Fastenal Quality Analyst interview questions

I got an friendly interviewer he asked me very basic questions and he was so friendly one of the main reasons i wasnt tensed was him he started with asking what is an undirected weighted graph is and then he asked me to find the minimum spanning tree given a undirected weighted graph and then he asked by everything about oops and then he asked about keywords in cpp like volatile friend functions virtual functions and then later on we got into some discussions and then he suggested me some of my drawbacks to improve and then it ended nice. and then later i was called for the hr round basic hr interview questions and then they offered me job.