Algorithm Patterns - Interactive Coding Tutorials
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Two Pointer Pattern
Start HereMaster efficient array manipulation with two pointers
Core Concepts
- Two pointer technique fundamentals
- When to use two pointers
- Common variations and templates
Problem Solving
- Two Sum variations
- Three Sum problems
- Sliding window vs Two pointers
Sliding Window
Solve substring and subarray problems efficiently
Window Technique
- Fixed vs Dynamic windows
- Window size manipulation
- Optimization techniques
Common Applications
- Maximum sum subarrays
- String pattern matching
- Minimum window substring
Fast & Slow Pointers
Detect cycles and find middle elements
Floyd's Algorithm
- Cycle detection in arrays
- Linked list cycles
- Finding cycle start
Pattern Applications
- Middle of linked list
- Happy number problem
- Palindrome linked list
Merge Intervals
Handle interval-based problems effectively
Interval Basics
- Sorting intervals
- Overlapping detection
- Interval merging logic
Advanced Topics
- Meeting rooms problems
- Insert interval variations
- Interval list intersections
Cyclic Sort
Optimize sorting for numbers in range
Pattern Recognition
- When to use cyclic sort
- Array number properties
- In-place sorting technique
Problem Types
- Missing number variations
- Duplicate number finding
- Array permutations
In-place Reversal
Reverse linked lists with O(1) space
Reversal Technique
- Basic list reversal
- Partial list reversal
- Memory optimization
Advanced Problems
- K groups reversal
- Alternating reversal
- Sublist reversal
Tree BFS
Level-order tree traversal patterns
BFS Fundamentals
- Queue-based traversal
- Level tracking
- Node connections
Common Problems
- Level averages
- Zigzag traversal
- Level order successor
Tree DFS
Solve tree problems using recursion
DFS Patterns
- Preorder traversal
- Inorder traversal
- Postorder traversal
Path Problems
- Path sum variations
- Tree diameter
- Binary tree paths
Two Heaps
Manage data streams with dual heaps
Heap Basics
- Max-heap vs Min-heap
- Median maintenance
- Stream processing
Applications
- Find median from stream
- Schedule tasks
- Interval scheduling
Subsets
Generate combinations and permutations
Subset Pattern
- Iterative generation
- Recursive approach
- Duplicate handling
Variations
- Permutations
- Combinations
- String permutations
Modified Binary Search
Advanced binary search variations
Search Patterns
- Order-agnostic search
- Rotated array search
- Bitonic array search
Complex Problems
- Search range
- Search insert position
- Peak element
Greedy Algorithms
Make locally optimal choices
Greedy Approach
- Optimal substructure
- Greedy choice property
- Solution building
Classic Problems
- Activity selection
- Fractional knapsack
- Huffman coding
Backtracking
Systematic solution search with pruning
Core Concepts
- State space tree
- Constraint satisfaction
- Pruning techniques
Famous Problems
- N-Queens
- Sudoku solver
- Word search
Dynamic Programming
Final ProjectOptimize solutions with memoization
DP Fundamentals
- Optimal substructure
- State definition
- Memoization technique
Common Patterns
- 0/1 Knapsack
- Longest sequences
- Grid traversal
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