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

4

Easy

10 mins

100

Postorder Binary Tree

1

Easy

15 mins

58

Merge Intervals

16

Moderate

20 mins

298

Sliding Maximum

10

Moderate

25 mins

231

Tree Symmetricity

4

Easy

20 mins

286

Implementation: HashMap

38

Easy

30 mins

159

Valid String

16

Moderate

18 mins

170

LRU Cache Implementation

11

Moderate

25 mins

167

Decode String

0

Easy

15 mins

20

Best Time to Buy and Sell

6

Moderate

20 mins

107

Maximum Width In Binary Tree

6

Moderate

38 mins

239

Boundary Traversal

28

Hard

20 mins

422

Container With Most Water

22

Moderate

15 mins

147

Boxes Of Chocolates

1

Moderate

20 mins

81

Closest Sum

0

Moderate

30 mins

49

Painters And Boards

1

Moderate

15 mins

24

Sub-array Sums Divisible By K

2

Moderate

25 mins

34

Kth largest element in the unsorted array

4

Moderate

10 mins

207

Candies

6

Moderate

10 mins

167

Jump Game

8

Moderate

15 mins

270

Longest Bracket

2

Moderate

20 mins

51

Amazing Strings

4

Easy

15 mins

229

Admission in Ninja Gram

5

Easy

15 mins

207

Print Diagonal

1

Moderate

30 mins

35

Normal BST To Balanced BST

1

Moderate

15 mins

23

Preorder Binary Tree NEW

Easy

4 upvotes

Postorder Binary Tree NEW

Easy

1 upvote

Merge Intervals NEW

Moderate

16 upvotes

Sliding Maximum NEW

Moderate

10 upvotes

Tree Symmetricity NEW

Easy

4 upvotes

Implementation: HashMap NEW

Easy

38 upvotes

Valid String NEW

Moderate

16 upvotes

LRU Cache Implementation NEW

Moderate

11 upvotes

Decode String NEW

Easy

0 upvotes

Best Time to Buy and Sell NEW

Moderate

6 upvotes

Maximum Width In Binary Tree NEW

Moderate

6 upvotes

Boundary Traversal NEW

Hard

28 upvotes

Container With Most Water NEW

Moderate

22 upvotes

Boxes Of Chocolates NEW

Moderate

1 upvote

Closest Sum NEW

Moderate

0 upvotes

Painters And Boards NEW

Moderate

1 upvote

Sub-array Sums Divisible By K NEW

Moderate

2 upvotes

Kth largest element in the unsorted array NEW

Moderate

4 upvotes

Candies NEW

Moderate

6 upvotes

Jump Game NEW

Moderate

8 upvotes

Longest Bracket NEW

Moderate

2 upvotes

Amazing Strings NEW

Easy

4 upvotes

Admission in Ninja Gram NEW

Easy

5 upvotes

Print Diagonal NEW

Moderate

1 upvote

Normal BST To Balanced BST NEW

Moderate

1 upvote

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