CSX Information Technology Development Program interview questions

After shortlisting my profile, I was asked to visit the Headoffice for coding interview. There I was given 7 questions to code and I successfully executed 6 Programs while in the 7th question, only 6 out of 17 test cases passed. I scored 230/250 and was shortlisted for Managerial interview. Everything went well and I was very confident of getting an offer from CSX. But after 2 weeks, I was told that we don't provide sponsorship so we can't take you. I was really disappointed as I was not informed about this condition at the start.