easy	1294	hash-tablestring
295	Find Median from Data Stream	Hard	1973	two-pointersdesignsorting+2
297	Serialize and Deserialize Binary Tree	Hard	1884	stringtreedepth-first-search+3
300	Longest Increasing Subsequence	Medium	1666	arraybinary-searchdynamic-programming
309	Best Time to Buy and Sell Stock with Cooldown	Medium	1708	arraydynamic-programming
312	Burst Balloons	Hard	2056	arraydynamic-programming
315	Count of Smaller Numbers After Self	Hard	2215	arraybinary-searchdivide-and-conquer+4
316	Remove Duplicate Letters	Medium	1568	stringgreedystack+1
322	Coin Change	Medium	1684	arraydynamic-programmingbreadth-first-search
323	Number of Connected Components in an Undirected Graph	Medium	1558	depth-first-searchbreadth-first-searchunion-find+1
329	Longest Increasing Path in a Matrix	Hard	1965	arraydynamic-programmingdepth-first-search+5
330	Patching Array	Hard	2073	arraygreedy
332	Reconstruct Itinerary	Hard	1858	depth-first-searchgrapheulerian-circuit
336	Palindrome Pairs	Hard	2311	arrayhash-tablestring+1
338	Counting Bits	Easy	1203	dynamic-programmingbit-manipulation
340	Longest Substring with At Most K Distinct Characters	Medium	1679	hash-tablestringsliding-window
347	Top K Frequent Elements	Medium	1540	arrayhash-tabledivide-and-conquer+5
352	Data Stream as Disjoint Intervals	Hard	1700	binary-searchdesignordered-set
355	Design Twitter	Medium	1479	hash-tablelinked-listdesign+1
371	Sum of Two Integers	Medium	1564	mathbit-manipulation
373	Find K Pairs with Smallest Sums	Medium	1710	arrayheap-priority-queue
374	Guess Number Higher or Lower	Easy	1100	binary-searchinteractive
377	Combination Sum IV	Medium	1609	arraydynamic-programming
378	Kth Smallest Element in a Sorted Matrix	Medium	1457	arraybinary-searchsorting+2
380	Insert Delete GetRandom O(1)	Medium	1571	arrayhash-tablemath+2
383	Ransom Note	Easy	1139	hash-tablestringcounting
389	Find the Difference	Easy	1215	hash-tablestringbit-manipulation+1
392	Is Subsequence	Easy	1282	two-pointersstringdynamic-programming
399	Evaluate Division	Medium	1747	arraystringdepth-first-search+4
402	Remove K Digits	Medium	1792	stringgreedystack+1
406	Queue Reconstruction by Height	Medium	1506	arraygreedysorting
407	Trapping Rain Water II	Hard	2200	arraybreadth-first-searchheap-priority-queue+1
408	Valid Word Abbreviation	Easy	1239	two-pointersstring
409	Longest Palindrome	Easy	1132	hash-tablestringgreedy
410	Split Array Largest Sum	Hard	1856	arraybinary-searchdynamic-programming+2
416	Partition Equal Subset Sum	Medium	1624	arraydynamic-programming
417	Pacific Atlantic Water Flow	Medium	1707	arraydepth-first-searchbreadth-first-search+1
421	Maximum XOR of Two Numbers in an Array	Medium	1712	arrayhash-tablebit-manipulation+1
424	Longest Repeating Character Replacement	Medium	1680	hash-tablestringsliding-window
427	Construct Quad Tree	Medium	1464	arraydivide-and-conquertree+1
433	Minimum Genetic Mutation	Medium	1671	hash-tablestringbreadth-first-search
435	Non-overlapping Intervals	Medium	1567	arraydynamic-programminggreedy+1
436	Find Right Interval	Medium	1416	arraybinary-searchsorting
438	Find All Anagrams in a String	Medium	1483	hash-tablestringsliding-window
450	Delete Node in a BST	Medium	1590	treebinary-search-treebinary-tree
452	Minimum Number of Arrows to Burst Balloons	Medium	1703	arraygreedysorting
455	Assign Cookies	Easy	1148	arraygreedysorting+1
461	Hamming Distance	Easy	1085	bit-manipulation
472	Concatenated Words	Hard	1945	arraystringdynamic-programming+2
477	Total Hamming Distance	Medium	1489	arraymathbit-manipulation
494	Target Sum	Medium	1679	arraydynamic-programmingbacktracking
495	Teemo Attacking	Easy	1323	arraysimulation
496	Next Greater Element I	Easy	1318	arrayhash-tablestack+1
502	IPO	Hard	2099	arraygreedysorting+1
503	Next Greater Element II	Medium	1513	arraystackmonotonic-stack
518	Coin Change II	Medium	1697	arraydynamic-programming
530	Minimum Absolute Difference in BST	Easy	1207	treedepth-first-searchbreadth-first-search+2
542	01 Matrix	Medium	1538	arraydynamic-programmingbreadth-first-search+1
543	Diameter of Binary Tree	Easy	1287	treedepth-first-searchbinary-tree
554	Brick Wall	Medium	1483	arrayhash-table
560	Subarray Sum Equals K	Medium	1621	arrayhash-tableprefix-sum
567	Permutation in String	Medium	1584	hash-tabletwo-pointersstring+1
572	Subtree of Another Tree	Easy	1377	treedepth-first-searchstring-matching+2
588	Design In-Memory File System	Hard	1894	hash-tablestringdesign+1
621	Task Scheduler	Medium	1667	arrayhash-tablegreedy+3
632	Smallest Range Covering Elements from K Lists	Hard	2093	arrayhash-tablegreedy+3
637	Average of Levels in Binary Tree	Easy	1186	treedepth-first-searchbreadth-first-search+1
643	Maximum Average Subarray I	Easy	1226	arraysliding-window
646	Maximum Length of Pair Chain	Medium	1544	arraydynamic-programminggreedy+1
647	Palindromic Substrings	Medium	1525	two-pointersstringdynamic-programming
658	Find K Closest Elements	Medium	1702	arraytwo-pointersbinary-search+2
676	Implement Magic Dictionary	Medium	1480	hash-tablestringdepth-first-search+1
678	Valid Parenthesis String	Medium	1700	stringdynamic-programmingstack+1
680	Valid Palindrome II	Easy	1290	two-pointersstringgreedy
684	Redundant Connection	Medium	1597	depth-first-searchbreadth-first-searchunion-find+1
693	Binary Number with Alternating Bits	Easy	1074	bit-manipulation
695	Max Area of Island	Medium	1470	arraydepth-first-searchbreadth-first-search+2
703	Kth Largest Element in a Stream	Easy	1360	treedesignbinary-search-tree+3
704	Binary Search	Easy	1162	arraybinary-search
713	Subarray Product Less Than K	Medium	1539	arraysliding-windowprefix-sum
719	Find K-th Smallest Pair Distance	Hard	1983	arraytwo-pointersbinary-search+1
721	Accounts Merge	Medium	1664	arrayhash-tablestring+4
733	Flood Fill	Easy	1139	arraydepth-first-searchbreadth-first-search+1
739	Daily Temperatures	Medium	1418	arraystackmonotonic-stack
743	Network Delay Time	Medium	1648	depth-first-searchbreadth-first-searchgraph+2
745	Prefix and Suffix Search	Hard	2002	hash-tablestringdesign+1
746	Min Cost Climbing Stairs	Easy	1167	arraydynamic-programming
759	Employee Free Time	Hard	1712	arraysortingheap-priority-queue
762	Prime Number of Set Bits in Binary Representations	Easy	1262	mathbit-manipulation
763	Partition Labels	Medium	1464	hash-tabletwo-pointersstring+1
778	Swim in Rising Water	Hard	2097	arraybinary-searchdepth-first-search+4
786	K-th Smallest Prime Fraction	Medium	1818	arraytwo-pointersbinary-search+2
787	Cheapest Flights Within K Stops	Medium	1786	dynamic-programmingdepth-first-searchbreadth-first-search+3
820	Short Encoding of Words	Medium	1623	arrayhash-tablestring+1
843	Guess the Word	Hard	1985	arraymathstring+2
846	Hand of Straights	Medium	1604	arrayhash-tablegreedy+1
852	Peak Index in a Mountain Array	Medium	1176	arraybinary-search
853	Car Fleet	Medium	1740	arraymathstack+2
860	Lemonade Change	Easy	1186	arraygreedy
875	Koko Eating Bananas	Medium	1765	arraybinary-search
876	Middle of the Linked List	Easy	1168	linked-listtwo-pointers
901	Online Stock Span	Medium	1708	stackdesignmonotonic-stack+1
904	Fruit Into Baskets	Medium	1709	arrayhash-tablesliding-window
907	Sum of Subarray Minimums	Medium	1823	arraydynamic-programmingstack+1
909	Snakes and Ladders	Medium	1962	arraybreadth-first-searchmatrix
918	Maximum Sum Circular Subarray	Medium	1777	arraydivide-and-conquerdynamic-programming+2
921	Minimum Add to Make Parentheses Valid	Medium	1248	stringstackgreedy
973	K Closest Points to Origin	Medium	1470	arraymathdivide-and-conquer+4
981	Time Based Key-Value Store	Medium	1676	hash-tablestringbinary-search+1
986	Interval List Intersections	Medium	1579	arraytwo-pointers
994	Rotting Oranges	Medium	1571	arraybreadth-first-searchmatrix
1004	Max Consecutive Ones III	Medium	1655	arraybinary-searchsliding-window+1
1011	Capacity To Ship Packages Within D Days	Medium	1725	arraybinary-search
1019	Next Greater Node In Linked List	Medium	1546	arraylinked-liststack+1
1029	Two City Scheduling	Medium	1441	arraygreedysorting
1032	Stream of Characters	Hard	1891	arraystringdesign+2
1046	Last Stone Weight	Easy	1172	arrayheap-priority-queue
1091	Shortest Path in Binary Matrix	Medium	1655	arraybreadth-first-searchmatrix
1143	Longest Common Subsequence	Medium	1727	stringdynamic-programming
1283	Find the Smallest Divisor Given a Threshold	Medium	1541	arraybinary-search
1288	Remove Covered Intervals	Medium	1375	arraygreedysorting
1343	Number of Sub-arrays of Size K and Average Greater Than or Equal to Threshold	Medium	1317	arraysliding-window
1353	Maximum Number of Events That Can Be Attended	Medium	1786	arraygreedysorting+1
1448	Count Good Nodes in Binary Tree	Medium	1438	treedepth-first-searchbreadth-first-search+1
1456	Maximum Number of Vowels in a Substring of Given Length	Medium	1263	stringsliding-window
1475	Final Prices With a Special Discount in a Shop	Easy	1225	arraystackmonotonic-stack
1584	Min Cost to Connect All Points	Medium	1605	arrayunion-findgraph+1
1675	Minimize Deviation in Array	Hard	2091	arraygreedyheap-priority-queue+1
1695	Maximum Erasure Value	Medium	1528	arrayhash-tablesliding-window
1851	Minimum Interval to Include Each Query	Hard	2286	arraybinary-searchsorting+1
1899	Merge Triplets to Form Target Triplet	Medium	1635	arraygreedy
1944	Number of Visible People in a Queue	Hard	2105	arraystackmonotonic-stack
2013	Detect Squares	Medium	1678	arrayhash-tabledesign+1
2090	K Radius Subarray Averages	Medium	1358	arraysliding-window
2104	Sum of Subarray Ranges	Medium	1504	arraystackmonotonic-stack
2260	Minimum Consecutive Cards to Pick Up	Medium	1415	arrayhash-tablesliding-window
2300	Successful Pairs of Spells and Potions	Medium	1476	arraytwo-pointersbinary-search+1
2461	Maximum Sum of Distinct Subarrays With Length K	Medium	1553	arrayhash-tablesliding-window
2516	Take K of Each Character From Left and Right	Medium	1660	hash-tablestringsliding-window
2866	Beautiful Towers II	Medium	1974	arraystackmonotonic-stack