126 Easy307 Med20 Hard
Showing 453 questions
453 questions
1
Sum of Elements Greater Than K
Introduction to Arrays•Array Traversal
easy Solve
2
Pairs With Total High Calorie
Introduction to Arrays•Brute Force
medium Solve
3
Find Indices of Pair Sum
Introduction to Arrays•Brute Force
medium Solve
4
Calculate Total Temperature
Introduction to Arrays•Array Traversal
easy Solve
5
Recursive Linked List Value Transformation
Linked Lists•Recursive Approach
medium Solve
6
Minimize Equipment Collection Trips
Heap and Priority Queue•Heap Operations
hard Solve
7
Filter Linked List Nodes by Timestamp
Linked Lists•Recursive Approach
easy Solve
8
Maximum Link List Frequencies
Linked Lists•Recursive Approach
easy Solve
9
Remove Duplicate Nodes from Linked List
Linked Lists•Recursive Approach
medium Solve
10
Top K Elements in Stream
Heap and Priority Queue•Heap Operations
medium Solve
11
Collect Linked List Node Values Recursively
Linked Lists•Recursive Approach
medium Solve
12
Max Priority Queue Operations
Heap and Priority Queue•Heap Operations
easy Solve
13
Optimal Key Sequence
Backtracking•Mixed
medium Solve
14
Minimum Sum Subarray
Arrays•Sliding Window
medium Solve
15
Prioritized Array Reordering
Stack•Mixed
medium Solve
16
Maximum Non-overlapping Substring Matches
Strings•Mixed
medium Solve
17
Generate Parenthesis Combinations
Stack•Mixed
medium Solve
18
Adjacent Color Configuration
Backtracking•Mixed
medium Solve
19
Priority Queue Management
Queue•Mixed
medium Solve
20
Cyclic List Shift Operation
Linked List•Mixed
medium Solve
21
Minimum Spanning Tree Construction
Graphs•Mixed
medium Solve
22
Capacity Sorted Tables
Arrays•Merge Sort / Quick Sort
medium Solve
23
Max Consecutive Same Type
Sliding Window•Mixed
medium Solve
24
Unified List Reconstruction
Linked List•Mixed
medium Solve
25
Reverse Substring Concatenation
Strings•Mixed
medium Solve
26
Detect Duplicate Values
Hashing•Mixed
medium Solve
27
Pair Sum Combinations
Two Pointers•Mixed
medium Solve
28
Alternate Node Reordering
Linked List•Mixed
medium Solve
29
Minimum Transpositions to Palindrome
Strings•Mixed
medium Solve
30
Interior Word Reversal
Strings•Mixed
medium Solve
31
Reversible Substring Pairs
Recursion•Mixed
medium Solve
32
Rectangular Pattern Painter
Backtracking•Mixed
medium Solve
33
Travel Itinerary Combinations
Backtracking•Mixed
medium Solve
34
Reverse Index Pairs Count
Arrays•Mixed
medium Solve
35
Sequence Index Finder
Binary Search•Mixed
medium Solve
36
Alternating Maximum Minimum Stack Operation
Arrays•Stack LIFO
medium Solve
37
Reverse Character Groups
Strings•STRREV 1001
medium Solve
38
Generate Anagrammed IDs
Strings•TOOL RETURNED ID
medium Solve
39
Corrupted String Recovery
Strings•RECOVER 1777831512659
medium Solve
40
Container With Maximum Volume
Two Pointers•Mixed
medium Solve
41
Array Reflection Height Maximization
Arrays•Pattern recognition and array traversal
medium Solve
42
Optimal Weighted Sum Subsequence
Introduction to Arrays•Mixed
medium Solve
43
Rearrange Seats by Rating
Arrays•pattern sorting by custom criteria
medium Solve
44
Min Length Subarray with Bounded Average
Arrays•Subarray
medium Solve
45
Palindrome Substring Enumeration
M Mixed Topics•String Operations
easy Solve
46
Substring Replacement Operation
M Mixed Topics•String Operations
easy Solve
47
Alternate Color Swapping
Arrays•Array Transformations
medium Solve
48
Triplet Sum With Middle Element Constraint
Two Pointers•Two Pointers Search
hard Solve
49
Alternate Element Rearrangement
Introduction to Arrays•Array Operations
easy Solve
50
Identical Sum Pairs
M Mixed Topics•Two Pointers Meet Arrays
hard Solve
51
Contiguous Unique Element Counts
Introduction to Arrays•Mixed
medium Solve
52
Minimal Coverage Substring
M Mixed Topics•String and Two Pointers Operations
hard Solve
53
Minimum Unique Material Identifiers
Arrays•NEW OR EXISTING ID
medium Solve
54
Duplicate Element Index
Arrays•Array Search
medium Solve
55
Unique Identifier Allocation
Arrays
medium Solve
56
Maximum Subarray Sum
Stack
medium Solve
57
Expiring Item Filter
Hashing•Mixed
medium Solve
58
Minimize Colorful Sequence Rearrangement
M Mixed Topics•Two Pointers Meet Arrays
hard Solve
59
Optimal Stage Index Shifts
Arrays•NEW OR EXISTING ID
medium Solve
60
Missing Elements in Sorted Arrays
M Mixed Topics•Two Pointers Meet Arrays
hard Solve
61
Lexicographically Smallest Replacement String
M Mixed Topics•String and Two Pointers Operations
hard Solve
62
Longest Unique Substring
Stack
medium Solve
63
Subarray Maximum Sum Within Specified Range
Arrays•Mixed
medium Solve
64
Unique Identifier Counter
Arrays
medium Solve
65
Identical File Identifiers
Hashing•Mixed
medium Solve
66
Merge And Sort Segments
Arrays•New or Existing ID
medium Solve
67
Count Inversions in Merging
Two Pointers•Mixed
medium Solve
68
Rectangular Block Rotation
Introduction to Arrays•Mixed
medium Solve
69
Filtered Array Indices
Arrays•TOOL RETURNED ID
medium Solve
70
Array Element Uniqueness Checker
Arrays
medium Solve
71
Identify Unique Identifier
Arrays
medium Solve
72
Binary Tree Maximum Depth Calculation
Stack
medium Solve
73
Rearrange Integer Array
Stack
easy Solve
74
Array Transformation Under Cyclic Shifts
Arrays•cyclicity and pattern recognition
medium Solve
75
Validate Crate Sequences
Stack•Mixed
medium Solve
76
Minimum Adjacent Swaps
Strings•Mixed
medium Solve
77
Longest Alternating Sequences
Arrays•Mixed
medium Solve
78
Min Length Alternating Subarray
Arrays•Sliding Window
medium Solve
79
Alternate Tree Fruiting
Arrays•pattern recognition, prefix sum
medium Solve
80
Peak Element in Rotated Array
Arrays•Modified Binary Search
medium Solve
81
Consecutive Resource Allocation
Arrays•Sliding Window
medium Solve
82
Array Rotation Alignment
Arrays•pattern recognition and rotation
medium Solve
83
Valid Crate Stacking
Stack•Mixed
medium Solve
84
Near-Equal Container Packing
Backtracking•Mixed
medium Solve
85
Reconstruct Alternating Sequence
Arrays•Mixed
medium Solve
86
Equal Payload Partition
Recursion•Mixed
medium Solve
87
Circular Array Subset Sum
Arrays•Two Pointers
medium Solve
88
Maximum Subarray Product
Arrays•basic-concepts
medium Solve
89
Optimal Array Partition
Two Pointers•Mixed
medium Solve
90
Minimum Component Subset
Two Pointers•Mixed
medium Solve
91
Container Distribution Count
Recursion•Mixed
medium Solve
92
Valid Subsequence Verification
Stack•Mixed
medium Solve
93
Consecutive Author Constraint
Strings•Mixed
medium Solve
94
Peak Index in Array
Arrays•Finding the maximum/minimum index with specific conditions
medium Solve
95
Alternating Sequence Length
Arrays•Identifying patterns in arrays
medium Solve
96
Maximum Alternating Sum
Arrays•prefix sum and greedy
medium Solve
97
Wormhole Route Combinations
Recursion•Mixed
medium Solve
98
Valid Coordinate Pairs
Stack•matching parentheses
medium Solve
99
String Code Replacement
Strings•Mixed
medium Solve
100
Longest Lexical Chain
Strings•Mixed
medium Solve
101
Count Unique Jumps
Recursion•Mixed
medium Solve
102
Combinatorial Weight Distribution
Recursion•Mixed
medium Solve
103
Balanced Hyperjump Sequences
Recursion•Mixed
medium Solve
104
Valid Nested Tags
Stack•Pattern recognition and application of stack data structure for parsing
medium Solve
105
Cyclic Character Sequence Validator
Strings•Mixed
medium Solve
106
Cargo Stack Operations
Stack•Mixed
medium Solve
107
Bracket Sequence Validator
Stack•Implementing a Stack to Validate Sequences
medium Solve
108
Peak Signals in Modified Array
Arrays•Array manipulation and peak element identification
medium Solve
109
Alternate Price Variations
Arrays•Observation and Iteration
medium Solve
110
Find Ascending Order Disruption Point
Arrays•Modified Binary Search
medium Solve
111
Alternate Ingredient Sequence Length
Strings•Mixed
medium Solve
112
Alternating Signal Sequences
Strings•Mixed
medium Solve
113
Alternating Character Substrings
Strings•Mixed
medium Solve
114
Combination Sum with Restrictions
Backtracking•Mixed
medium Solve
115
Longest Chained Subsequence
Strings•Mixed
medium Solve
116
Peak Asteroid Index
Arrays•binary search
medium Solve
117
Peak Index Locator
Arrays•Modified Binary Search
medium Solve
118
Partition Array by Weight
Arrays•Two Pointers
medium Solve
119
Alternating Sum Maximization
Arrays•Mixed
medium Solve
120
Longest Consecutive Temperature Trend
Arrays•Mixed
medium Solve
121
Even Odd Sum Equilibrium
Arrays•Prefix sum and observation
medium Solve
122
Bounded Subarray Length
Arrays•Sliding Window
medium Solve
123
Peak Element Index
Arrays•Modified binary search
medium Solve
124
Interleaved Recursive Sequences
Recursion•Mixed
medium Solve
125
Consecutive Subsequence Validator
Arrays•Linear Scan
medium Solve
126
Balanced Subarray Length
Arrays•Merge Sort / Quick Sort
medium Solve
127
Subarray Fuel Capacity Matches
Arrays•Pattern recognition and subarray formation
medium Solve
128
Optimal Weight Partition
Two Pointers•Mixed
medium Solve
129
Lexicographical Phrase Reconstructor
Strings•Mixed
medium Solve
130
Peak Temperature Indices
Arrays•Array traversal and pattern recognition
medium Solve
131
Peak Energy Indices
Arrays•Sliding Window
medium Solve
132
Peak Element Index
Arrays•Modified Binary Search
medium Solve
133
Alphanumeric Palindrome Validation
Stack
medium Solve
134
Alternating Sum Subarray Maximum
Arrays•Alternating sum subarray
medium Solve
135
Maximum Alternating Profit
Arrays•prefix sum and sign tracking
medium Solve
136
Alternating Sum Maximization
Arrays•Alternating sum subarray
medium Solve
137
Optimal Single Transaction Gain
Arrays•Kadane's / Prefix Sum
medium Solve
138
Consecutive Nucleotide Count
Strings•Mixed
medium Solve
139
Consecutive Character Blocks
Strings•Mixed
medium Solve
140
Longest Prefix Chain Length
Strings•Mixed
medium Solve
141
Consecutive Character Encoder
Strings•Mixed
medium Solve
142
Maximum Trade Value Optimization
Arrays•Mixed
medium Solve
143
Cyclic Array Maximization
Arrays•Prefix Sum and Cycle Detection
medium Solve
144
Longest Distinct Circular Subsequence
Arrays•longest-substring-without-repeating-characters
medium Solve
145
Balanced Package Sequence
Two Pointers•Mixed
medium Solve
146
Unique Grid Paths
Backtracking•Mixed
medium Solve
147
Subsequence Sum Threshold
Arrays•Mixed
medium Solve
148
Two Number Indices
Stack
medium Solve
149
Alternating Budget Accumulation
Arrays•prefix sum modification
medium Solve
150
Priority Crate Management
Arrays•Stack LIFO
medium Solve
151
Longest Constrained Subsequence
Arrays•Sliding Window
medium Solve
152
Alternating Subarray Sum
Arrays•max-subarray-sum
medium Solve
153
Min Length Bimodal Subsequence
Two Pointers•Mixed
medium Solve
154
Balanced Partitioning
Two Pointers•Mixed
medium Solve
155
Local Maxima Indices
Arrays•Pattern recognition and iteration
medium Solve
156
Max Height Calculation
Recursion•Mixed
medium Solve
157
Boundary Length Calculator
Recursion•Mixed
medium Solve
158
Minimized Rotation String
Arrays•String Manipulation
medium Solve
159
Duplicate Coordinate Pairs
Arrays•HashMap / HashSet
medium Solve
160
Character Frequency Sorting
Strings•Mixed
medium Solve
161
Valid Grid Paths
Backtracking•Mixed
medium Solve
162
Ingredient Quantity Parser
Strings•Mixed
medium Solve
163
Alternating Subsequence Sum
Arrays•Mixed
medium Solve
164
Maximal Stock Return
Arrays•General
medium Solve
165
Vowel Shift Cipher
Strings•Mixed
medium Solve
166
Cyclic Message Rotation
Arrays•String Manipulation
medium Solve
167
Alternating Sequence Length
Strings•Mixed
medium Solve
168
Validate Nested Parentheses
Stack•Mixed
medium Solve
169
Maximum Prefix Subarray Sum
Arrays•Kadane's / Prefix Sum
medium Solve
170
Merge Unsorted Temperature Readings
Arrays•Merge Sort / Quick Sort
medium Solve
171
Weight Category Partition
Arrays•Two Pointers
medium Solve
172
Optimal Product Selection
Arrays•General
medium Solve
173
Top Scoring Entities
Arrays•General
medium Solve
174
Substring Pattern Frequency
Strings•Mixed
medium Solve
175
Maximum Alternate Chest Sum
Arrays•Mixed
medium Solve
176
Count Balanced Strings
Strings•Mixed
medium Solve
177
Identify Local Maxima
Arrays•Pattern recognition and iteration
medium Solve
178
Validate Nested Signal Pairs
Stack•Mixed
medium Solve
179
Target Sum Pairs
Arrays•Two Pointers
medium Solve
180
Array Element Repeater
Arrays•Sequential
easy Solve
181
Longest Substring with K Unique Characters
Strings•Sliding Window
medium Solve
182
Minimum Edits for Palindromic Substrings
Strings•Mixed
hard Solve
183
Maximum Profit from Scheduled Deliveries
Dynamic Programming•Mixed
medium Solve
184
Balanced Subarray Extraction
Two Pointers•Two Pointers
medium Solve
185
Galaxy Signal Decoding
Hashing•Hashing
medium Solve
186
Longest Alternating Subsequence
Dynamic Programming•Mixed
medium Solve
187
Galactic Cargo Comparison
Two Pointers•Comparative
medium Solve
188
Character Frequency Counter
Strings•Frequency Map
easy Solve
189
Warehouse Inventory Validation
Stack•Mixed
medium Solve
190
Equilibrium Peak Finder
Arrays•Iterative
medium Solve
191
Minimum Window Substring with Two Pointers
Two Pointers•Two Pointer Pattern
medium Solve
192
Recursive String Partitioning
Strings•Recursive
medium Solve
193
Fascinating Frequency String
Strings•Frequency Map
easy Solve
194
Intergalactic Transmission
Strings•Mixed
medium Solve
195
Evaluating Postfix Expressions Using Stack
Stack•Stack Processing
medium Solve
196
Energy Grid Load Distribution
Arrays•Difference Array
medium Solve
197
Balanced Subarray Partitioning
Arrays•Prefix Sum
easy Solve
198
Evaluating Postfix Expressions Using a Stack
Stack•LIFO
medium Solve
199
Galactic Transmission Decoding
Strings•Fast/Slow Pointers
medium Solve
200
Interstellar Message Repair
Strings•Mixed
medium Solve
201
Maximal Visible Bridge Cost
Stack•Monotonic Stack
medium Solve
202
Peak Elevation Sequence
Arrays•Linear Scan
easy Solve
203
Pairwise Sum Equality
Two Pointers•Two Pointers
easy Solve
204
Pair Sum Balance
Arrays•Two Pointers
medium Solve
205
String Character Matcher
Strings•Basic List Operations
easy Solve
206
Longest Subarray with Proportional Sum
Arrays•Prefix Sums & Monotonic Stack
medium Solve
207
Even-Odd Boundary Pairs
Arrays•Two Pointers
easy Solve
208
String Reconstruction from Character Counts
Strings•Mixed
medium Solve
209
Element Count Threshold
Arrays•Basic Array Operations
easy Solve
210
Optimizing Space Station Oxygen Levels
Arrays•Dynamic
hard Solve
211
Chef's Ingredient Rearrangement
Strings•Random
medium Solve
212
String Reversal Check
Strings•Basic String Operations
easy Solve
213
String Reconfiguration
Strings•Mixed Topics
medium Solve
214
Detecting Cyclic Substring
Strings•Fast & Slow Pointers
medium Solve
215
Count Decaying Pairs
Arrays•Divide and Conquer
medium Solve
216
Longest Uniform Subarray
Arrays•subarray
medium Solve
217
Subarray Rotation Checker
Arrays•Fundamentals
medium Solve
218
Galactic Trade Imbalance
Arrays•Custom
medium Solve
219
Optimizing Space Station Supplies
Arrays•Custom
hard Solve
220
Identifying Pattern Substrings
Strings•Fundamentals
medium Solve
221
Equilibrium Balancing Index
Arrays•Prefix Sum
medium Solve
222
Maximum Weight K-Balanced Substring
Strings•Prefix Sums and Hash Map
medium Solve
223
Longest Substring with Limited Frequency Diversity
Strings•Sliding Window
medium Solve
224
Symmetric Parity Partition
Arrays•Two Pointers
easy Solve
225
Vowel-Restricted Identical Border Substring
Strings•Sliding Window
medium Solve
226
Shortest Substring of Dominant Characters
Strings•Hash Maps
medium Solve
227
Closest Difference Pair
Two Pointers•Two Pointer Search (Same Direction)
medium Solve
228
Matching Extremes
Strings•Pointer Manipulation
easy Solve
229
Symmetry Score of a String
Strings•Two Pointers
easy Solve
230
Balanced Subsegment Partitioning
Arrays•Prefix Sum
easy Solve
231
Peak Elevation Divergence
Arrays•Linear Scan
easy Solve
232
First Odd Frequency Character
Strings•Frequency Hash
easy Solve
233
Parity-Based Pointer Convergence
Two Pointers•Opposite Pointers
easy Solve
234
Shift Hash Characters
Strings•Slow/Fast Pointers
easy Solve
235
Crushing Heavy Boxes
Stack•LIFO
medium Solve
236
Verify Nickname Subsequence
Strings•Two Pointers
easy Solve
237
Daily Temperature Variations
Stack•Monotonic Stack
medium Solve
238
Interleaved String Reconstruction
Strings•Pointer Linkage
medium Solve
239
Optimizing Server Latency Pairs
Two Pointers•Two Pointers
medium Solve
240
Find the Average Presence
Arrays
easy Solve
241
Range Sum Query Using Prefix Sum
Arrays•Prefix Sum
easy Solve
242
Maximize Price Difference
Arrays•Basic Traversal
medium Solve
243
Maximum Triplet Oscillation
Arrays•Basic Traversal
medium Solve
244
Max Absolute Difference of Partition Extremes
Arrays•Basic Traversal
medium Solve
245
Optimized Linear Displacement Metric
Arrays•Basic Traversal
medium Solve
246
Maximum Absolute Variance
Arrays•Basic Traversal
medium Solve
247
Maximum Subarray Sum with Single Element Doubling
Arrays•Kadane's Algorithm
medium Solve
248
Maximum Equal-Endpoint Subarray Sum
Arrays•Prefix Sum
medium Solve
249
Longest Bounded Subarray with One Exclusion
Arrays•Prefix Sum
medium Solve
250
Range Equilibrium Pivot
Arrays•Prefix Sum
medium Solve
251
Dominant Array Value
Arrays•Moore's Voting
easy Solve
252
Three-Way Pivot Partitioning
Arrays•Dutch National Flag
medium Solve
253
Range Constrained Subsegment
Arrays•Basic Traversal
medium Solve
254
Maximum Position-Adjusted Gain
Arrays•Basic Traversal
medium Solve
255
Magnitude Range Extent
Arrays•Basic Traversal
easy Solve
256
Maximum Length Balanced Parity Subarray
Arrays•Prefix Sum
medium Solve
257
Difference of Segment Extremes
Arrays•Basic Traversal
easy Solve
258
Array Amplitude
Arrays•Basic Traversal
easy Solve
259
Magnitude Spread Calculation
Arrays•Basic Traversal
easy Solve
260
Extreme Spread Calculation
Arrays•Basic Traversal
easy Solve
261
CombinedSizePairs
Arrays•Two Pointers
easy Solve
262
Distinct Pair Sum Checker
Hashing•Two Sum / Hash Set
easy Solve
263
AscendingIdentifierSort
Arrays•Sorting
easy Solve
264
Single Occurrence Identifier
Hashing•Bit Manipulation / Hashing
easy Solve
265
Matched Sequence Pairs
Arrays•Two Pointers
easy Solve
266
Move Zeros to End
Arrays•Two Pointers
easy Solve
267
Longest Common Amplitude Segment
Arrays•Two Pointers
easy Solve
268
Majority Element Identifier
Hashing•Boyer-Moore Voting
easy Solve
269
Find Target Element
Arrays•Linear Search
easy Solve
270
Count Unique Elements
Arrays•Hashing
easy Solve
271
Rearrangement Equivalence Checker
Strings•Frequency Map
easy Solve
272
Divide Equal Quantities
Arrays•Greedy
easy Solve
273
Cumulative Array Sum
Arrays•Prefix Sum
easy Solve
274
Count Unique Elements
Arrays•Hashing
easy Solve
275
Find Balance Index
Arrays•Prefix Sum
easy Solve
276
WeightedSumCalculation
Arrays•Math
easy Solve
277
Count Unique Cargo Shipments
Arrays•Hashing
easy Solve
278
Minimal Node Identification within a Cyclic Linked List
Linked List•Floyd's Cycle Detection
medium Solve
279
Terminal Node Detection in Circular Singly Linked Lists
Linked List•Floyd's Cycle Detection
medium Solve
280
Optimal Resource Allocation
Arrays•Dynamic Programming
medium Solve
281
Longest Consecutive Sequence
Hashing•Hash Set
medium Solve
282
Unique Ingredient Combinations
Arrays•Hashing
medium Solve
283
Anagram Cluster Formation
Hashing•Hash Map / Grouping
medium Solve
284
MatchingPairs
Arrays•Two Pointers
easy Solve
285
Subarray Sum Counter
Hashing•Prefix Sum + Hash Map
medium Solve
286
Sum of Pairs
Arrays•Math
easy Solve
287
Pairs With Sum 947
Arrays•Two Pointers
easy Solve
288
Max Cumulative Intervals
Arrays•Two Pointers
medium Solve
289
Sorted Squares
Arrays•Two Pointers
easy Solve
290
Distance Between Pairs
Arrays•Two Pointers
easy Solve
291
Detect Duplicate Packages
Hashing•Sliding Window / Hash Map
easy Solve
292
Unique Signal Frequencies
Arrays•Hashing
easy Solve
293
Count Unique Frequencies
Hashing•Frequency Map
easy Solve
294
Complementary Energy Pairs
Arrays•Two Pointers
easy Solve
295
Sort Integer Array
Arrays•Sorting
easy Solve
296
LongestCommonPrefixFinder
Strings•Two Pointers
easy Solve
297
Symbol Pattern Verification
Hashing•Hash Map / Bijection
easy Solve
298
Longest Common Prefix String
Strings•Two Pointers
easy Solve
299
Isomorphic String Mapping
Hashing•Hash Map / Bijection
easy Solve
300
String Hash Validator
Strings•Hashing
easy Solve
301
First Duplicate Node
Arrays•Linear Scan
easy Solve
302
Unique Identifier Counting
Strings•Hashing
easy Solve
303
Max Alternating Substring Length
Strings•Two Pointers
easy Solve
304
Max Crates Allocation
Arrays•Two Pointers
medium Solve
305
Find Missing Indices
Arrays•Cyclic Sort / Index Hashing
easy Solve
306
Longest Common Subarray
Arrays•Two Pointers
medium Solve
307
Duplicate Element Identification
Arrays•Cyclic Sort / Index Hashing
medium Solve
308
Tank Pair Allocation
Arrays•Two Pointers
easy Solve
309
Partition Even Odd
Arrays•Two Pointers
easy Solve
310
Find Pairs of Array Elements Summing to Target
Arrays•Two Pointers
easy Solve
311
Subsequence Matcher
Strings•Two Pointers
easy Solve
312
Pair Sum Problem
Arrays•Two Pointers
easy Solve
313
Common Element Frequencies
Hashing•Frequency Map
easy Solve
314
Unique Element Count
Arrays•Hashing
easy Solve
315
Maximum Tomes On Shelf
Arrays•Dynamic Programming
medium Solve
316
LongestCommonPrefixLength
Strings•Two Pointers
easy Solve
317
Three Way Array Partition
Sorting•Dutch National Flag
medium Solve
318
Verify Hashed Identifiers
Hashing•Hashing
medium Solve
319
Triple Sum Zero
Two Pointers•Two Pointers
medium Solve
320
Group Anagrams
Hashing•Hashing + Sorting
medium Solve
321
Max Contained Volume
Two Pointers•Two Pointers
medium Solve
322
Frequency Counter of String Patterns
Hashing•Hashing
medium Solve
323
Container Water Volume
Two Pointers•Two Pointers
hard Solve
324
Distinct Hash Sum Lane Assignment
Hashing•Hashing
easy Solve
325
Unique Integer Pairs
Hashing•Hashing
easy Solve
326
Maximum Resource Lifetime
Sliding Window•Sliding Window
easy Solve
327
Valid Palindromic Sequence
Two Pointers•Two Pointers
easy Solve
328
Maximum Subarray Sum
Sliding Window•Sliding Window
medium Solve
329
Segmented Array Rearrangement
Two Pointers•Three Pointers / Segregation
medium Solve
330
Average Number of Events in Time Window
Sliding Window•Sliding Window
medium Solve
331
Minimum Window Sum
Sliding Window•Sliding Window
medium Solve
332
Max Average Subarray
Sliding Window•Sliding Window
medium Solve
333
Minimum Window Sum
Sliding Window•Sliding Window
medium Solve
334
Maximum Concurrent Events
Stack•Stack
easy Solve
335
Longest Unique Segment
Sliding Window•Sliding Window / Hash Set
medium Solve
336
Max Stack Weight
Stack•Stack Design
medium Solve
337
Longest Homogeneous Segment
Sliding Window•Sliding Window / Frequency Map
medium Solve
338
Longest Decreasing Subsequence Length
Stack•Monotonic Stack
easy Solve
339
Maximum Average Subsequence
Sliding Window•Fixed Sliding Window
easy Solve
340
Next Greater Element Indices
Stack•Monotonic Stack
medium Solve
341
Validate Message Timestamps
Stack•Stack
easy Solve
342
Minimize Congestion Sequence
Stack•Stack
medium Solve
343
Substring Anagram Detection
Sliding Window•Sliding Window / Hash Map
medium Solve
344
Constrained Message Ordering
Stack•Stack
medium Solve
345
Anagram Index Finder
Sliding Window•Sliding Window / Hash Map
medium Solve
346
Valid Parentheses String
Stack•Stack
medium Solve
347
Array Product Exclusions
Arrays•Prefix Sum / Array Traversal
medium Solve
348
Next Smaller Element Indices
Stack•Monotonic Stack
medium Solve
349
Minimum Replacements for Non-Decreasing Order
Stack•Monotonic Stack
hard Solve
350
Implement Queue Data Structure
Queue•Design
easy Solve
351
Count Divisible Subarrays
Hashing•Prefix Sum + Hash Map
medium Solve
352
Process Task Scheduling
Queue•Design
easy Solve
353
Daily Temperature Threshold
Stack•Monotonic Stack
easy Solve
354
Sequential Brewing Schedule
Queue•Design
medium Solve
355
Daily Temperatures
Stack•Monotonic Stack
medium Solve
356
Document Processing Order
Queue•Queue
easy Solve
357
Shortest Path in Unweighted Graph
Design•Design
medium Solve
358
Validate Stack Sequence
Stack•Stack
easy Solve
359
Count Contiguous Subarrays Below Threshold
Two Pointers•Sliding Window
medium Solve
360
Count Unique String Hashes
Hashing•Hashing
medium Solve
361
Minimum Alarm Window
Sliding Window•Sliding Window / Hash Map
hard Solve
362
Longest Subarray With Sum Exceeding Threshold
Sliding Window•Sliding Window
medium Solve
363
Contiguous Score Range
Two Pointers•Sliding Window / Ordered Map
medium Solve
364
Hash Table Key Mapping
Hashing•Hashing
medium Solve
365
Max Increasing Subsequence Length
Stack•Monotonic Stack
medium Solve
366
Maximum Subarray Cumulative Levels
Sliding Window•Sliding Window
hard Solve
367
Randomized Set Operations
Hashing•Hash Map / Dynamic Array
medium Solve
368
String to Hash Index Mapping
Hashing•Hashing
medium Solve
369
Consecutive Maximum Values
Sliding Window•Sliding Window / Monotonic Deque
hard Solve
370
Sequence of Stack Operations
Stack•Stack Design
medium Solve
371
Validate Packet Shadows
Stack•Stack
medium Solve
372
Max Length Subarray with Bounded Range
Sliding Window•Monotonic Deque
hard Solve
373
Reverse Linked List
Linked List•Linked List Reversal
easy Solve
374
Middle Node of a Singly Linked List
Linked List•Slow & Fast Pointer
easy Solve
375
Merge Two Sorted Linked Lists
Linked List•Merge
easy Solve
376
Find First Node With Specific Offset
Linked List•Two Pointers
medium Solve
377
LinkedList Cycle Detection
Linked List•Slow & Fast Pointer
easy Solve
378
Sort Linked List by Timestamp
Linked List•Combined
easy Solve
379
Middle Node of Linked List
Linked List•Two Pointers
easy Solve
380
Insert Interval into Sorted Linked List
Linked List•Simulation
medium Solve
381
Keyword Book Retrieval System
Linked List•Hashing
medium Solve
382
Sortable Linked List
Linked List•Combined
medium Solve
383
Resource Allocation
Recursion•Recursion
easy Solve
384
ResourceAllocationCombinations
Recursion•Recursion
easy Solve
385
Binary Inverted-Reverse Left Shift
Recursion•Bit Manipulation
easy Solve
386
Maximum Path Sum in Binary Tree
Recursion•Divide & Conquer
medium Solve
387
Count Paths in Grid
Recursion•Recursion
easy Solve
388
Safe Grid Paths
Backtracking•Backtracking
medium Solve
389
Distinct Traffic Light Mode Sequences
Backtracking•Backtracking
medium Solve
390
Valid Permutations with Forbidden Adjacent Pairs
Backtracking•Backtracking
medium Solve
391
Distribute Items into Containers
Backtracking•Backtracking
medium Solve
392
Find All Paths with Bounded Sum
Backtracking•Backtracking
medium Solve
393
Count of Safe XOR Permutations
Backtracking•Subsets/Permutations
hard Solve
394
Count Nodes in Each Subtree
Trees•DFS
easy Solve
395
Reachable Roads Count
Trees•DFS
easy Solve
396
Count Tree Nodes
Trees•DFS
easy Solve
397
Tree Node Resource Sum
Trees•DFS
easy Solve
398
Subtree Node Count
Trees•DFS
easy Solve
399
Tree Level Order Traversal
Trees•BFS
medium Solve
400
Minimum Domination Set
Trees•BFS
medium Solve
401
Minimum Tree Traversal Path
Trees•BFS
medium Solve
402
Count Nodes in Subtree
Trees•DFS
easy Solve
403
Sum of Subtree Values
Trees•DFS
easy Solve
404
Reverse Linked List
Linked List•Linked List Reversal
easy Solve
405
LinkedList Cycle Detection II
Linked List•Slow & Fast Pointer
easy Solve
406
Unique Path Finder
Backtracking•Backtracking
medium Solve
407
Total Node Shipments
Trees•DFS
easy Solve
408
MinTreeTraversalTime
Trees•BFS
medium Solve
409
Binary Search Frequency Locator
Binary Search•Binary Search
easy Solve
410
Find First Occurrence in Sorted Array
Binary Search•Binary Search
easy Solve
411
Sorted Matrix Search
Binary Search•Binary Search
easy Solve
412
Find Element in Sorted Array
Binary Search•Binary Search
medium Solve
413
Find First Greater Element Index
Binary Search•Binary Search
easy Solve
414
Find Closest Element in Sorted Array
Binary Search•Binary Search
medium Solve
415
Binary Search in Sorted Array
Binary Search•Binary Search
medium Solve
416
Minimum Nodes for Coverage
Binary Search•Binary Search on Answer
medium Solve
417
Min Threshold Value
Binary Search•Binary Search on Answer
medium Solve
418
Index of Target Value
Binary Search•Binary Search
hard Solve
419
Count Reachable Nodes in Undirected Graph
Graphs•DFS/BFS
easy Solve
420
Minimum Edges to Reach Target
Graphs•DFS/BFS
medium Solve
421
Minimum Traversal Edges
Graphs•BFS/DFS
medium Solve
422
Minimum Path Sum in Grid
Graphs•BFS
medium Solve
423
Find Reachable Nodes from Multiple Sources
Graphs•DFS
medium Solve
424
Task Dependency Order
Graphs•Topological Sort
medium Solve
425
Connected Modules Count
Graphs•DFS
medium Solve
426
Node Depth Count
Graphs•DFS
medium Solve
427
Course Schedule Order
Graphs•Topological Sort
medium Solve
428
Minimum Time to Reach All Vertices
Graphs•BFS
medium Solve
429
Max Resource Allocation
Dynamic Programming•DP
easy Solve
430
Maximize Subset Points
Dynamic Programming•DP
medium Solve
431
Maximum Collectible Points in Grid with K Moves
Dynamic Programming•DP
easy Solve
432
Minimum Product Path in Grid
Dynamic Programming•DP
easy Solve
433
Minimum Cost Demand Fulfillment
Dynamic Programming•DP
medium Solve
434
Minimum Resource Fulfillment
Dynamic Programming•DP
medium Solve
435
Optimal Page Restoration Cost
Dynamic Programming•DP
medium Solve
436
Minimum Cost Circular Traversal with Refueling
Dynamic Programming•DP
medium Solve
437
Optimal Traffic Cycle Synchronization
Dynamic Programming•DP
medium Solve
438
Minimum Cost Item Distribution with Capacity
Dynamic Programming•DP
medium Solve
439
Maximize Satisfied Resource Requests
Greedy•Greedy
easy Solve
440
Minimum Bins for Sequentially Sorted Items
Greedy•Greedy
medium Solve
441
Maximum Elements Within Sum Constraint
Greedy•Greedy
medium Solve
442
Timed Cost Element Manager
Heap•Heap
medium Solve
443
Implement Max Priority Queue
Heap•Heap
hard Solve
444
Determine Unique Element Count
Arrays•Hashing
easy Solve
445
Validate Message Sequence
Stack•Stack
easy Solve
446
Reverse Linked List
Linked List•Linked List Reversal
easy Solve
447
Binary Search for Target Speed
Binary Search•Binary Search
easy Solve
448
Compute Single-Source Shortest Paths
Graphs•DFS/BFS
medium Solve
449
Minimize Cargo Transports
Mixed
medium Solve
450
Maximum Component Combinations
Mixed
medium Solve
451
Find Pair With Target Sum
Mixed
medium Solve
452
Sum to Target
Mixed
medium Solve
453
TargetWeightNodeRearrangement
Mixed
hard Solve