I'm not sure if I came to the right place/forum to ask this question, but I have a programming assignment and I need help on one of the question. It's part of the Peking University's online judge questions. It shouldn't be hard for people who understand it. Link: http://poj.org/problem?id=1005 The question is unclear and confusing. I don't understand the problem. The lost land forms a semi-circle, but I don't know if it increasing and it doesn't specify what rate. Is the semi-circle increasing at a specific rate? I understand the input and output part, but how am I supposed to calculate if the points are in the semi-circle without knowing it's growth rate? I don't have any code as I haven't tried it yet because I don't understand. I feel like I'm missing something.