Help me in this project of C++

Question

Sololearn has made a project called 'transportation' in C++ in which we have to use module operator but I think that my code is correct and should be accepted by sololearn as correct too

https://code.sololearn.com/cdVi5DwDXo6T/?ref=app

Answer 1

For input 234, the 34 is the passengers in the last bus to be filled in seats.. It is asked to find empty seats then..