Message on Whatsapp 8879355057 for DSA(OA + Interview) + Fullstack Dev Training + 1-1 Personalized Mentoring to get 10+LPA Job
0 like 0 dislike
2,134 views
in Online Assessments by Expert (111,530 points) | 2,134 views

1 Answer

0 like 0 dislike
Best answer

Given a string of 1’s and 2’s, standing at index ‘i’, you can move exactly two steps forward or backward if s[i]==2 , else you can move one step forward or backward if s[i] ==1. A string is called a good string if you can reach the end of the string by moving every index exactly once.

Now, you have been given two Strings A and B (not necessarily good), you have to return the number of possible sub-sequences of swaps available, such that both the strings become good.

Swap means you can swap A[i] with B[i].

Example:

A = 2211 B = 1111 ans = 8

 N<=10^3

by Expert (111,530 points)

Get best answers to any doubt/query/question related to programming , jobs, gate, internships and tech-companies. Feel free to ask a question and you will receive the best advice/suggestion related to anything you ask about software-engineering , development and programming problems .