Hard (11)

1. Pascal's Triangle
   • Triangle I
   • Triangle I
2. Majority Elements
3. Three Sum
4. 4-Sum Problem
5. Largest Subarray with 0 Sum
6. Count number of subarrays with given xor K
   • GeeksforGeeks
   • LeetCode
7. Merge Overlapping Subintervals
8. Merge two sorted arrays without extra space
9. Find Repeated and Missing Numbers
   • LeetCode
   • GeeksforGeeks
10. Count Inversions
    • GeeksforGeeks
    • LeetCode
11. Reverse Pairs
12. Maximum Product Subarray