B. T-Shirt Hunt http://codeforces.com/problemset/problem/807/B time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Not so long ago the Codecraft-17 contest was held on Codeforces. The top 25 p…

B. T-Shirt Hunt time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Not so long ago the Codecraft-17 contest was held on Codeforces. The top 25 participants, and additionally random 25 partici…

http://codeforces.com/problemset/problem/807/C C. Success Rate time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output You are an experienced Codeforces user. Today you found out that during your…

http://codeforces.com/problemset/problem/807/A A. Is it rated? time limit per test              2 seconds memory limit per test        256 megabytes input       standard input output standard output Is it rated? Here it is. The Ultimate Question of C…

题目链接:http://codeforces.com/contest/807/problem/E 题意:已知每个数都能用x=1 + 2 + 4 + ... + 2k - 1 + r (k ≥ 0, 0 < r ≤ 2k)来表示, 给出一串数字问这串数字能有几个x表示.输出可能的长度. 题解:这题比较巧妙具体还是看代码理解一下,不好解释. #include <iostream> #include <cstring> #include <vector> #includ…

题目链接:http://codeforces.com/contest/807/problem/D 题意:对于动态计分的 Codeforces Round ,已知每题的 score 是根据 Round 参加人数和该题过题人数计算,两者之比结合上图得出该题的分数.某人在该题的得分为 score*(1−t/250) 其中 t 表示通过该题的时间. 已知参加该场比赛的所有参加者的过题情况(包括 Vasya 和 Petya),问如何通过增加新的参赛者(尽量少),使得 Vasya 的最终得分高于 Petya…

题目链接:http://codeforces.com/contest/807/problem/C 题意:记 AC 率为当前 AC 提交的数量 x / 总提交量 y .已知最喜欢的 AC 率为 p/q (pq∈[0,1]) . 求最少在提交多少题(AC or NOT)能恰好达到 AC 率为 p/q 题解:当然可以用数学的方法来求解,我的解法并不是用什么数学方法,直接二分暴力就行. 由于(x+s)/(y+s+us)=(p/q)(s表示ac的,us表示没ac的)所以不妨设 x+s=k*p,y+s+us…

[题目链接]:http://codeforces.com/contest/807/problem/B [题意] 你在另外一场已经结束的比赛中有一个排名p; 然后你现在在进行另外一场比赛 然后你当前有一个分数x; 以及另外一个分数y,表示如果要拿第一需要的分数; 你可以通过hack使得分数x大于分数y; 然后你最后的分数x会决定你那个排名p能不能在已经结束的那场比赛中拿到奖品; 问你技能拿到奖品,又能在这场比赛中夺冠;至少需要hack成功多少次(失败的不需要输出); (hack规则和cf的一样)…

After the big birthday party, Katie still wanted Shiro to have some more fun. Later, she came up with a game called treasure hunt. Of course, she invited her best friends Kuro and Shiro to play with her. The three friends are very smart so they passe…

题目描述: Mouse Hunt time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Medicine faculty of Berland State University has just finished their admission campaign. As usual, about 80%of applicants a…