摘要：
There are two types of burgers in your restaurant — hamburgers and chicken burgers! To assemble a hamburger you need two buns and a beef patty. To ass 阅读全文
摘要：
Polycarp analyzes the prices of the new berPhone. At his disposal are the prices for nn last days: a1,a2,…,ana1,a2,…,an, where aiai is the price of be 阅读全文
摘要：
You are given nn chips on a number line. The ii-th chip is placed at the integer coordinate xixi. Some chips can have equal coordinates. You can perfo 阅读全文