Top 50 Google String LeetCode Questions (2026) – Frequently Asked | HackMNC Blog

Most Asked String LeetCode Questions in Google Interviews

String problems are a core part of Google software engineering interviews. These questions often test your ability to manipulate text efficiently and apply optimized approaches.

Many problems involve techniques like sliding window, hashing, and two pointers, making strings one of the most versatile topics in coding interviews.

In this guide, we have compiled some of the most frequently asked String problems reported in Google interviews. Each question includes its difficulty level, interview frequency, and a direct link to the LeetCode problem so that you can start practicing immediately.

Below is a curated list of String LeetCode questions asked in Google interviews.

Sl.No	Question	Difficulty	Frequency	LeetCode Link
1	Longest Substring Without Repeating Characters	MEDIUM	82.60%	Solve
2	Group Anagrams	MEDIUM	78.90%	Solve
3	Valid Parentheses	EASY	77.70%	Solve
4	Longest Palindromic Substring	MEDIUM	77.10%	Solve
5	Merge Strings Alternately	EASY	75.00%	Solve
6	Longest Common Prefix	EASY	70.80%	Solve
7	Generate Parentheses	MEDIUM	68.60%	Solve
8	Letter Combinations of a Phone Number	MEDIUM	68.20%	Solve
9	Roman to Integer	EASY	66.10%	Solve
10	Word Search	MEDIUM	63.60%	Solve
11	Word Break	MEDIUM	60.60%	Solve
12	Reverse Words in a String	MEDIUM	59.50%	Solve
13	Valid Palindrome	EASY	59.30%	Solve
14	Regular Expression Matching	HARD	56.10%	Solve
15	Minimum Window Substring	HARD	54.80%	Solve
16	Word Break II	HARD	53.30%	Solve
17	Find the Index of the First Occurrence in a String	EASY	52.80%	Solve
18	Zigzag Conversion	MEDIUM	52.80%	Solve
19	Integer to Roman	MEDIUM	52.20%	Solve
20	Rank Teams by Votes	MEDIUM	51.60%	Solve
21	Valid Anagram	EASY	51.40%	Solve
22	Move Pieces to Obtain a String	MEDIUM	50.00%	Solve
23	Longest Valid Parentheses	HARD	48.70%	Solve
24	String to Integer (atoi)	MEDIUM	46.60%	Solve
25	String Transformation	HARD	46.20%	Solve
26	Edit Distance	MEDIUM	45.70%	Solve
27	Add Binary	EASY	45.70%	Solve
28	Decode Ways	MEDIUM	45.30%	Solve
29	Simplify Path	MEDIUM	45.30%	Solve
30	Word Ladder	HARD	44.80%	Solve
31	Length of Last Word	EASY	43.20%	Solve
32	Isomorphic Strings	EASY	43.10%	Solve
33	Wildcard Matching	HARD	41.60%	Solve
34	Count and Say	MEDIUM	40.40%	Solve
35	Expressive Words	MEDIUM	39.80%	Solve
36	Shortest Palindrome	HARD	38.00%	Solve
37	Number of Substrings Containing All Three Characters	MEDIUM	37.90%	Solve
38	First Unique Character in a String	EASY	37.90%	Solve
39	Multiply Strings	MEDIUM	37.60%	Solve
40	Sentence Screen Fitting	MEDIUM	37.50%	Solve
41	Lexicographically Smallest Beautiful String	HARD	37.50%	Solve
42	Unique Length-3 Palindromic Subsequences	MEDIUM	37.50%	Solve
43	Maximum Score After Splitting a String	EASY	37.50%	Solve
44	Find Longest Special Substring That Occurs Thrice I	MEDIUM	37.50%	Solve
45	Minimum Number of Operations to Move All Balls to Each Box	MEDIUM	37.50%	Solve
46	Sender With Largest Word Count	MEDIUM	37.50%	Solve
47	Valid Word Abbreviation	EASY	37.50%	Solve
48	Text Justification	HARD	36.90%	Solve
49	Group Shifted Strings	MEDIUM	35.40%	Solve
50	Word Search II	HARD	34.70%	Solve

You can also track your progress and practice these questions using our tool:
Google LeetCode Interview Questions Tracker

How to Prepare for String Questions in Google Interviews

To perform well in Google coding interviews, it’s important to develop strong skills in string manipulation and pattern recognition.

Some useful preparation strategies include:

Practicing sliding window techniques for substring problems
Using hash maps for character frequency counting
Solving problems involving palindromes and pattern matching
Understanding two pointer approaches for string traversal
Optimizing brute-force solutions using efficient string operations

Mastering string problems will significantly improve your problem-solving speed and coding confidence.

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