Ruby Coding Practice

Solve Kth Missing Positive Number using Ruby Language

Solve Kth Missing Positive Number using Ruby to enhance your skills with ruby coding practice , master coding concepts, and prepare for interviews with practical exercises and detailed solutions.

Kth Missing Positive Number

Difficulty : Medium

Categories :

  • Searching algorithms

Given a sorted integer array arr and an integer k, find the k-th missing positive integer in the array. The first missing positive integer starts from 1.

If there are fewer than k missing positive integers in the array, return the (n+k)th positive integer, where n is the count of missing numbers found.

Constraints:

  • 1 ≤ arr.length ≤ 10^5
  • 1 ≤ arr[i] ≤ 10^5
  • 1 ≤ k ≤ 10^5
  • arr is sorted in ascending order
  • Solution should have better time complexity than O(n)

Examples:

Input: arr = [2,3,5,9], k = 4
Output: 7
Explanation:
Missing numbers are: 1,4,6,7,8
The 4th missing number is 7
Input: arr = [1,3,4], k = 1
Output: 2
Explanation:
The first missing positive integer is 2

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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.