Get to know how you can ace the interviews of reputed product-based companies like Flipkart and Snapdeal by practicing basic interview questions on CodeStudio.

Problem Title

Difficulty

Avg Time to solve

Attempted

Preorder Binary Tree

17

Easy

10 mins

39165

Postorder Binary Tree

4

Easy

15 mins

35422

Merge Intervals

70

Moderate

20 mins

3842

Sliding Maximum

13

Moderate

25 mins

1153

Symmetric Tree

19

Easy

20 mins

2003

Implementation: HashMap

63

Easy

30 mins

3588

Valid String

29

Moderate

18 mins

650

LRU Cache Implementation

26

Moderate

25 mins

1252

Decode String

6

Easy

15 mins

82

Best Time to Buy and Sell

8

Moderate

20 mins

232

Maximum Width In Binary Tree

11

Moderate

38 mins

1180

Boundary Traversal of Binary Tree

79

Hard

20 mins

4048

Container With Most Water

35

Moderate

15 mins

2240

Boxes Of Chocolates

2

Moderate

20 mins

121

Closest Sum

0

Moderate

30 mins

138

Painters And Boards

3

Moderate

15 mins

68

Sub-array Sums Divisible By K

2

Moderate

25 mins

46

Kth largest element in the unsorted array

7

Moderate

10 mins

1163

Candies

8

Moderate

10 mins

641

Jump Game

16

Moderate

15 mins

729

Longest Bracket

3

Moderate

20 mins

70

Amazing Strings

5

Easy

15 mins

268

Admission in Ninja Gram

6

Easy

15 mins

249

Print Diagonal

1

Moderate

30 mins

45

Normal BST To Balanced BST

6

Moderate

15 mins

1391

Preorder Binary Tree NEW

Easy

17 upvotes

Postorder Binary Tree NEW

Easy

4 upvotes

Merge Intervals NEW

Moderate

70 upvotes

Sliding Maximum NEW

Moderate

13 upvotes

Symmetric Tree NEW

Easy

19 upvotes

Implementation: HashMap NEW

Easy

63 upvotes

Valid String NEW

Moderate

29 upvotes

LRU Cache Implementation NEW

Moderate

26 upvotes

Decode String NEW

Easy

6 upvotes

Best Time to Buy and Sell NEW

Moderate

8 upvotes

Maximum Width In Binary Tree NEW

Moderate

11 upvotes

Boundary Traversal of Binary Tree NEW

Hard

79 upvotes

Container With Most Water NEW

Moderate

35 upvotes

Boxes Of Chocolates NEW

Moderate

2 upvotes

Closest Sum NEW

Moderate

0 upvotes

Painters And Boards NEW

Moderate

3 upvotes

Sub-array Sums Divisible By K NEW

Moderate

2 upvotes

Kth largest element in the unsorted array NEW

Moderate

7 upvotes

Candies NEW

Moderate

8 upvotes

Jump Game NEW

Moderate

16 upvotes

Longest Bracket NEW

Moderate

3 upvotes

Amazing Strings NEW

Easy

5 upvotes

Admission in Ninja Gram NEW

Easy

6 upvotes

Print Diagonal NEW

Moderate

1 upvote

Normal BST To Balanced BST NEW

Moderate

6 upvotes

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