摘要：
Edward has an array A with N integers. He defines the beauty of an array as the summation of all distinct integers in the array. Now Edward wants to k 阅读全文
摘要：
In computer security, Capture the Flag (CTF) is a computer security competition. CTF contests are usually designed to serve as an educational exercise 阅读全文
摘要：
Vova has won nn trophies in different competitions. Each trophy is either golden or silver. The trophies are arranged in a row. The beauty of the arra 阅读全文