Strings are an integral part of coding interviews for placements. We have created a guide featuring top-string interview questions to strengthen the foundation of string and data structures to bring you a step closer to your dream job.

Problem Title

Difficulty

Avg Time to solve

Attempted

Palindromic Substrings

20

Moderate

20 mins

412

Edit Distance

31

Moderate

30 mins

4797

Decode String

6

Easy

15 mins

95

Reverse Words In A String

79

Easy

10 mins

3366

Wildcard Pattern Matching

79

Hard

50 mins

4424

Longest Substring Without Repeating Characters

18

Moderate

20 mins

1168

Longest Palindromic Substring

35

Easy

20 mins

1663

Valid Parentheses

48

Easy

10 mins

8911

Palindrome Partitioning

14

Moderate

25 mins

1144

Longest Palindromic Subsequence

13

Hard

45 mins

1492

Palindrome Partitioning ll

13

Hard

40 mins

1901

Find All Anagrams in a String

4

Easy

15 mins

294

Implement strStr()

1

Moderate

25 mins

283

Roman Numeral To Integer

16

Easy

15 mins

900

Generate Parentheses

8

Easy

10 mins

705

Multiply Strings

22

Moderate

35 mins

1126

First unique character in a string

0

Moderate

15 mins

141

Letter Combinations of a Phone Number

7

Moderate

35 mins

803

Minimum insertions to make a string palindrome

0

Moderate

30 mins

1955

Group Anagrams Together

0

Moderate

-

113

Restore IP Addresses

13

Moderate

15 mins

482

Compare Version Numbers

23

Easy

10 mins

1524

Longest Common Subsequence

3

Moderate

-

991

Longest Valid Parentheses

5

Moderate

10 mins

258

Justify Text

7

Hard

35 mins

97

Palindromic Substrings NEW

Moderate

20 upvotes

Edit Distance NEW

Moderate

31 upvotes

Decode String NEW

Easy

6 upvotes

Reverse Words In A String NEW

Easy

79 upvotes

Wildcard Pattern Matching NEW

Hard

79 upvotes

Longest Substring Without Repeating Characters NEW

Moderate

18 upvotes

Longest Palindromic Substring NEW

Easy

35 upvotes

Valid Parentheses NEW

Easy

48 upvotes

Palindrome Partitioning NEW

Moderate

14 upvotes

Longest Palindromic Subsequence NEW

Hard

13 upvotes

Palindrome Partitioning ll NEW

Hard

13 upvotes

Find All Anagrams in a String NEW

Easy

4 upvotes

Implement strStr() NEW

Moderate

1 upvote

Roman Numeral To Integer NEW

Easy

16 upvotes

Generate Parentheses NEW

Easy

8 upvotes

Multiply Strings NEW

Moderate

22 upvotes

First unique character in a string NEW

Moderate

0 upvotes

Letter Combinations of a Phone Number NEW

Moderate

7 upvotes

Minimum insertions to make a string palindrome NEW

Moderate

0 upvotes

Group Anagrams Together NEW

Moderate

0 upvotes

Restore IP Addresses NEW

Moderate

13 upvotes

Compare Version Numbers NEW

Easy

23 upvotes

Longest Common Subsequence NEW

Moderate

3 upvotes

Longest Valid Parentheses NEW

Moderate

5 upvotes

Justify Text NEW

Hard

7 upvotes

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