Here are two submission — Accepted_one || Compilation_error_one. I don't understand why strstr is behaving different in those two solutions?
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strstr doesn't work with C++ strings. This has nothing to do with bits/stdc++.h.
then why did it work in the first submission??
Because you didn't used any C++ style strings. Only C style strings, aka char arrays.
It's because a C++ string is not equivalent to a character array (C style String). Your code works fine when using a char array instead 40550976.It gives a error as compiler cannot implicitly covert c++ string into a char array. To construct C string out of a string c_str method is used. Difference bw c and c++ style string .