Solve Problems on Arrays [Easy -> Medium -> Hard]

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Easy

#	Problem	Links	Status	Action
1	Largest Element in an Array
2	Second Largest Element in an Array without sorting
3	Check if the array is sorted
4	Remove duplicates from Sorted array
5	Left Rotate an array by one place
6	Left rotate an array by D places
7	Move Zeros to end
8	Linear Search
9	Find the Union
10	Find missing number in an array
11	Maximum Consecutive Ones
12	Find the number that appears once, and other numbers twice.
13	Longest subarray with given sum K(positives)
14	Longest subarray with sum K (Positives + Negatives)

Medium

#	Problem	Links	Status	Action
1	2Sum Problem
2	Sort an array of 0's 1's and 2's
3	Majority Element (>n/2 times)
4	Kadane's Algorithm, maximum subarray sum
5	Print subarray with maximum subarray sum (extended version of above problem)
6	Stock Buy and Sell
7	Rearrange the array in alternating positive and negative items
8	Next Permutation
9	Leaders in an Array problem
10	Longest Consecutive Sequence in an Array
11	Set Matrix Zeros
12	Rotate Matrix by 90 degrees
13	Print the matrix in spiral manner
14	Count subarrays with given sum

Hard

#	Problem	Links	Status	Action
1	Pascal's Triangle
2	Majority Element (n/3 times)
3	3-Sum Problem
4	4-Sum Problem
5	Largest Subarray with 0 Sum
6	Count number of subarrays with given xor K
7	Merge Overlapping Subintervals
8	Merge two sorted arrays without extra space
9	Find the repeating and missing number
10	Count Inversions
11	Reverse Pairs
12	Maximum Product Subarray