The tasks for week 7 are as follows:
Week problem: 11631 Dark Roads
Weekend problem: 10048 Audiophobia
Suggested bonus: 10600 ACM Contest and Blackout
Read up on minimum spanning trees.
You must submit your solutions on http://uva.onlinejudge.org/
You can browse to these problems from the online judge website by clicking on Browse Problems, Contest Volumes, and then selecting the contest volume as indicated above.