传送门 分析 我们考虑用所有的情况减去不合法的情况 不难想出所有情况为$C_n^3$ 于是我们考虑不合法的情况 我们知道对于一个不合法的三元组$(a,b,c)$一定是修改后$a<b,b>c$ 于是我们可以离散化后用线段树维护每个点被覆盖了几次 所以每次对于一个点$i$,比它大的点的个数即为在它前面修改次数为偶数的数量加在它后面修改次数为奇数的数量 而产生的不合法情况即为$C_{sum_i}^2$ 我们再统计前后两种情况的时候将修改排序然后分别从后往前和从前往后各跑一次即可 每次只要区间不再覆盖…

Discription Farmer John is hosting a tennis tournament with his n cows. Each cow has a skill level si, and no two cows having the same skill level. Every cow plays every other cow exactly once in the tournament, and each cow beats every cow with skil…

A. Tennis Tournament time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output A tennis tournament with n participants is running. The participants are playing by an olympic system, so the winners mo…

CF 628A 题目大意:给定n,b,p,其中n为进行比赛的人数,b为每场进行比赛的每一位运动员需要的水的数量, p为整个赛程提供给每位运动员的毛巾数量, 每次在剩余的n人数中,挑选2^k=m(m <=n)个人进行比赛,剩余的n-m个人直接晋级, 直至只剩一人为止,问总共需要的水的数量和毛巾的数量 解题思路:毛巾数很简单: n*p即可 水的数量:1,2,4,8,16,32,64,128,256,512,提前打成一个表, 根据当前剩余的人数n在表中二分查找最大的小于等于n的数,结果即为本次进行比赛…

A. Tennis Tournament 题目连接: http://www.codeforces.com/contest/628/problem/A Description A tennis tournament with n participants is running. The participants are playing by an olympic system, so the winners move on and the losers drop out. The tourname…

大致题意: 网球比赛,n个參赛者,每场比赛每位选手b瓶水+裁判1瓶水,所有比赛每一个參赛者p条毛巾 每一轮比赛有2^k个人參加比赛(k为2^k<=n中k的最大值),下一轮晋级人数是本轮每场比赛的获胜者,还得加上n-k个人 求全部比赛完毕后所须要的水的数量和毛巾的数量 注: 如有疑问,请下方评论,本人一定具体解答 #include <bits/stdc++.h> using namespace std; int main() { int n,b,p; while(~scanf("…

A. Cows and Primitive Roots 暴力. B. Cows and Poker Game 模拟. C. Cows and Sequence 线段树维护. D. Cow Program 除1的位置\(a_x\)都是固定的,也就说当前位置\(x\)最终的位置也是确定的. 只要判断最后\(x\)超出范围,或者在环中,或者走回1这三种情况. 当前信息需要记录位置\(x\)以及方向\(d\),判断状态是否在环中可以使用时间戳,若在环中,显然时间戳应该是一样的. E. Coin Trou…

C. Tennis Championship 题目链接 http://codeforces.com/contest/735/problem/C 题面 Famous Brazil city Rio de Janeiro holds a tennis tournament and Ostap Bender doesn't want to miss this event. There will be n players participating, and the tournament will fo…

C. Tennis Championship time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Famous Brazil city Rio de Janeiro holds a tennis tournament and Ostap Bender doesn't want to miss this event. There w…

Tennis Championship time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Famous Brazil city Rio de Janeiro holds a tennis tournament and Ostap Bender doesn't want to miss this event. There will…