Software engineering is a collaborative activity. Throughout the course, you are encouraged to work with others, to share ideas and collaborate in problem sharing, except on those tasks where individual work is explicitly required. However, you are expected to follow professional practice and give proper attribution to all contributors.
To make use of the expertise of others and to build on previous work, with proper attribution, is good professional practice. To use the efforts of others without attribution is professionally unethical and academically is plagiarism or cheating.
All students should be familiar with Cornell's policy on academic integrity: The Code of Academic Integrity.