也许今年不该参赛的.... 因为暑假才刚刚调整好心态... 上学期基本废掉了... 感觉就是虚得不行，什么都不会的感觉.... ．．． 倒是每天做题都能把自己搞得excited 大概越是弱的人越容易exicted吧．

D. Three Logos time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Three companies decided to order a billboard with pictures of their logos. A billboard is a big square board. A logo of each company is a rectangle of a non-zero area. Advertisers will put up the …

Desiderium **Time Limit: 4000/2000 MS (Java/Others) Memory Limit: 65536/65536 K (Java/Others) Total Submission(s): 427 Accepted Submission(s): 167 ** Problem Description There is a set of intervals, the size of this set is n. If we select a subset of this set with equal probability, how many the expected length of …

time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Petya loves computer games. Finally a game that he's been waiting for so long came out! The main character of this game has n different skills, each of which is characterized by an integer a__i from 0 to 100. …

B. Luxurious Houses time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output The capital of Berland has n multifloor buildings. The architect who built up the capital was very creative, so all the houses were built in one row. Let's enumerate all the houses from left …

A. Vasya the Hipster time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output One day Vasya the Hipster decided to count how many socks he had. It turned out that he had a red socks and b blue socks. According to the latest fashion, hipsters should wear the socks of …

As I work with students I often face the situation when if a problem doesn't seem clear to a student at the first sight, it makes them unable to solve it. Indeed, you always hear about specific methods and techniques. But you don't hear about how to think in order to apply them. In this note I'll try to sum up my …