E. Runaway to a Shadow 题目连接: http://www.codeforces.com/contest/681/problem/E Description Dima is living in a dormitory, as well as some cockroaches. At the moment 0 Dima saw a cockroach running on a table and decided to kill it. Dima needs exactly T…

D. Gifts by the List 题目连接: http://www.codeforces.com/contest/681/problem/D Description Sasha lives in a big happy family. At the Man's Day all the men of the family gather to celebrate it following their own traditions. There are n men in Sasha's fam…

C. Heap Operations 题目连接: http://www.codeforces.com/contest/681/problem/C Description Petya has recently learned data structure named "Binary heap". The heap he is now operating with allows the following operations: put the given number into the…

B. Economy Game 题目连接: http://www.codeforces.com/contest/681/problem/B Description Kolya is developing an economy simulator game. His most favourite part of the development process is in-game testing. Once he was entertained by the testing so much, th…

A. A Good Contest 题目连接: http://www.codeforces.com/contest/681/problem/A Description Codeforces user' handle color depends on his rating - it is red if his rating is greater or equal to 2400; it is orange if his rating is less than 2400 but greater or…

A. A Good Contest time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Codeforces user' handle color depends on his rating — it is red if his rating is greater or equal to 2400; it is orange if…

传说中做cf不补题等于没做 于是第一次补...这次的cf没有做出来DE D题的描述神奇 到现在也没有看懂 于是只补了E 每次div2都是hack前2~3题 终于打出一次hack后的三题了...希望以后能越来越好 早日..至少变成蓝色名字吧:) E题意 有一个蟑螂 人要打死它 给出蟑螂的坐标 速度 人的瞄准时间 再给出一些阴影(圆形且给出坐标与半径) 若蟑螂移动到阴影内会立即停下 人不能打到阴影中的蟑螂 问它不被打死的机率 蟑螂的移动方向是随机的 需要注意的是蟑螂只会朝一个方向走直线 所以我们对于…

C. Heap Operations time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Petya has recently learned data structure named "Binary heap". The heap he is now operating with allows the following…

C. Heap Operations time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Petya has recently learned data structure named "Binary heap". The heap he is now operating with allows the following…

B. Economy Game time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Kolya is developing an economy simulator game. His most favourite part of the development process is in-game testing. Once he…