C Coding Practice

Solve Remove Duplicates from Sorted Array using C Language

Solve Remove Duplicates from Sorted Array using C to enhance your skills with c coding practice , master coding concepts, and prepare for interviews with practical exercises and detailed solutions.

Remove Duplicates from Sorted Array

Difficulty : Medium

Categories :

  • Arrays

Given a sorted array arr, modify the array in-place to contain only distinct elements and return the size of the modified array. The distinct elements should appear at the beginning of the original array.

Important Notes:

  • Do not use Set or HashMap to solve the problem
  • The array is already sorted in ascending order
  • Modify the original array in-place
  • Return only the size of the modified array (number of distinct elements)

Constraints:

  • 1 ≤ arr.length ≤ 105
  • 1 ≤ arr[i] ≤ 106

Examples:

Input: arr = [2,2,2,2,2]
Output: 1
Explanation: After removing duplicates, only one 2 remains. The first position of the modified array will contain 2.
Input: arr = [1,2,2,3,4,4,4,5,5]
Output: 5
Explanation: After removing duplicates, the first 5 positions will contain [1,2,3,4,5].

Follow-up:

Can you implement the solution with O(1) extra space and O(n) time complexity using the two-pointer technique?

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Choose from the following categories

Arrays A collection of elements stored in contiguous memory locations, allowing efficient random access and manipulation.

Linked Lists A linear data structure where each element (node) points to the next, offering dynamic memory allocation and efficient insertions/deletions.

Trees A hierarchical data structure with nodes connected by edges, used in applications like databases, file systems, and parsing.

Graphs A collection of nodes (vertices) connected by edges, representing relationships, widely used in networking, routing, and social networks.

Dynamic Programming An optimization technique that solves problems by breaking them into overlapping subproblems and storing their results.

Backtracking A problem-solving method that explores all possibilities recursively, backtracking when a solution is not feasible.

Sorting Algorithms Techniques for arranging elements in a specific order, such as quicksort, mergesort, and bubble sort, essential for data organization.

Searching Algorithms Methods for finding elements in a dataset, such as binary search, linear search, and graph traversal techniques.

Mathematics A field of study involving numbers, calculations, and logical reasoning, forming the foundation for algorithms and problem-solving.

Recursion A programming technique where a function calls itself to solve smaller instances of the same problem, often used in divide-and-conquer approaches.

Bit Manipulation Operations performed directly on binary representations of data, used for efficient computations and optimization tasks.