1. Basics of Arrays

• Concept: Understanding what arrays are, how they are stored, and basic operations like insertion, deletion, and traversal.
• Two-Dimensional Arrays: Learning about how 2D arrays are stored and accessed.
• Traversal Problems:
  • Wave Form Traversal: LeetCode Problem - Diagonal Traverse
  • Spiral Form Traversal: LeetCode Problem - Spiral Matrix

2. Basics of Strings

• Concept: Understanding how strings are stored in memory and basic string operations.
• Basic Problems:
  • Reverse a String: LeetCode Problem - Reverse String
  • Check if a String is a Palindrome: LeetCode Problem - Valid Palindrome
  • Remove Vowels from a String: LeetCode Problem - Remove Vowels from a String
  • Practice Link: LeetCode - Strings Problems

3. Sorting Algorithms

• Selection Sort: LeetCode Discussion on Selection Sort
• Bubble Sort: LeetCode Discussion on Bubble Sort
• Insertion Sort: LeetCode Problem - Insertion Sort List
• Practice Link: LeetCode - Sorting Problems

4. Time and Space Complexity

• Learning about the analysis of algorithms in terms of time and space complexity.

5. Algorithms on Arrays

• Binary Search: LeetCode Problem - Binary Search
• Dutch National Flag Algorithm:
  • Sort 0s and 1s: LeetCode Problem - Sort Colors (0s and 1s variation)
  • Sort 0s, 1s, and 2s: LeetCode Problem - Sort Colors
• Two Pointers Technique:
  • Pair Sum: LeetCode Problem - Two Sum
  • Triplet Sum: LeetCode Problem - 3Sum
• Sliding Window Algorithm: LeetCode Problem - Minimum Size Subarray Sum
• Kadane's Algorithm: LeetCode Problem - Maximum Subarray

6. Applications on Arrays

• Overlapping Intervals: LeetCode Problem - Merge Intervals
• Second Largest Element in an Array: LeetCode Problem - Kth Largest Element in an Array
• Minimum Number of Platforms: LeetCode Problem - Minimum Number of Platforms (Discussion and Custom Problems)

7. Applications on Multi-Dimensional Arrays

• Search in Row-Wise and Column-Wise Sorted Matrix: LeetCode Problem - Search a 2D Matrix II
• In-place Rotate Matrix by 90 Degrees: LeetCode Problem - Rotate Image
• Matrix Median: LeetCode Discussion - Matrix Median
• Other Questions: LeetCode - 2D Arrays Problems

8. Applications on Strings

• Longest Substring Without Repeating Characters (Sliding Window): LeetCode Problem - Longest Substring Without Repeating Characters
• Anagram Difference (Hashmap): LeetCode Problem - Minimum Number of Steps to Make Two Strings Anagram
• Shortest Substring with All Characters (Two Pointers): LeetCode Problem - Minimum Window Substring
• Minimum Operations to Make Strings Equal (Hashmap): LeetCode Problem - Minimum Operations to Make Array Equal
• Other Questions: LeetCode - String Problems

This roadmap now provides a path to mastering arrays and strings using LeetCode problems, which are widely recognized for interview preparation.