This is a team contest. Until the contest is over, you may not communicate, publicly or privately, with anyone other than your teammates and the contest organisers, in a way that could help you or any other team to solve the tasks.
Unless it breaks the communication rule, you may use any means or resources to solve the tasks, e.g. the internet, calculators, software, books and notes.
CPMSoc reserves the right to disqualify a participant (and possibly take further action) for any reason, such as abusing the contest system.