Practice Java Basic Level Coding Problems

Total Problems: 50

Java Basic Coding Problems

Total Points Scored: 0/282

1. Two Sum

DeloitteIBM + 2 more

Solve

Easy 455 31.43
2. Valid Parentheses

CapgeminiLTIMindtree + 2 more

Solve

Easy 110 45.45
3. Reverse a String

D. E. ShawOracle + 1 more

Solve

Easy 82 65.85
4. Palindrome Check

EYPhillips + 1 more

Solve

Easy 61 68.85
5. FizzBuzz Implementation

HCL TechnologiesKPMG + 1 more

Solve

Easy 67 50.75
6. Merge Two Sorted Arrays

AdobePwC + 1 more

Solve

Easy 52 44.23
7. First Unique Character in a String

D. E. ShawPwC + 1 more

Solve

Easy 32 75
8. Remove Duplicates from Sorted Array

SwiggyWalmart + 1 more

Solve

Easy 25 72
9. Valid Anagram

AccentureDeloitte + 1 more

Solve

Easy 28 64.29
10. Maximum Subarray

PwCTech Mahindra + 1 more

Solve

Easy 22 72.73
11. Array to ArrayList

ArctwisteBay + 1 more

Solve

Easy 16 81.25
12. Intersection of Two Arrays

FacebookTech Mahindra + 1 more

Solve

Easy 17 76.47
13. If LinkedList Has Cycle

EYPhillips + 1 more

Solve

Easy 14 71.43
14. Stack using Array

AdobeEY + 1 more

Solve

Easy 14 71.43
15. Binary Search

WalmartAlgorithms + 1 more

Solve

Easy 20 45
16. Queue using Array

TCS (Tata Consultancy Services)Tutorialspoint + 2 more

Solve

Easy 9 100
17. Find Majority Element (Boyer-Moore Algorithm)

PhillipsShopify + 2 more

Solve

Easy 11 72.73
18. Characters in a String

CognizantDeloitte + 1 more

Solve

Easy 12 91.67
19. Reverse LinkedList

HCL TechnologiesSamsung + 1 more

Solve

Easy 10 90
20. Check if Number is Palindrome

SnowflakeTutorix + 1 more

Solve

Easy 11 81.82
21. Missing Number in Array

AirbnbTech Mahindra + 2 more

Solve

Easy 10 90
22. Selection Sort

eBayTutorix + 2 more

Solve

Easy 13 38.46
23. Bubble Sort

D. E. ShawHCL Technologies + 1 more

Solve

Easy 7 71.43
24. HashSet using Array

D. E. ShawOracle + 2 more

Solve

Easy 9 44.44
25. HashMap using Array

HCL TechnologiesKPMG + 2 more

Solve

Medium 5 100
26. Roman to Integer Conversion

GoogleSnowflake + 1 more

Solve

Easy 6 83.33
27. Valid Perfect Square

D. E. ShawWalmart + 1 more

Solve

Easy 8 62.5
28. Power of Two

HCL TechnologiesTutorix + 1 more

Solve

Basic 11 45.45
29. Power of Three

SwiggyNumber

Solve

Basic 4 100
30. Count Primes less than n

EYWalmart + 1 more

Solve

Easy 8 62.5
31. Binary Strings

AccenturePwC + 1 more

Solve

Easy 4 75
32. Best Time to Buy and Sell Stock

EYSamsung + 1 more

Solve

Easy 3 100
33. Pascal's Triangle

SamsungTech Mahindra + 2 more

Solve

Easy 4 75
34. Move Zeroes to End

KPMGTutorix + 1 more

Solve

Easy 7 71.43
35. Climbing Stairs

PwCZomato + 1 more

Solve

Easy 5 60
36. All Disappeared Numbers

PhillipsPwC + 2 more

Solve

Easy 4 100
37. Longest Common Prefix

DropboxTech Mahindra + 1 more

Solve

Easy 4 100
38. String matching

CapgeminiSwiggy + 1 more

Solve

Easy 5 80
39. First and Last Position in Sorted Array

GoogleTutorialspoint + 1 more

Solve

Easy 3 100
40. Square Root Function

Goldman SachsSamsung + 1 more

Solve

Easy 3 100
41. Valid Sudoku

AccentureHCL Technologies + 1 more

Solve

Medium 3 66.67
42. Running Sum of 1D Array

eBaySwiggy + 3 more

Solve

Easy 3 66.67
43. Pivot Index

HCL TechnologiesZomato + 2 more

Solve

Easy 6 33.33
44. Sorted Array to Binary Search Tree

AppleTech Mahindra + 1 more

Solve

Easy 7 57.14
45. Check if Tree is Balanced

SwiggyWalmart + 1 more

Solve

Easy 7 71.43
46. Height of Binary Tree

CapgeminiZomato + 1 more

Solve

Medium 5 60
47. Leaf Nodes in Binary Tree

Goldman SachsPhillips + 1 more

Solve

Medium 4 75
48. Path Sum in Binary Tree

KPMGSwiggy + 1 more

Solve

Medium 3 66.67
49. Symmetric Tree Check

EYPhillips + 2 more

Solve

Medium 3 100
50. Merge Two Binary Trees

eBayPhillips + 1 more

Solve

Easy 8 62.5

Java Basic Coding Problems

1. Two Sum

2. Valid Parentheses

3. Reverse a String

4. Palindrome Check

5. FizzBuzz Implementation

6. Merge Two Sorted Arrays

7. First Unique Character in a String

8. Remove Duplicates from Sorted Array

9. Valid Anagram

10. Maximum Subarray

11. Array to ArrayList

12. Intersection of Two Arrays

13. If LinkedList Has Cycle

14. Stack using Array

15. Binary Search

16. Queue using Array

17. Find Majority Element (Boyer-Moore Algorithm)

18. Characters in a String

19. Reverse LinkedList

20. Check if Number is Palindrome

21. Missing Number in Array

22. Selection Sort

23. Bubble Sort

24. HashSet using Array

25. HashMap using Array

26. Roman to Integer Conversion

27. Valid Perfect Square

28. Power of Two

29. Power of Three

30. Count Primes less than n

31. Binary Strings

32. Best Time to Buy and Sell Stock

33. Pascal's Triangle

34. Move Zeroes to End

35. Climbing Stairs

36. All Disappeared Numbers

37. Longest Common Prefix

38. String matching

39. First and Last Position in Sorted Array

40. Square Root Function

41. Valid Sudoku

42. Running Sum of 1D Array

43. Pivot Index

44. Sorted Array to Binary Search Tree

45. Check if Tree is Balanced

46. Height of Binary Tree

47. Leaf Nodes in Binary Tree

48. Path Sum in Binary Tree

49. Symmetric Tree Check

50. Merge Two Binary Trees