| Pair with Target Sum (easy) | https://leetcode.com/problems/two-sum-ii-input-array-is-sorted/description/ | ✅ | |
| Rearrange 0 and 1 | https://www.geeksforgeeks.org/problems/segregate-0s-and-1s5106/1 | ✅ | |
| Remove Duplicates (easy) | https://leetcode.com/problems/remove-duplicates-from-sorted-list/ | ✅ | |
| Squaring a Sorted Array (easy) | https://leetcode.com/problems/squares-of-a-sorted-array/ | ✅ | |
| Triplet Sum to Zero (medium) | https://leetcode.com/problems/3sum/ | ✅ | |
| Triplet Sum Close to Target (medium) | https://leetcode.com/problems/3sum-closest/ | ✅ | |
| Triplets with Smaller Sum (medium) | https://www.geeksforgeeks.org/problems/count-triplets-with-sum-smaller-than-x5549/1 | ✅ | |
| Subarrays with Product Less than a Target (medium) | https://leetcode.com/problems/subarray-product-less-than-k/ | --- sw | |
| Dutch National Flag Problem (medium) | https://leetcode.com/problems/sort-colors/description/ | ✅ | |
| Problem Challenge 1: Quadruple Sum to Target (medium) | https://leetcode.com/problems/4sum/ | ✅ | |
| Problem Challenge 2: Comparing Strings containing Backspaces (medium) | https://leetcode.com/problems/backspace-string-compare/ | | |
| Problem Challenge 3: Minimum Window Sort (medium) | https://leetcode.com/problems/shortest-unsorted-continuous-subarray/ | | |
| 2. Pattern: Fast & Slow pointers | | | |
| LinkedList Cycle (easy) | https://leetcode.com/problems/linked-list-cycle/ | | |
| Start of LinkedList Cycle (medium) | https://leetcode.com/problems/linked-list-cycle-ii/ | | |
| Happy Number (medium) | https://leetcode.com/problems/happy-number/ | | |
| FIND DUPLICATE NUMBER | https://leetcode.com/problems/find-the-duplicate-number/description/ | | |
| Middle of the LinkedList (easy) | https://leetcode.com/problems/middle-of-the-linked-list/ | | |
| Problem Challenge 1: Palindrome LinkedList (medium) | https://leetcode.com/problems/palindrome-linked-list/ | | |
| Problem Challenge 2: Rearrange a LinkedList (medium) | https://leetcode.com/problems/reorder-list/ | | |
| Problem Challenge 3: Cycle in a Circular Array (hard) | https://leetcode.com/problems/circular-array-loop/ | | |