Longest Common Subsequence Problem Statement

Given two strings STR1 and STR2, determine the length of their longest common subsequence.

A subsequence is a sequence that can be derived from another sequence by deleting some or no elements without changing the order of the remaining elements. A common subsequence is one that appears in both strings.

Input:

The first line contains an integer T denoting the number of test cases. Each test case consists of two space-separated strings STR1 and STR2.

Output:

Print the length of the longest common subsequence for each test case on a separate line.

Example:

Input:
STR1 = "abcde", STR2 = "ace"
Output:
3
Explanation:

The longest common subsequence is "ace", which has a length of 3.

Constraints:

  • 1 <= T <= 50
  • 1 <= |STR1| <= 10^2
  • 1 <= |STR2| <= 10^2
  • Time Limit: 1 sec

Note:

You are required to implement the function. Printing of results will be handled elsewhere.

AnswerBot
4mo

The problem involves finding the length of the longest common subsequence between two given strings.

  • Use dynamic programming to solve the problem efficiently.

  • Create a 2D array to store the lengths of c...read more

Help your peers!
Select
Add answer anonymously...

Josh Technology Group Software Developer interview questions & answers

A Software Developer was asked 9mo agoQ. Given the head of a linked list, determine if the linked list has a cycle in it....read more
A Software Developer was asked 9mo agoQ. Given a binary tree, imagine yourself standing on the left side of it, return th...read more
A Software Developer was asked 11mo agoQ. What is the software development life cycle, and what steps does it involve?

Popular interview questions of Software Developer

A Software Developer was asked 9mo agoQ1. Given the head of a linked list, determine if the linked list has a cycle in it....read more
A Software Developer was asked 9mo agoQ2. Given a binary tree, imagine yourself standing on the left side of it, return th...read more
A Software Developer was asked 11mo agoQ3. What is the software development life cycle, and what steps does it involve?
Josh Technology Group Software Developer Interview Questions
Stay ahead in your career. Get AmbitionBox app
play-icon
play-icon
qr-code
Trusted by over 1.5 Crore job seekers to find their right fit company
80 L+

Reviews

10L+

Interviews

4 Cr+

Salaries

1.5 Cr+

Users

Contribute to help millions

Made with ❤️ in India. Trademarks belong to their respective owners. All rights reserved © 2025 Info Edge (India) Ltd.

Follow Us
  • Youtube
  • Instagram
  • LinkedIn
  • Facebook
  • Twitter
Profile Image
Hello, Guest
AmbitionBox Employee Choice Awards 2025
Winners announced!
awards-icon
Contribute to help millions!
Write a review
Write a review
Share interview
Share interview
Contribute salary
Contribute salary
Add office photos
Add office photos
Add office benefits
Add office benefits