Programming challenges for beginners and mid-level C programmers.

• Arrays
• Bit Manipulations
• Linked List
• Linux Internals
• Memory Management
• Pointers
• Searching
• Sorting
• Stacks and Queues
• Strings
• Structures and Unions

• Array Intersection Calculator
• Array Leaders Finder
• Array Product excluding Self Calculator
• Array Right Rotator
• Divisible Sum Pairs Checker
• Duplicate Number Detector
• Duplicate Remover without Libraries
• Equilibrium Index Finder
• kth Max-Min Element Retriever
• Longest Consecutive Subsequence Locator
• Majority Element Identifier
• Max-Min Finder in an Unsorted Array
• Minimum Sum Subarray Finder
• Missing Number Finder in a 1 to 500 Sequence
• Multiple Duplicates Identifier
• Occurrence Counter in a Sorted Array
• Peak Element Identifier
• Positive Negative Rearranger
• Quicksort Array Sorter
• Self Referential Array Transformer
• Sorted Arrays Merger
• Target Sum Pairs Locator
• Zero Mover to the Left
• Zero Sum Subarray Detector

• Calculate a Power b using Bit Manipulation
• Check for Alternate Bits
• Check if Binary Representation of a Number is Palindrome
• Check if Number is Multiple of 3
• Clear Bits from MSB to i
• Convert Decimal to Binary
• Count Number of Flips to Convert A to B
• Count Set Bits
• Detecting Power of Two
• Determine if Two Integers have Opposite Signs
• Extract n Bits
• Find Parity of a Number
• Find Two Unique Numbers in Array
• Find a Unique Number in an Array
• Generate All Possible Combinations of n Bits
• Implement Bitwise Right Shift
• Implement XOR without using XOR operator
• Isolate the Rightmost Set bit
• Mask Certain Bits
• Reverse Bits in a Byte
• Rotate Bits
• Set Bits without Using Arithmetic Operations
• Single Number in Array
• Swap Odd and Even Bits
• Toggle 3rd and 5th Bits

• Add Numbers Represented by Lists
• Clone Linked List with Random Pointer
• Common Ancestor in Binary Tree Doubly Linked List
• Compare Strings as Linked Lists
• Convert Binary Number to Integer
• Delete Alternate Nodes
• Detect and Remove Loop
• Detect Cycle in Linked List
• Find Middle Element
• Find nth Node from End
• Flatten Multi-level Linked List
• Intersection Point Two Lists
• Length of Linked List
• Linked List is Palindrome
• Merge Sort on Linked List
• Merge Two sorted lists
• Move Last Element to Front
• Pairwise Swap Elements
• Partition Linked List around Value
• Remove Duplicate Unsorted
• Remove Nodes of Specific Value
• Reverse Linked List
• Reverse Linked List No recursion
• Segregate Even and Odd Nodes
• Sum of Linked Lists using Stack

• Command Line Argument Parser
• CPU Information Fetcher
• CPU Scheduling Algorithm
• Custom Signal Handling
• Custom Init Process
• Custom malloc free
• Custom ps command
• File Copy Program
• Filesystem Traversal opendir readdir
• Implement Priority Inversion Handling
• Implement Simple Shell
• Implement chmod Command
• Implement ping Command
• Implement tail Command
• Implement watch Command
• Implement whois Command
• Mutex based File Access
• Priority Inversion Problem
• Process Forking Waiting
• Semaphore based Producer Consumer
• Terminal Multiplexer
• Thread Creation Synchronization
• User Space File Reader
• User Space to Kernel Space Communication
• Zero Copy Data Transfer

• Custom strdup Function
• Dynamic Array
• Fragmentation Detector
• Garbage Collector Simulator
• Heap Metadata Inspector
• Memory Bound Priority Queue
• Memory-Mapped Circular Buffer
• Memory Access Logger
• Memory Alignment Checker
• Memory Defragmenter
• Memory Footprint Analyzer
• Memory Initialization Library
• Memory Leak Detector
• Memory Offset Calculator
• Memory Overlay Management
• Memory Pool
• Memory Saefty Checker
• Memory Statistics Reporter
• Object Serialization
• Segmented Memory Allocator
• Slab Allocator
• Stack-based Memory Allocator
• Stack Overflow Detector
• Virtual Memory Simulator
• Write-Once Memory Simulator

• Calculate Dot Product of Vectors
• Check Pointers Point to Same Array
• Check String Palindrome
• Check String Prefix
• Concatenate Strings without Lib
• Convert String to Lowercase
• Count Array Elements without Loop
• Custom memcpy Function
• Custom strtok Function
• Detect Pointer out of Bounds
• Find Array Intersection
• Find Common Elements in Sorted Arrays
• Find Data Type Size without sizeof
• Find First Non Repeated Charcater
• Find Linked List Length
• Find Overlapping Elements in Arrays
• Flatten 2D Array to 1D
• Memory Leak Detector
• Merge Two Sorted Arrays
• Move 2D Point
• Rotate Array by k Elements
• Segregate Even and Odd using Pointers
• Split String into Halves
• Swap Two Strings using Pointers
• Trim String Whitespace

• Binary Search Recursive
• Count Array Rotations
• Count Number Occurrences
• Exponential Search
• Fibonacci Search
• find Kth Max-Min
• Find First and Last Occurrence
• Find Fixed Point
• Find Majority Element
• Find Missing Number 1 to n
• Find Peak Element
• Find Repeating Missing
• Find Smallest Missing
• Interpolation Search
• Jump Search
• Search Bitonic Array
• Search nearly Sorted Array
• Search Sorted Array
• Search Sorted Matrix
• Search Sorted Rotated Array
• Search Unknown Length Array
• Search Unsorted Array
• Sentinal Search
• Ternary Search
• Two Numbers sum N

• Bead Sort
• Bitonic Sort
• Bogo Sort
• Bucket Sort
• Cocktail Sort
• Comb Sort
• Counting Sort for Negative Numbers
• Cycle Sort
• Dynamic Gap Shell Sort
• Gnome Sort
• Heap Sort with Binary Max Heap
• In Place Merge Sort
• Iterative Quick Sort
• Linked List Insertion Sort
• Odd Even Sort
• Optimized Bubble Sort
• Pancake Sort
• Patience Sort
• Permutation Sort
• Pigeonhole Sort
• Radix Sort for Floating Points
• Recursive Mereg Sort
• Sleep Sort
• Stooge Sort
• Tim Sort

• Balanced Parentheses Stack
• Byte-Packing Stack
• Circular Queue
• Command Parser
• Expression Validator
• Function Call Logger
• Min-Element Stack
• Multi-Stack Array
• Nested Statement counter
• Palindrome Checker
• Post-order Traversal Stack
• Priority Queue Heap
• Queue based Cache
• Queue based Logger
• Queue based Sequence Generator
• Querue based Text filter
• Queue Two Priorities
• Queue from Stacks
• Radix Sort Queue
• Recursive to Iterative Converter
• Stack based Calculator
• Stack based Text Editor
• Stack Sorting
• String Message Queue
• Undo Redo Stack

• Alphabetically Encoding a String
• Checking Anagrams between Two Strings
• Counting balanced Zero-One Substrings
• Counting Character Occurrences in a String
• Counting Substring Occurrences in a String
• Coiutning Vowels and Consonants in a String
• Discovering the Longest Palindromic Substring
• Evaluating Repeated Substring Patterns
• Evaluating String Interleaving
• Finding Lexicographically Minimal String Rotation
• Finding the First Unique Character in a String
• Generating All String Permutations
• Identifying Duplicate Characters in a String
• Identifying Longest Substring without Repeats
• Listing Multiple Occurrences of Characters in a String
• Minimizing Palindromic Partitions
• Palindrome Validation for Strings
• Pangram Verification
• Recursive String Reversal
• Reversing Words in a Sentence without Libraries
• String to Integer Conversion without Built-in Functions
• Validating Balanced PArentheses in a String
• Verifying Numeric-only Characters in a String
• Verifying String Rotations

• 32bit Value Access
• 3D Point Distance
• 4-Byte Value Conversion
• IP Address Conversion
• IP Address Representation
• Book Price Discount
• Color RGB CMYK
• Command Parsing
• Complex Number Operations
• Data Packet Serialization
• Data Difference
• Device Config bitfields
• Employee Address
• Endianness Conversion
• Error Code Representation
• File Attributes
• Library Database
• Menu Item Function Pointer
• Network Packet Type
• Structure Memory Optimization
• Student Average Marks
• Student Linked List
• Time Operations
• Variable Datatype Array
• Vehicle Extended Structure