Sum of f(a[i], a[j]) over all pairs in an array of n integers

91

63.74 
Arrays  Hashing  maps 
lock


Convert a sentence into its equivalent mobile numeric keypad sequence

477

25.58 
Hashing  strings 
lock


Find the most frequent digit

573

30.89 
Hashing  Mathematical  strings 
lock


Count pairs Sum in matrices

403

23.33 
Hashing  Matrix  Sorting 
lock


Longest SubArray with Sum K

1249

12.41 
Array  Hashing  map 
lock


Numbers with prime frequencies greater than or equal to k

206

28.16 
Arrays  Hashing 
lock


Most frequent word in an array of strings

777

39.12 
Array  Hashing  Sorting 
lock

Adobe 
Winner of an election where votes are represented as candidate names

395

41.27 
Hashing  String 
lock

Adobe 
Check if a string is Isogram or not

473

35.52 
Hashing  String 
lock


Tiger Zinda Hai

475

21.89 
Array  Hashing 
lock


The Fibonacciprime number

333

11.41 
Fibonacci Number  Hashing  Prime  String 
lock


Check if array contains contiguous integers with duplicates allowed

4086

32.57 
Array  Hashing  Sorting 
lock

Amazon 
Rearrange an array such that arr[i] = i

788

45.81 
Arrays  Hashing 
lock


NonRepeating Element

1249

46.84 
Array  Hashing  STL 
lock

Snapdeal 
Print K smallest elements in their original order

1056

7.77 
Array  Hashing 
lock


Maximum distinct elements after removing K elements

471

35.88 
Array  Hashing  Heap 
lock


Count subarrays with equal number of 1â€™s and 0â€™s

351

18.8 
Array  Hashing 
lock


Smallest subarray with all occurrences of a most frequent element

149

26.17 
Array  Hashing 
lock


Longest subarray with sum divisible by K

450

18 
Array  Hashing 
lock


Distinct Elements in a Stream

334

20.36 
Array  Hashing  Heap 
lock


Joey doesn't share food

76

7.89 
dfs  Hashing 
lock


Morning Assembly

135

17.04 
Hashing 
lock


Completing tasks

518

29.92 
Array  Hashing 
lock


GeeksForGeeks New System

504

34.33 
Hashing  map 
lock


Count number of elements between two given elements in array

1592

28.64 
Array  Hashing 
lock


Count of substrings containing K ones

261

16.48 
Hashing  String 
lock


Frequency of each element in an unsorted array

801

22.72 
Array  Hashing 
lock


Maximum number of characters between any two same character

374

22.46 
Hashing  String 
lock


Sort the string in descending order

1155

18.44 
Hashing  String 
lock


Sum Indexes

444

26.8 
Hashing 
lock


Incomplete Array

388

22.42 
Hashing 
lock


Ana and Sweets

218

42.2 
Hashing 
lock


Numbers containing 1, 2 and 3

5861

12.46 
Array  Hashing  Mathematical 
lock

GoldmanSachs 
Find unique element

956

40.69 
Array  Hashing 
lock


Difference between highest and lowest occurrence

1165

18.2 
Array  Hashing 
lock


Sort String

1020

40.78 
Hashing  Sorting  String 
lock


Count the characters

2037

20.96 
Hashing  String 
lock

Zoho 
Pairs of Non Coinciding Points

191

25.65 
Hashing  Maths 
lock


String Subsequence Game

549

15.66 
Hashing  String 
lock

Yatra 
Smallest number repeating K times

2275

27.47 
Array  Hashing 
lock


Anagram Palindrome

1233

37.47 
Hashing  palindrome  String 
lock


Maximum possible sum

252

30.95 
Array  Hashing 
lock


Minimum Distinct Ids

1379

23.64 
Hashing  Sorting 
lock

MorganStanley 
Mail System Design

1077

17.18 
doubly linked list  Hashing  LinkedList 
lock


In First But Second

2042

39.08 
Array  Hashing 
lock

Accolite 
Minimum indexed character

1860

49.95 
Hashing  STL  String 
lock

OlaCabs 
Find distinct elements

637

17.9 
Hashing  Sorting 
lock


Sum of length

285

25.96 
Array  Hashing 
lock


Sort by Absolute Difference

2011

34.26 
Array  Hashing 
lock


Swapping pairs make sum equal

1628

35.01 
Array  Hashing 
lock


Check Arithmetic Progression

597

36.18 
Array  Hashing 
lock


Count pair sum

982

43.48 
Array  Hashing  Sorting  STL 
lock


Find pairs with given relation

353

23.51 
Array  Hashing 
lock


Kth distinct element

426

29.58 
Hashing 
lock


First Come First Serve

347

56.2 
Array  Hashing 
lock


Equivalent SubArrays

154

53.9 
Array  Hashing 
lock


Count the elements

4641

40.75 
Array  Hashing 
lock

Amazon  Yatra 
Sum equals to Sum

3808

41.96 
Array  Hashing 
lock

Amazon 
Group Anagrams Together

2716

43.92 
Hashing  String 
lock

Amazon  Snapdeal 
Uncommon characters

4306

36.69 
Hashing  String 
lock

Amazon 
Array Subset of another array

4279

38.14 
Array  Binary search  Hashing  Searching 
lock

GE  Qualcomm 
First element to occur k times

2030

22.76 
Array  Hashing 
lock


Largest Fibonacci Subsequence

1390

52.66 
Array  fibonacci  Hashing 
lock

Facebook 
Smallest distinct window

4248

28.06 
Array  Hashing  String 
lock

Amazon  Dailyhunt 
Smallest window in a string containing all the characters of another string

3686

25.47 
Hashing  String 
lock

Amazon  MakeMyTrip  Streamoid Technologi 
Zero Sum Subarrays

2728

37.35 
Array  Hashing 
lock

Microsoft 
Rahul and his Villa

304

13.16 
Array  Hashing 
lock


Fake Profile

1261

29.34 
Hashing  String 
lock


Total distance travelled in an array

762

54.86 
Array  Hashing 
lock


Find first repeated character

2697

28.7 
Hashing  String 
lock


Check if frequencies can be equal

2544

13.84 
Hashing  String 
lock


Find all pairs with a given sum

13209

14.39 
Array  Hashing 
lock

Amazon  Facebook 
Recamanâ€™s sequence

570

42.28 
Hashing  Maths  Recursion 
lock


First nonrepeating character in a stream

11825

24.08 
Hashing  LinkedList  Queue 
lock

Amazon  Flipkart  Microsoft  Payu  Yahoo 
Love For The Twins

791

46.78 
Hashing  Maths 
lock


Unique Numbers

1899

39.81 
Hashing 
lock

amazon 
Sherlock a Detective

480

41.04 
Array  Hashing 
lock


Check if two arrays are equal or not

6856

41.98 
Array  Hashing  Sorting 
lock

GoldmanSachs 
Ladoo problem

542

35.42 
Hashing 
lock


Longest K unique characters substring

2302

29.15 
Hashing  map  String 
lock

Google 
Find all four sum numbers

8212

10.78 
Array  Hashing  Sorting 
lock

Amazon  Google  Microsoft 
Tom and String

359

27.02 
Hashing  String 
lock


Demonitisation

602

19.93 
Hashing  String 
lock


Pairs with given XOR

1447

28.61 
BitAlgorithm  Hashing 
lock


Equal 0, 1 and 2

491

42.16 
Hashing  String 
lock


Satisfy the equation

739

17.19 
Hashing 
lock


Find the Odd Occurence

11531

45.35 
Array  BitAlgorithm  Hashing 
lock

Amazon  Snapdeal 
Longest consecutive subsequence

4400

44.59 
Hashing 
lock

Amazon  Walmart labs 
Lucky Number

784

24.49 
Hashing  simplemath 
lock

Epic systems 
A Simple Fraction

5143

16.08 
Hashing  Maths 
lock

Amazon  Microsoft 
Count distinct pairs with difference k

1881

42.53 
Hashing  map 
lock

Facebook 