Matrix54: My Blog

Problem Statement  TopCoder Security Agency (TSA, established today) is going to search for dangerous content in the internet.There are N candidate websites numbered 0 through N-1. Each

Problem Statement  Magical Girl Iris loves perfect squares. A positive integer n is a perfect square if and only if there is a positive integer b >= 1 such that b*b = n. For example, 1 (=1*1

Problem Statement  Magical Girls are girls who have magical powers. They fight against evil to protect the Earth. Cosmic enemies have just attacked the Earth, and the Magical Girls are going