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Showing 20 of 401 questions
Remove Nth Node From End of List
Medium
Linked Lists
Two Pointers
Two Pointers
★
Fast & Slow Pointers
LeetCode #19
Reorder List
Medium
Linked Lists
Two Pointers
Fast & Slow Pointers
★
LinkedList In-Place Reversal
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6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
LeetCode #143
Reorganize String
Medium
Hash Tables
Strings
Heap
Heap / Priority Queue
★
Greedy
LeetCode #767
Reverse Bits
Easy
Math
Two Pointers
★
LeetCode #190
Reverse Integer
Easy
Math
Greedy
★
LeetCode #7
Reverse Linked List II
Medium
Linked Lists
LinkedList In-Place Reversal
★
LeetCode #92
Reverse Linked List
Easy
Recursion
Linked Lists
LinkedList In-Place Reversal
★
LeetCode #206
Reverse String
Easy
Strings
Two Pointers
Two Pointers
★
LeetCode #344
Roman to Integer
Easy
Strings
Hash Tables
Math
Greedy
★
LeetCode #13
Rotate Array
Medium
Arrays
Two Pointers
Math
Two Pointers
★
LeetCode #189
Rotate Image
Medium
Math
Arrays
Matrix Manipulation
★
LeetCode #48
Rotting Oranges
Medium
Arrays
Graphs
BFS (Breadth-First Search)
★
Matrix Traversal
LeetCode #994
Same Tree
Easy
Trees
Recursion
DFS (Depth-First Search)
★
Binary Tree Traversal
LeetCode #100
Search a 2D Matrix
Medium
Arrays
Binary Search
Binary Search
★
Matrix Traversal
LeetCode #74
Search in Rotated Sorted Array II
Medium
Arrays
Binary Search
Binary Search
★
LeetCode #81
Search in Rotated Sorted Array
Medium
Arrays
Binary Search
Binary Search
★
LeetCode #33
Search Insert Position
Easy
Arrays
Binary Search
Binary Search
★
LeetCode #35
Serialize and Deserialize Binary Tree
Hard
Trees
Strings
BFS (Breadth-First Search)
★
DFS (Depth-First Search)
Binary Tree Traversal
LeetCode #297
Set Matrix Zeroes
Medium
Arrays
Hash Tables
Matrix Traversal
★
LeetCode #73
Simplify Path
Medium
Strings
Stack
Monotonic Stack
★
LeetCode #71