can I use strstr() here? If is yes then what’s wrong in the code.
I think you misunderstood the question. The question asks you to find whether string M is a subsequence (not substring) of string W or W is subsequence of M.
And strstr() is used to find the whether one string is a substring of another string or not. Check here .
Hope this clears your doubt.
Happy Coding !!!
Thank You.