Top String Coding Interview Questions
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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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