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Pattern 22: LeetCode Interview Patterns
Backtracking
Problemset
Discussion
AI Helper
Getting Started
0/5
1
Getting Started Overview
2
Who Is This For
3
How US Big Tech Interviews Work
4
The 18 Patterns
5
Section Recap
Hash Map Patterns
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1
What is Hash Map Patterns
2
Prerequisites
3
When to Use
4
When NOT to Use
5
Hash vs Array: When to Use Which
6
LeetCode 1 Two Sum - Problem Statement
7
Quiz: What Makes a Good Hash Map Key
8
LeetCode 1 Two Sum - Solution
9
LeetCode 1 Two Sum - Example and Complexity Analysis
10
LeetCode 1 Two Sum - Implementation
11
LeetCode 49 Group Anagrams - Problem Statement
12
LeetCode 49 Group Anagrams - Why Naive Fails
13
LeetCode 49 Group Anagrams - Solution
14
LeetCode 49 Group Anagrams - Example and Complexity Analysis
15
LeetCode 49 Group Anagrams - Implementation
16
LeetCode 128 Longest Consecutive Sequence - Problem Statement
17
Quiz: Identifying Sequence Starts
18
LeetCode 128 Longest Consecutive Sequence - Why Naive Fails
19
LeetCode 128 Longest Consecutive Sequence - Solution
20
LeetCode 128 Longest Consecutive Sequence - Example and Complexity Analysis
21
LeetCode 128 Longest Consecutive Sequence - Implementation
22
LeetCode 347 Top K Frequent Elements - Problem Statement
23
LeetCode 347 Top K Frequent Elements - Why Naive Fails
24
LeetCode 347 Top K Frequent Elements - Solution
25
LeetCode 347 Top K Frequent Elements - Example and Complexity Analysis
26
LeetCode 347 Top K Frequent Elements - Implementation
27
LeetCode 149 Max Points on Line - Problem Statement
28
LeetCode 149 Max Points on Line - Why Naive Fails
29
LeetCode 149 Max Points on Line - Solution
30
LeetCode 149 Max Points on Line - Example and Complexity Analysis
31
LeetCode 149 Max Points on Line - Implementation
32
Common Mistakes
33
Section Recap
Two Pointers
0/31
1
What is Two Pointers
2
Prerequisites
3
When to Use
4
When NOT to Use
5
LeetCode 125 Valid Palindrome - Problem Statement
6
Quiz: Two-Pointer Palindrome Movement
7
LeetCode 125 Valid Palindrome - Solution
8
LeetCode 125 Valid Palindrome - Example and Complexity Analysis
9
LeetCode 125 Valid Palindrome - Implementation
10
LeetCode 15 3Sum - Problem Statement
11
LeetCode 15 3Sum - Why Naive Fails
12
LeetCode 15 3Sum - Solution
13
LeetCode 15 3Sum - Example and Complexity Analysis
14
LeetCode 15 3Sum - Implementation
15
LeetCode 11 Container With Most Water - Problem Statement
16
LeetCode 11 Container With Most Water - Why Naive Fails
17
LeetCode 11 Container With Most Water - Solution
18
Quiz: Moving the Shorter Pointer
19
LeetCode 11 Container With Most Water - Example and Complexity Analysis
20
LeetCode 11 Container With Most Water - Implementation
21
LeetCode 42 Trapping Rain Water - Problem Statement
22
LeetCode 42 Trapping Rain Water - Why Naive Fails
23
LeetCode 42 Trapping Rain Water - Solution
24
LeetCode 42 Trapping Rain Water - Example and Complexity Analysis
25
LeetCode 42 Trapping Rain Water - Implementation
26
LeetCode 16 3Sum Closest - Problem Statement
27
LeetCode 16 3Sum Closest - Solution
28
LeetCode 16 3Sum Closest - Example and Complexity Analysis
29
LeetCode 16 3Sum Closest - Implementation
30
Common Mistakes
31
Section Recap
Sliding Window
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1
What is Sliding Window
2
Prerequisites
3
When to Use
4
When NOT to Use
5
Fixed vs Variable Window
6
LeetCode 121 Best Time to Buy and Sell Stock - Problem Statement
7
LeetCode 121 Best Time to Buy and Sell Stock - Solution
8
LeetCode 121 Best Time to Buy and Sell Stock - Example and Complexity Analysis
9
LeetCode 121 Best Time to Buy and Sell Stock - Implementation
10
LeetCode 3 Longest Substring Without Repeating Characters - Problem Statement
11
Quiz: Choosing the Right Data Structure
12
LeetCode 3 Longest Substring Without Repeating Characters - Why Naive Fails
13
LeetCode 3 Longest Substring Without Repeating Characters - Solution
14
LeetCode 3 Longest Substring Without Repeating Characters - Example and Complexity Analysis
15
LeetCode 3 Longest Substring Without Repeating Characters - Implementation
16
LeetCode 424 Longest Repeating Character Replacement - Problem Statement
17
Quiz: Calculating Replacements Needed
18
LeetCode 424 Longest Repeating Character Replacement - Why Naive Fails
19
LeetCode 424 Longest Repeating Character Replacement - Solution
20
LeetCode 424 Longest Repeating Character Replacement - Example and Complexity Analysis
21
LeetCode 424 Longest Repeating Character Replacement - Implementation
22
LeetCode 76 Minimum Window Substring - Problem Statement
23
LeetCode 76 Minimum Window Substring - Why Naive Fails
24
LeetCode 76 Minimum Window Substring - Solution
25
LeetCode 76 Minimum Window Substring - Example and Complexity Analysis
26
LeetCode 76 Minimum Window Substring - Implementation
27
LeetCode 239 Sliding Window Maximum - Problem Statement
28
LeetCode 239 Sliding Window Maximum - Why Naive Fails
29
LeetCode 239 Sliding Window Maximum - Solution
30
LeetCode 239 Sliding Window Maximum - Example and Complexity Analysis
31
LeetCode 239 Sliding Window Maximum - Implementation
32
Common Mistakes
33
Section Recap
Prefix Sum
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1
What is Prefix Sum
2
Prerequisites
3
When to Use
4
When NOT to Use
5
LeetCode 1480 Running Sum of 1d Array - Problem Statement
6
LeetCode 1480 Running Sum of 1d Array - Solution
7
LeetCode 1480 Running Sum of 1d Array - Example and Complexity Analysis
8
LeetCode 1480 Running Sum of 1d Array - Implementation
9
LeetCode 560 Subarray Sum Equals K - Problem Statement
10
Quiz: Prefix Sum Relationship
11
LeetCode 560 Subarray Sum Equals K - Why Naive Fails
12
LeetCode 560 Subarray Sum Equals K - Solution
13
LeetCode 560 Subarray Sum Equals K - Example and Complexity Analysis
14
LeetCode 560 Subarray Sum Equals K - Implementation
15
LeetCode 238 Product of Array Except Self - Problem Statement
16
Quiz: Product Without Division
17
LeetCode 238 Product of Array Except Self - Why Naive Fails
18
LeetCode 238 Product of Array Except Self - Solution
19
LeetCode 238 Product of Array Except Self - Example and Complexity Analysis
20
LeetCode 238 Product of Array Except Self - Implementation
21
LeetCode 304 Range Sum Query 2D - Immutable - Problem Statement
22
LeetCode 304 Range Sum Query 2D - Immutable - Why Naive Fails
23
LeetCode 304 Range Sum Query 2D - Immutable - Solution
24
LeetCode 304 Range Sum Query 2D - Immutable - Example and Complexity Analysis
25
LeetCode 304 Range Sum Query 2D - Immutable - Implementation
26
LeetCode 523 Continuous Subarray Sum - Problem Statement
27
LeetCode 523 Continuous Subarray Sum - Why Naive Fails
28
LeetCode 523 Continuous Subarray Sum - Solution
29
LeetCode 523 Continuous Subarray Sum - Example and Complexity Analysis
30
LeetCode 523 Continuous Subarray Sum - Implementation
31
Common Mistakes
32
Section Recap
Binary Search
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1
What is Binary Search
2
Prerequisites
3
When to Use
4
When NOT to Use
5
Search Space Thinking
6
LeetCode 704 Binary Search - Problem Statement
7
LeetCode 704 Binary Search - Solution
8
LeetCode 704 Binary Search - Example and Complexity Analysis
9
LeetCode 704 Binary Search - Implementation
10
LeetCode 33 Search in Rotated Sorted Array - Problem Statement
11
Quiz: Rotated Array Property
12
LeetCode 33 Search in Rotated Sorted Array - Why Naive Fails
13
LeetCode 33 Search in Rotated Sorted Array - Solution
14
LeetCode 33 Search in Rotated Sorted Array - Example and Complexity Analysis
15
LeetCode 33 Search in Rotated Sorted Array - Implementation
16
LeetCode 34 Find First and Last Position of Element - Problem Statement
17
LeetCode 34 Find First and Last Position of Element - Why Naive Fails
18
LeetCode 34 Find First and Last Position of Element - Solution
19
LeetCode 34 Find First and Last Position of Element - Example and Complexity Analysis
20
LeetCode 34 Find First and Last Position of Element - Implementation
21
LeetCode 875 Koko Eating Bananas - Problem Statement
22
Quiz: Binary Search on Answer
23
LeetCode 875 Koko Eating Bananas - Why Naive Fails
24
LeetCode 875 Koko Eating Bananas - Solution
25
LeetCode 875 Koko Eating Bananas - Example and Complexity Analysis
26
LeetCode 875 Koko Eating Bananas - Implementation
27
LeetCode 4 Median of Two Sorted Arrays - Problem Statement
28
LeetCode 4 Median of Two Sorted Arrays - Why Naive Fails
29
LeetCode 4 Median of Two Sorted Arrays - Solution
30
LeetCode 4 Median of Two Sorted Arrays - Example and Complexity Analysis
31
LeetCode 4 Median of Two Sorted Arrays - Implementation
32
Common Mistakes
33
Section Recap
Linked List
0/29
1
What is Linked List
2
Prerequisites
3
When to Use
4
When NOT to Use
5
LeetCode 206 Reverse Linked List - Problem Statement
6
LeetCode 206 Reverse Linked List - Solution
7
LeetCode 206 Reverse Linked List - Example and Complexity Analysis
8
LeetCode 206 Reverse Linked List - Implementation
9
LeetCode 141 Linked List Cycle - Problem Statement
10
Quiz: Cycle Detection Technique
11
LeetCode 141 Linked List Cycle - Solution
12
LeetCode 141 Linked List Cycle - Example and Complexity Analysis
13
LeetCode 141 Linked List Cycle - Implementation
14
LeetCode 19 Remove Nth Node From End - Problem Statement
15
Quiz: Finding Nth From End
16
LeetCode 19 Remove Nth Node From End - Solution
17
LeetCode 19 Remove Nth Node From End - Example and Complexity Analysis
18
LeetCode 19 Remove Nth Node From End - Implementation
19
LeetCode 143 Reorder List - Problem Statement
20
LeetCode 143 Reorder List - Solution
21
LeetCode 143 Reorder List - Example and Complexity Analysis
22
LeetCode 143 Reorder List - Implementation
23
LeetCode 23 Merge K Sorted Lists - Problem Statement
24
LeetCode 23 Merge K Sorted Lists - Why Naive Fails
25
LeetCode 23 Merge K Sorted Lists - Solution
26
LeetCode 23 Merge K Sorted Lists - Example and Complexity Analysis
27
LeetCode 23 Merge K Sorted Lists - Implementation
28
Common Mistakes
29
Section Recap
Stack Patterns
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1
What is Stack Patterns
2
Prerequisites
3
When to Use
4
When NOT to Use
5
LeetCode 20 Valid Parentheses - Problem Statement
6
LeetCode 20 Valid Parentheses - Solution
7
LeetCode 20 Valid Parentheses - Example and Complexity Analysis
8
LeetCode 20 Valid Parentheses - Implementation
9
LeetCode 155 Min Stack - Problem Statement
10
Quiz: Tracking Minimum in O(1)
11
LeetCode 155 Min Stack - Why Naive Fails
12
LeetCode 155 Min Stack - Solution
13
LeetCode 155 Min Stack - Example and Complexity Analysis
14
LeetCode 155 Min Stack - Implementation
15
LeetCode 150 Evaluate Reverse Polish Notation - Problem Statement
16
LeetCode 150 Evaluate Reverse Polish Notation - Solution
17
LeetCode 150 Evaluate Reverse Polish Notation - Example and Complexity Analysis
18
LeetCode 150 Evaluate Reverse Polish Notation - Implementation
19
LeetCode 394 Decode String - Problem Statement
20
Quiz: Handling Nested Brackets
21
LeetCode 394 Decode String - Why Naive Fails
22
LeetCode 394 Decode String - Solution
23
LeetCode 394 Decode String - Example and Complexity Analysis
24
LeetCode 394 Decode String - Implementation
25
LeetCode 227 Basic Calculator II - Problem Statement
26
LeetCode 227 Basic Calculator II - Why Naive Fails
27
LeetCode 227 Basic Calculator II - Solution
28
LeetCode 227 Basic Calculator II - Example and Complexity Analysis
29
LeetCode 227 Basic Calculator II - Implementation
30
Common Mistakes
31
Section Recap
Monotonic Stack
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1
What is Monotonic Stack
2
Prerequisites
3
When to Use
4
When NOT to Use
5
LeetCode 496 Next Greater Element I - Problem Statement
6
LeetCode 496 Next Greater Element I - Solution
7
LeetCode 496 Next Greater Element I - Example and Complexity Analysis
8
LeetCode 496 Next Greater Element I - Implementation
9
LeetCode 739 Daily Temperatures - Problem Statement
10
Quiz: Monotonic Stack Property
11
LeetCode 739 Daily Temperatures - Why Naive Fails
12
LeetCode 739 Daily Temperatures - Solution
13
LeetCode 739 Daily Temperatures - Example and Complexity Analysis
14
LeetCode 739 Daily Temperatures - Implementation
15
LeetCode 503 Next Greater Element II - Problem Statement
16
LeetCode 503 Next Greater Element II - Why Naive Fails
17
LeetCode 503 Next Greater Element II - Solution
18
LeetCode 503 Next Greater Element II - Example and Complexity Analysis
19
LeetCode 503 Next Greater Element II - Implementation
20
LeetCode 907 Sum of Subarray Minimums - Problem Statement
21
LeetCode 907 Sum of Subarray Minimums - Why Naive Fails
22
LeetCode 907 Sum of Subarray Minimums - Solution
23
LeetCode 907 Sum of Subarray Minimums - Example and Complexity Analysis
24
LeetCode 907 Sum of Subarray Minimums - Implementation
25
LeetCode 84 Largest Rectangle in Histogram - Problem Statement
26
Quiz: Rectangle Extension
27
LeetCode 84 Largest Rectangle in Histogram - Why Naive Fails
28
LeetCode 84 Largest Rectangle in Histogram - Solution
29
LeetCode 84 Largest Rectangle in Histogram - Example and Complexity Analysis
30
LeetCode 84 Largest Rectangle in Histogram - Implementation
31
Common Mistakes
32
Section Recap
Heap / Priority Queue
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1
What is Heap / Priority Queue
2
Prerequisites
3
When to Use
4
When NOT to Use
5
LeetCode 703 Kth Largest Element in a Stream - Problem Statement
6
LeetCode 703 Kth Largest Element in a Stream - Solution
7
LeetCode 703 Kth Largest Element in a Stream - Example and Complexity Analysis
8
LeetCode 703 Kth Largest Element in a Stream - Implementation
9
LeetCode 215 Kth Largest Element in an Array - Problem Statement
10
Quiz: Heap for Kth Largest
11
LeetCode 215 Kth Largest Element in an Array - Why Naive Fails
12
LeetCode 215 Kth Largest Element in an Array - Solution
13
LeetCode 215 Kth Largest Element in an Array - Example and Complexity Analysis
14
LeetCode 215 Kth Largest Element in an Array - Implementation
15
LeetCode 973 K Closest Points to Origin - Problem Statement
16
LeetCode 973 K Closest Points to Origin - Why Naive Fails
17
LeetCode 973 K Closest Points to Origin - Solution
18
LeetCode 973 K Closest Points to Origin - Example and Complexity Analysis
19
LeetCode 973 K Closest Points to Origin - Implementation
20
LeetCode 621 Task Scheduler - Problem Statement
21
LeetCode 621 Task Scheduler - Why Naive Fails
22
LeetCode 621 Task Scheduler - Solution
23
LeetCode 621 Task Scheduler - Example and Complexity Analysis
24
LeetCode 621 Task Scheduler - Implementation
25
LeetCode 295 Find Median from Data Stream - Problem Statement
26
Quiz: Streaming Median
27
LeetCode 295 Find Median from Data Stream - Why Naive Fails
28
LeetCode 295 Find Median from Data Stream - Solution
29
LeetCode 295 Find Median from Data Stream - Example and Complexity Analysis
30
LeetCode 295 Find Median from Data Stream - Implementation
31
Common Mistakes
32
Section Recap
Trees
0/31
1
What is Trees
2
Prerequisites
3
When to Use
4
When NOT to Use
5
LeetCode 226 Invert Binary Tree - Problem Statement
6
LeetCode 226 Invert Binary Tree - Solution
7
LeetCode 226 Invert Binary Tree - Example and Complexity Analysis
8
LeetCode 226 Invert Binary Tree - Implementation
9
LeetCode 98 Validate Binary Search Tree - Problem Statement
10
Quiz: BST Validation Pitfall
11
LeetCode 98 Validate Binary Search Tree - Why Naive Fails
12
LeetCode 98 Validate Binary Search Tree - Solution
13
LeetCode 98 Validate Binary Search Tree - Example and Complexity Analysis
14
LeetCode 98 Validate Binary Search Tree - Implementation
15
LeetCode 235 Lowest Common Ancestor of BST - Problem Statement
16
Quiz: LCA in BST
17
LeetCode 235 Lowest Common Ancestor of BST - Solution
18
LeetCode 235 Lowest Common Ancestor of BST - Example and Complexity Analysis
19
LeetCode 235 Lowest Common Ancestor of BST - Implementation
20
LeetCode 124 Binary Tree Maximum Path Sum - Problem Statement
21
LeetCode 124 Binary Tree Maximum Path Sum - Why Naive Fails
22
LeetCode 124 Binary Tree Maximum Path Sum - Solution
23
LeetCode 124 Binary Tree Maximum Path Sum - Example and Complexity Analysis
24
LeetCode 124 Binary Tree Maximum Path Sum - Implementation
25
LeetCode 297 Serialize and Deserialize Binary Tree - Problem Statement
26
LeetCode 297 Serialize and Deserialize Binary Tree - Why Naive Fails
27
LeetCode 297 Serialize and Deserialize Binary Tree - Solution
28
LeetCode 297 Serialize and Deserialize Binary Tree - Example and Complexity Analysis
29
LeetCode 297 Serialize and Deserialize Binary Tree - Implementation
30
Common Mistakes
31
Section Recap
Trie
0/32
1
What is Trie
2
Prerequisites
3
When to Use
4
When NOT to Use
5
LeetCode 208 Implement Trie - Problem Statement
6
Quiz: Trie Search vs StartsWith
7
LeetCode 208 Implement Trie - Solution
8
LeetCode 208 Implement Trie - Example and Complexity Analysis
9
LeetCode 208 Implement Trie - Implementation
10
LeetCode 211 Design Add and Search Words - Problem Statement
11
Quiz: Wildcard Search
12
LeetCode 211 Design Add and Search Words - Why Naive Fails
13
LeetCode 211 Design Add and Search Words - Solution
14
LeetCode 211 Design Add and Search Words - Example and Complexity Analysis
15
LeetCode 211 Design Add and Search Words - Implementation
16
LeetCode 648 Replace Words - Problem Statement
17
LeetCode 648 Replace Words - Why Naive Fails
18
LeetCode 648 Replace Words - Solution
19
LeetCode 648 Replace Words - Example and Complexity Analysis
20
LeetCode 648 Replace Words - Implementation
21
LeetCode 1268 Search Suggestions System - Problem Statement
22
LeetCode 1268 Search Suggestions System - Why Naive Fails
23
LeetCode 1268 Search Suggestions System - Solution
24
LeetCode 1268 Search Suggestions System - Example and Complexity Analysis
25
LeetCode 1268 Search Suggestions System - Implementation
26
LeetCode 212 Word Search II - Problem Statement
27
LeetCode 212 Word Search II - Why Naive Fails
28
LeetCode 212 Word Search II - Solution
29
LeetCode 212 Word Search II - Example and Complexity Analysis
30
LeetCode 212 Word Search II - Implementation
31
Common Mistakes
32
Section Recap
Backtracking
0/34
1
What is Backtracking
2
Prerequisites
3
When to Use
4
When NOT to Use
5
LeetCode 784 Letter Case Permutation - Problem Statement
6
LeetCode 784 Letter Case Permutation - Solution
7
LeetCode 784 Letter Case Permutation - Example and Complexity Analysis
8
LeetCode 784 Letter Case Permutation - Implementation
9
LeetCode 46 Permutations - Problem Statement
10
Quiz: Backtracking Essentials
11
LeetCode 46 Permutations - Why Naive Fails
12
LeetCode 46 Permutations - Solution
13
LeetCode 46 Permutations - Example and Complexity Analysis
14
LeetCode 46 Permutations - Implementation
15
LeetCode 78 Subsets - Problem Statement
16
LeetCode 78 Subsets - Solution
17
LeetCode 78 Subsets - Example and Complexity Analysis
18
LeetCode 78 Subsets - Implementation
19
LeetCode 39 Combination Sum - Problem Statement
20
LeetCode 39 Combination Sum - Why Naive Fails
21
LeetCode 39 Combination Sum - Solution
22
LeetCode 39 Combination Sum - Example and Complexity Analysis
23
LeetCode 39 Combination Sum - Implementation
24
LeetCode 51 N-Queens - Problem Statement
25
Quiz: N-Queens Constraints
26
LeetCode 51 N-Queens - Why Naive Fails
27
LeetCode 51 N-Queens - Solution
28
LeetCode 51 N-Queens - Example and Complexity Analysis
29
LeetCode 51 N-Queens - Implementation
30
LeetCode 212 Word Search II - Problem Statement
31
LeetCode 212 Word Search II - Solution
32
LeetCode 212 Word Search II - Implementation
33
Common Mistakes
34
Section Recap
Graphs - BFS
0/32
1
What is Graphs - BFS
2
Prerequisites
3
When to Use
4
When NOT to Use
5
LeetCode 200 Number of Islands - Problem Statement
6
LeetCode 200 Number of Islands - Solution
7
LeetCode 200 Number of Islands - Example and Complexity Analysis
8
LeetCode 200 Number of Islands - Implementation
9
LeetCode 752 Open the Lock - Problem Statement
10
LeetCode 752 Open the Lock - Why Naive Fails
11
LeetCode 752 Open the Lock - Solution
12
LeetCode 752 Open the Lock - Example and Complexity Analysis
13
LeetCode 752 Open the Lock - Implementation
14
LeetCode 994 Rotting Oranges - Problem Statement
15
Quiz: Multi-Source BFS
16
LeetCode 994 Rotting Oranges - Why Naive Fails
17
LeetCode 994 Rotting Oranges - Solution
18
LeetCode 994 Rotting Oranges - Example and Complexity Analysis
19
LeetCode 994 Rotting Oranges - Implementation
20
LeetCode 1091 Shortest Path in Binary Matrix - Problem Statement
21
LeetCode 1091 Shortest Path in Binary Matrix - Why Naive Fails
22
LeetCode 1091 Shortest Path in Binary Matrix - Solution
23
LeetCode 1091 Shortest Path in Binary Matrix - Example and Complexity Analysis
24
LeetCode 1091 Shortest Path in Binary Matrix - Implementation
25
LeetCode 127 Word Ladder - Problem Statement
26
Quiz: BFS for Shortest Path
27
LeetCode 127 Word Ladder - Why Naive Fails
28
LeetCode 127 Word Ladder - Solution
29
LeetCode 127 Word Ladder - Example and Complexity Analysis
30
LeetCode 127 Word Ladder - Implementation
31
Common Mistakes
32
Section Recap
Graphs - DFS
0/36
1
What is Graphs - DFS
2
Prerequisites
3
When to Use
4
When NOT to Use
5
LeetCode 733 Flood Fill - Problem Statement
6
LeetCode 733 Flood Fill - Solution
7
LeetCode 733 Flood Fill - Example and Complexity Analysis
8
LeetCode 733 Flood Fill - Implementation
9
LeetCode 261 Graph Valid Tree - Problem Statement
10
Quiz: Valid Tree Conditions
11
LeetCode 261 Graph Valid Tree - Why Naive Fails
12
LeetCode 261 Graph Valid Tree - Solution
13
LeetCode 261 Graph Valid Tree - Example and Complexity Analysis
14
LeetCode 261 Graph Valid Tree - Implementation
15
LeetCode 417 Pacific Atlantic Water Flow - Problem Statement
16
LeetCode 417 Pacific Atlantic Water Flow - Why Naive Fails
17
LeetCode 417 Pacific Atlantic Water Flow - Solution
18
LeetCode 417 Pacific Atlantic Water Flow - Example and Complexity Analysis
19
LeetCode 417 Pacific Atlantic Water Flow - Implementation
20
LeetCode 695 Max Area of Island - Problem Statement
21
LeetCode 695 Max Area of Island - Solution
22
LeetCode 695 Max Area of Island - Example and Complexity Analysis
23
LeetCode 695 Max Area of Island - Implementation
24
LeetCode 130 Surrounded Regions - Problem Statement
25
LeetCode 130 Surrounded Regions - Why Naive Fails
26
LeetCode 130 Surrounded Regions - Solution
27
LeetCode 130 Surrounded Regions - Example and Complexity Analysis
28
LeetCode 130 Surrounded Regions - Implementation
29
LeetCode 329 Longest Increasing Path in a Matrix - Problem Statement
30
Quiz: DFS with Memoization
31
LeetCode 329 Longest Increasing Path in a Matrix - Why Naive Fails
32
LeetCode 329 Longest Increasing Path in a Matrix - Solution
33
LeetCode 329 Longest Increasing Path in a Matrix - Example and Complexity Analysis
34
LeetCode 329 Longest Increasing Path in a Matrix - Implementation
35
Common Mistakes
36
Section Recap
Topological Sort
0/32
1
What is Topological Sort
2
Prerequisites
3
When to Use
4
When NOT to Use
5
LeetCode 207 Course Schedule - Problem Statement
6
Quiz: Cycle Detection
7
LeetCode 207 Course Schedule - Solution
8
LeetCode 207 Course Schedule - Example and Complexity Analysis
9
LeetCode 207 Course Schedule - Implementation
10
LeetCode 210 Course Schedule II - Problem Statement
11
LeetCode 210 Course Schedule II - Why Naive Fails
12
LeetCode 210 Course Schedule II - Solution
13
LeetCode 210 Course Schedule II - Example and Complexity Analysis
14
LeetCode 210 Course Schedule II - Implementation
15
LeetCode 1136 Parallel Courses - Problem Statement
16
LeetCode 1136 Parallel Courses - Why Naive Fails
17
LeetCode 1136 Parallel Courses - Solution
18
LeetCode 1136 Parallel Courses - Example and Complexity Analysis
19
LeetCode 1136 Parallel Courses - Implementation
20
LeetCode 269 Alien Dictionary - Problem Statement
21
Quiz: Building the Ordering Graph
22
LeetCode 269 Alien Dictionary - Why Naive Fails
23
LeetCode 269 Alien Dictionary - Solution
24
LeetCode 269 Alien Dictionary - Example and Complexity Analysis
25
LeetCode 269 Alien Dictionary - Implementation
26
LeetCode 1203 Sort Items by Groups Respecting Dependencies - Problem Statement
27
LeetCode 1203 Sort Items by Groups Respecting Dependencies - Why Naive Fails
28
LeetCode 1203 Sort Items by Groups Respecting Dependencies - Solution
29
LeetCode 1203 Sort Items by Groups Respecting Dependencies - Example and Complexity Analysis
30
LeetCode 1203 Sort Items by Groups Respecting Dependencies - Implementation
31
Common Mistakes
32
Section Recap
Union Find
0/40
1
What is Union Find
2
Prerequisites
3
When to Use
4
When NOT to Use
5
LeetCode 1971 Find if Path Exists - Problem Statement
6
LeetCode 1971 Find if Path Exists - Solution
7
LeetCode 1971 Find if Path Exists - Example and Complexity Analysis
8
LeetCode 1971 Find if Path Exists - Implementation
9
LeetCode 547 Number of Provinces - Problem Statement
10
Quiz: Counting Components
11
LeetCode 547 Number of Provinces - Solution
12
LeetCode 547 Number of Provinces - Example and Complexity Analysis
13
LeetCode 547 Number of Provinces - Implementation
14
LeetCode 721 Accounts Merge - Problem Statement
15
LeetCode 721 Accounts Merge - Why Naive Fails
16
LeetCode 721 Accounts Merge - Solution
17
LeetCode 721 Accounts Merge - Example and Complexity Analysis
18
LeetCode 721 Accounts Merge - Implementation
19
LeetCode 1319 Number of Operations to Make Network Connected - Problem Statement
20
LeetCode 1319 Number of Operations to Make Network Connected - Why Naive Fails
21
LeetCode 1319 Number of Operations to Make Network Connected - Solution
22
LeetCode 1319 Number of Operations to Make Network Connected - Example and Complexity Analysis
23
LeetCode 1319 Number of Operations to Make Network Connected - Implementation
24
LeetCode 684 Redundant Connection - Problem Statement
25
Quiz: Detecting Redundant Edge
26
LeetCode 684 Redundant Connection - Why Naive Fails
27
LeetCode 684 Redundant Connection - Solution
28
LeetCode 684 Redundant Connection - Example and Complexity Analysis
29
LeetCode 684 Redundant Connection - Implementation
30
LeetCode 778 Swim in Rising Water - Problem Statement
31
LeetCode 778 Swim in Rising Water - Solution
32
LeetCode 778 Swim in Rising Water - Example and Complexity Analysis
33
LeetCode 778 Swim in Rising Water - Implementation
34
LeetCode 947 Most Stones Removed with Same Row or Column - Problem Statement
35
LeetCode 947 Most Stones Removed with Same Row or Column - Why Naive Fails
36
LeetCode 947 Most Stones Removed with Same Row or Column - Solution
37
LeetCode 947 Most Stones Removed with Same Row or Column - Example and Complexity Analysis
38
LeetCode 947 Most Stones Removed with Same Row or Column - Implementation
39
Common Mistakes
40
Section Recap
Dynamic Programming - 1D
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1
What is Dynamic Programming - 1D
2
Prerequisites
3
When to Use
4
When NOT to Use
5
LeetCode 70 Climbing Stairs - Problem Statement
6
Quiz: Staircase Recurrence
7
LeetCode 70 Climbing Stairs - Solution
8
LeetCode 70 Climbing Stairs - Example and Complexity Analysis
9
LeetCode 70 Climbing Stairs - Implementation
10
LeetCode 139 Word Break - Problem Statement
11
LeetCode 139 Word Break - Why Naive Fails
12
LeetCode 139 Word Break - Solution
13
LeetCode 139 Word Break - Example and Complexity Analysis
14
LeetCode 139 Word Break - Implementation
15
LeetCode 198 House Robber - Problem Statement
16
Quiz: House Robber Decision
17
LeetCode 198 House Robber - Why Naive Fails
18
LeetCode 198 House Robber - Solution
19
LeetCode 198 House Robber - Example and Complexity Analysis
20
LeetCode 198 House Robber - Implementation
21
LeetCode 300 Longest Increasing Subsequence - Problem Statement
22
LeetCode 300 Longest Increasing Subsequence - Why Naive Fails
23
LeetCode 300 Longest Increasing Subsequence - Solution
24
LeetCode 300 Longest Increasing Subsequence - Example and Complexity Analysis
25
LeetCode 300 Longest Increasing Subsequence - Implementation
26
LeetCode 322 Coin Change - Problem Statement
27
LeetCode 322 Coin Change - Why Naive Fails
28
LeetCode 322 Coin Change - Solution
29
LeetCode 322 Coin Change - Example and Complexity Analysis
30
LeetCode 322 Coin Change - Implementation
31
LeetCode 140 Word Break II - Problem Statement
32
LeetCode 140 Word Break II - Solution
33
LeetCode 140 Word Break II - Example and Complexity Analysis
34
LeetCode 140 Word Break II - Implementation
35
Common Mistakes
36
Section Recap
Dynamic Programming - 2D
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1
What is Dynamic Programming - 2D
2
Prerequisites
3
When to Use
4
When NOT to Use
5
LeetCode 62 Unique Paths - Problem Statement
6
Quiz: Grid Paths Recurrence
7
LeetCode 62 Unique Paths - Solution
8
LeetCode 62 Unique Paths - Example and Complexity Analysis
9
LeetCode 62 Unique Paths - Implementation
10
LeetCode 97 Interleaving String - Problem Statement
11
LeetCode 97 Interleaving String - Why Naive Fails
12
LeetCode 97 Interleaving String - Solution
13
LeetCode 97 Interleaving String - Example and Complexity Analysis
14
LeetCode 97 Interleaving String - Implementation
15
LeetCode 1143 Longest Common Subsequence - Problem Statement
16
Quiz: LCS Recurrence
17
LeetCode 1143 Longest Common Subsequence - Why Naive Fails
18
LeetCode 1143 Longest Common Subsequence - Solution
19
LeetCode 1143 Longest Common Subsequence - Example and Complexity Analysis
20
LeetCode 1143 Longest Common Subsequence - Implementation
21
LeetCode 72 Edit Distance - Problem Statement
22
LeetCode 72 Edit Distance - Why Naive Fails
23
LeetCode 72 Edit Distance - Solution
24
LeetCode 72 Edit Distance - Example and Complexity Analysis
25
LeetCode 72 Edit Distance - Implementation
26
LeetCode 115 Distinct Subsequences - Problem Statement
27
LeetCode 115 Distinct Subsequences - Why Naive Fails
28
LeetCode 115 Distinct Subsequences - Solution
29
LeetCode 115 Distinct Subsequences - Example and Complexity Analysis
30
LeetCode 115 Distinct Subsequences - Implementation
31
Common Mistakes
32
Section Recap
Intervals
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1
What is Intervals
2
Prerequisites
3
When to Use
4
When NOT to Use
5
LeetCode 252 Meeting Rooms - Problem Statement
6
LeetCode 252 Meeting Rooms - Solution
7
LeetCode 252 Meeting Rooms - Example and Complexity Analysis
8
LeetCode 252 Meeting Rooms - Implementation
9
LeetCode 56 Merge Intervals - Problem Statement
10
Quiz: Merging Strategy
11
LeetCode 56 Merge Intervals - Why Naive Fails
12
LeetCode 56 Merge Intervals - Solution
13
LeetCode 56 Merge Intervals - Example and Complexity Analysis
14
LeetCode 56 Merge Intervals - Implementation
15
LeetCode 57 Insert Interval - Problem Statement
16
LeetCode 57 Insert Interval - Solution
17
LeetCode 57 Insert Interval - Example and Complexity Analysis
18
LeetCode 57 Insert Interval - Implementation
19
LeetCode 253 Meeting Rooms II - Problem Statement
20
Quiz: Counting Concurrent Meetings
21
LeetCode 253 Meeting Rooms II - Why Naive Fails
22
LeetCode 253 Meeting Rooms II - Solution
23
LeetCode 253 Meeting Rooms II - Example and Complexity Analysis
24
LeetCode 253 Meeting Rooms II - Implementation
25
LeetCode 435 Non-overlapping Intervals - Problem Statement
26
LeetCode 435 Non-overlapping Intervals - Why Naive Fails
27
LeetCode 435 Non-overlapping Intervals - Solution
28
LeetCode 435 Non-overlapping Intervals - Example and Complexity Analysis
29
LeetCode 435 Non-overlapping Intervals - Implementation
30
Common Mistakes
31
Section Recap
Greedy
0/40
1
What is Greedy
2
Prerequisites
3
When to Use
4
When NOT to Use
5
LeetCode 455 Assign Cookies - Problem Statement
6
LeetCode 455 Assign Cookies - Solution
7
LeetCode 455 Assign Cookies - Example and Complexity Analysis
8
LeetCode 455 Assign Cookies - Implementation
9
LeetCode 53 Maximum Subarray - Problem Statement
10
Quiz: Kadane's Decision
11
LeetCode 53 Maximum Subarray - Solution
12
LeetCode 53 Maximum Subarray - Example and Complexity Analysis
13
LeetCode 53 Maximum Subarray - Implementation
14
LeetCode 134 Gas Station - Problem Statement
15
Quiz: Gas Station Starting Point
16
LeetCode 134 Gas Station - Why Naive Fails
17
LeetCode 134 Gas Station - Solution
18
LeetCode 134 Gas Station - Example and Complexity Analysis
19
LeetCode 134 Gas Station - Implementation
20
LeetCode 763 Partition Labels - Problem Statement
21
LeetCode 763 Partition Labels - Why Naive Fails
22
LeetCode 763 Partition Labels - Solution
23
LeetCode 763 Partition Labels - Example and Complexity Analysis
24
LeetCode 763 Partition Labels - Implementation
25
LeetCode 45 Jump Game II - Problem Statement
26
LeetCode 45 Jump Game II - Why Naive Fails
27
LeetCode 45 Jump Game II - Solution
28
LeetCode 45 Jump Game II - Example and Complexity Analysis
29
LeetCode 45 Jump Game II - Implementation
30
LeetCode 55 Jump Game - Problem Statement
31
LeetCode 55 Jump Game - Why Naive Fails
32
LeetCode 55 Jump Game - Solution
33
LeetCode 55 Jump Game - Example and Complexity Analysis
34
LeetCode 55 Jump Game - Implementation
35
LeetCode 135 Candy - Problem Statement
36
LeetCode 135 Candy - Solution
37
LeetCode 135 Candy - Example and Complexity Analysis
38
LeetCode 135 Candy - Implementation
39
Common Mistakes
40
Section Recap
Bit Manipulation
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1
What is Bit Manipulation
2
Prerequisites
3
When to Use
4
When NOT to Use
5
LeetCode 136 Single Number - Problem Statement
6
Quiz: XOR Property
7
LeetCode 136 Single Number - Solution
8
LeetCode 136 Single Number - Example and Complexity Analysis
9
LeetCode 136 Single Number - Implementation
10
LeetCode 190 Reverse Bits - Problem Statement
11
LeetCode 190 Reverse Bits - Solution
12
LeetCode 190 Reverse Bits - Example and Complexity Analysis
13
LeetCode 190 Reverse Bits - Implementation
14
LeetCode 191 Number of 1 Bits - Problem Statement
15
LeetCode 191 Number of 1 Bits - Solution
16
LeetCode 191 Number of 1 Bits - Example and Complexity Analysis
17
LeetCode 191 Number of 1 Bits - Implementation
18
LeetCode 338 Counting Bits - Problem Statement
19
LeetCode 338 Counting Bits - Why Naive Fails
20
LeetCode 338 Counting Bits - Solution
21
LeetCode 338 Counting Bits - Example and Complexity Analysis
22
LeetCode 338 Counting Bits - Implementation
23
LeetCode 371 Sum of Two Integers - Problem Statement
24
Quiz: Bitwise Addition
25
LeetCode 371 Sum of Two Integers - Why Naive Fails
26
LeetCode 371 Sum of Two Integers - Solution
27
LeetCode 371 Sum of Two Integers - Example and Complexity Analysis
28
LeetCode 371 Sum of Two Integers - Implementation
29
LeetCode 421 Maximum XOR of Two Numbers - Problem Statement
30
LeetCode 421 Maximum XOR of Two Numbers - Solution
31
LeetCode 421 Maximum XOR of Two Numbers - Example and Complexity Analysis
32
LeetCode 421 Maximum XOR of Two Numbers - Implementation
33
Common Mistakes
34
Section Recap
Segment Tree
0/27
1
What is Segment Tree
2
Prerequisites
3
When to Use
4
When NOT to Use
5
LeetCode 307 Range Sum Query - Mutable - Problem Statement
6
Quiz: Segment Tree Advantage
7
LeetCode 307 Range Sum Query - Mutable - Solution
8
LeetCode 307 Range Sum Query - Mutable - Implementation
9
LeetCode 315 Count of Smaller Numbers After Self - Problem Statement
10
Quiz: Processing Order
11
LeetCode 315 Count of Smaller Numbers After Self - Why Naive Fails
12
LeetCode 315 Count of Smaller Numbers After Self - Solution
13
LeetCode 315 Count of Smaller Numbers After Self - Implementation
14
LeetCode 327 Count of Range Sum - Problem Statement
15
LeetCode 327 Count of Range Sum - Why Naive Fails
16
LeetCode 327 Count of Range Sum - Solution
17
LeetCode 327 Count of Range Sum - Implementation
18
LeetCode 493 Reverse Pairs - Problem Statement
19
LeetCode 493 Reverse Pairs - Why Naive Fails
20
LeetCode 493 Reverse Pairs - Solution
21
LeetCode 493 Reverse Pairs - Implementation
22
LeetCode 2407 Longest Increasing Subsequence II - Problem Statement
23
LeetCode 2407 Longest Increasing Subsequence II - Why Naive Fails
24
LeetCode 2407 Longest Increasing Subsequence II - Solution
25
LeetCode 2407 Longest Increasing Subsequence II - Implementation
26
Common Mistakes
27
Section Recap
30-Day LeetCode Study Plan
0/8
1
Study Plan Overview
2
Week 1: Foundation Patterns
3
Week 2: Core Data Structures
4
Week 3: Graphs and Recursion
5
Week 4: Specialized Patterns
6
How to Use Each Day
7
Adjusting for Your Timeline
8
Section Recap
Pattern 22: LeetCode Interview Patterns - Roadmaps | Repovive