The error that impressed me most is a bug in one of my project,We were doing a project using DP,the implementation of one of the DP-decorator is not completely consistent with the way it should be.
The way I found it was that my teacher pointed it out when I was presenting my code to him.
It might be the reason that people learn most from their failure,so that error still has a strong impression upon me,
It doesn't have a severe impact because we somehow bypassed that piece of code but still got things work,you won't probably find it is wrong until you carefully compare the structure of that code with the graph.