Topic
Minimum Delete Operations to make all Elements of Array Same
Maximum Distance Between two Occurrences of Same Element in Array
Group Multiple Occurrence of Array Elements Ordered by first Occurrence
Smallest Subarray with k Distinct Numbers
Find Largest d in Array such that a + b + c = d
Minimum swaps required to bring all elements less than or equal to k together
Find top three repeated in array
Sorting using trivial hash function
Find duplicates in a given array when elements are not limited to a range
Check if Array Contains Contiguous Integers With Duplicates Allowed
Sum of f(a[i], a[j]) over all pairs in an array of n integers
Count of index pairs with equal elements in an array
Find Sum of all unique sub-array sum for a given array
Longest subarray not having more than K distinct elements
Maximum possible difference of two subsets of an array
Minimum operation to make all elements equal in array
Find subarray with given sum (Handles Negative Numbers)
Length of the largest subarray with contiguous elements
Count number of triplets with product equal to given number
Maximum difference between first and last indexes of an element in array
Find any one of the multiple repeating elements in read only array
Find elements which are present in first array and not in second
Check for Palindrome after every character replacement Query
Difference between highest and least frequencies in an array
Find four elements that sum to a given value (Hashmap)
k-th missing element in increasing sequence which is not present in a given sequence
How to check if two given sets are disjoint?
Check if a given array contains duplicate elements within k distance from each other
Check if two arrays are equal or not
Pair with given product
Find if there is a subarray with 0 sum
Find missing elements of a range
First element occurring k times in an array
Print all subarrays with 0 sum
Contains Duplicate
Count Substrings with equal number of 0s, 1s and 2s
Largest subarray with equal number of 0s and 1s
Non-overlapping sum of two sets
Find all pairs (a, b) in an array such that a % b = k
Count subarrays with equal number of 1’s and 0’s
Palindrome Substring Queries
Elements to be added so that all elements of a range are present in array
Count subarrays having total distinct elements same as original array
Cuckoo Hashing
Subarrays with distinct elements
Count quadruples from four sorted arrays whose sum is equal to a given value x
Count pairs from two linked lists whose sum is equal to a given value
Find sum of non-repeating elements (distinct) elements in an array
Find distinct elements common to all rows of a matrix
Numbers with prime frequencies greater than or equal to k
Convert an array to reduced form
Find pairs with given sum such that elements of pair are in different rows
Common elements in all rows of a given matrix
Find all permuted rows of a given row in a matrix
Given two unsorted arrays find all pairs whose sum is x
Sort elements by frequency
Find the first repeating element in an array of integers
Count items common to both the lists but with different prices
Minimum number of subsets with distinct elements
Longest Span with same Sum in two Binary arrays
Find Number of Employees Under every Employee
Smallest Element Repeated Exactly K Times
K-th Distinct Element in an Array
Cumulative Frequency of Count of Each Element in an Unsorted Array
Group Words With Same Set of Characters
First non Repeating Element
Second Most Repeated Word in a Sequence
Print All Distinct Elements of a Given Integer Array
Pair of Positive Negative Values in an Array
Remove Minimum Number of Elements Such That no Common Element Exist in both Array
Maximum Occurring Character
Count Pairs With Given Sum
Most Frequent Element in an Array
Find Pair with Greatest Product in Array
Smallest Subarray With all Occurrences of a Most Frequent Element
Find Top K (or Most Frequent) Numbers in a Stream
Next Greater Frequency Element
Change the Array into Permutation of Numbers From 1 to N