Array
2 Sum problem
3Sum Problem
4Sum Problem
Count Inversions
Count number of subarray with given xor K
Count subarrays with give sum
Find the Union
Find the number that appears once and others twice
Finding the repeating and missing number
Index
Kadanes Algorithm
Largest Subarray with zero sum
Leaders in an array problem
Longest Consecutive Sequence in an Array
Longest subarray with given sum K
Majority Element
Maximum Product Subarray
Merge Overlapping Intervals
Merge two arrays without extra space
Next Permutation
Pascals Triangle
Print subarray with maximum subarray sum
Print the matrix in spiral manner
Rearrange the array in alternating positive and negative items
Reverse Pairs
Rotate Matrix by 90degrees
Set Matrix Zeroes
Sort an array or 0's 1's 2's
Stock Buy and Sell
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Reverse Pairs
https://leetcode.com/problems/reverse-pairs/