Balls and Boxes                                                                            Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)                                                                            …

题目链接: Balls and Boxes Time Limit: 2000/1000 MS (Java/Others)     Memory Limit: 65536/65536 K (Java/Others) Problem Description Mr. Chopsticks is interested in random phenomena, and he conducts an experiment to study randomness. In the experiment, he…

 Balls and Boxes(盒子与球) Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others) Description 题目描述 Mr. Chopsticks is interested in random phenomena, and he conducts an experiment to study randomness. In the experiment, he thr…

C. Balls and Boxes time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Little Vasya had n boxes with balls in the room. The boxes stood in a row and were numbered with numbers from 1 to n from…

Balls and Boxes 题目链接: http://acm.hdu.edu.cn/showproblem.php?pid=5810 Description Mr. Chopsticks is interested in random phenomena, and he conducts an experiment to study randomness. In the experiment, he throws n balls into m boxes in such a manner t…

Balls and Boxes 题目连接: http://acm.hdu.edu.cn/showproblem.php?pid=5810 Description Mr. Chopsticks is interested in random phenomena, and he conducts an experiment to study randomness. In the experiment, he throws n balls into m boxes in such a manner t…

260C - Balls and Boxes 思路:模拟.在x前面找到最小值,如果没有,从0跳到n,继续找到最小值,边找最小值路过的点边减1.然后所有值都减去最小值,最小值那个点加上减去的值. 找到x前面离x最近的最小值的原因:如果如果在x到最小值之间还有最小值,那么这个最小值最后会变成-1. 简单代码: #include<bits/stdc++.h> using namespace std; #define ll long long ; const ll INF=0x7f7f7f7f; ll…

Balls and Boxes Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 260    Accepted Submission(s): 187 Problem Description Mr. Chopsticks is interested in random phenomena, and he conducts an experi…

Mr. Chopsticks is interested in random phenomena, and he conducts an experiment to study randomness. In the experiment, he throws n balls into m boxes in such a manner that each ball has equal probability of going to each boxes. After the experiment,…

1.打表找规律,下面是打表程序: #include <iostream> #include <cstdio> #define ll long long #define N 100005 using namespace std; ll n,m,b[N],ans,num; ll sqr(ll x) { return x*x; } void dfs(ll r){ if(r==0){ num++; for(int i=1;i<=m;i++) ans+=sqr(b[i]); retur…

n*(m-1)/(m*m) #pragma comment(linker, "/STACK:1024000000,1024000000") #include<cstdio> #include<cstring> #include<cmath> #include<algorithm> #include<vector> #include<map> #include<set> #include<queue…

这题似乎就是纯概率论.. E(V)=D(X_i)=npq (p=1/m,p+q=1) #include<bits/stdc++.h> using namespace std; typedef long long LL; LL n,m; LL gcd(LL a,LL b) { return b?gcd(b,a%b):a; } int main() { while(cin>>n>>m && n+m) { LL a=n*m-n,b=m*m; LL g=gcd(…

官方题解看不太懂,参考了一些人的博客以后自己证明如下: 其中D(X)和E(X)的公式如下(参考自百度百科): 其中 p = 1 / m .(这是每一个单独事件发生的概率期望,在这里单独事件指的是一个球放到m个盒子里面,放到每个盒子里面的概率都是一样的,所以期望都是1 / m了) 推出了公式以后,代码就很好写了.代码如下: #include <stdio.h> #include <algorithm> #include <string.h> using namespace…

题目链接 这题似乎就是纯概率论.. E(V)=D(X_i)=npq (p=1/m,p+q=1) #include<bits/stdc++.h> using namespace std; typedef long long LL; LL n,m; LL gcd(LL a,LL b) { return b?gcd(b,a%b):a; } int main() { while(cin>>n>>m && n+m) { LL a=n*m-n,b=m*m; LL g…

D. Boxes And Balls time limit per test2 seconds memory limit per test256 megabytes 题目链接:http://codeforces.com/contest/884/problem/D Description Ivan has n different boxes. The first of them contains some balls of n different colors. Ivan wants to pla…

Ivan has n different boxes. The first of them contains some balls of n different colors. Ivan wants to play a strange game. He wants to distribute the balls into boxes in such a way that for every i (1 ≤ i ≤ n) i-th box will contain all balls with co…

问题 D: Segment Balls 时间限制: 1 Sec  内存限制: 128 MB 提交: 253  解决: 37 题目描述 Small K has recently earn money in stock market , so he want to make balls to celebrate it. Now he buys so many balls , and he want to put it into the boxes , he will have two operato…

A. Adding Digits 枚举. B. Ancient Prophesy 字符串处理. C. Balls and Boxes 枚举起始位置\(i\),显然\(a_i \le a_j, 1 \le j \le n\), 同时\(i+1\)到\(x\)之间数需要大于\(a_i\),那么只要处理下区间最值即可. D. Black and White Tree 当\(s_i\)是最小值时,点\(i\)是个叶子节点,那么在不同颜色中的集合中找另一点连接即可. E. Dividing Kingdom…

6/12 2016 Multi-University Training Contest 7 期望 B Balls and Boxes(BH) 题意: n个球放到m个盒子里,xi表示第i个盒子里的球的数量,求V的期望值. 思路: 官方题解: 代码: #include <bits/stdc++.h> typedef long long ll; ll GCD(ll a, ll b) { return b ? GCD (b, a % b) : a; } int main() { ll n, m; wh…

Ball 题目链接: http://acm.hdu.edu.cn/showproblem.php?pid=5821 Description ZZX has a sequence of boxes numbered 1,2,...,n. Each box can contain at most one ball. You are given the initial configuration of the balls. For 1≤i≤n, if the i-th box is empty the…

A Money , money 时间限制: 1 Sec  内存限制: 128 MB 提交: 15  解决: 14 题目描述 Small K seen recently stock market really too violent, so he want to choose some ways to earn money. At every month, he can use three ways to manage his money . For example , if he has 100…

ZZX has a sequence of boxes numbered 1,2,...,n1,2,...,n. Each box can contain at most one ball. You are given the initial configuration of the balls. For 1≤i≤n1≤i≤n, if the ii-th box is empty then a[i]=0a[i]=0, otherwise the i-th box contains exactly…

Ball 题目连接: http://acm.hdu.edu.cn/showproblem.php?pid=5821 Description ZZX has a sequence of boxes numbered 1,2,...,n. Each box can contain at most one ball. You are given the initial configuration of the balls. For 1≤i≤n, if the i-th box is empty the…

hackerrankWeek of Code 32 A.Duplication B.Fight the Monsters! C.Circular Walk D.Geometric Trick E.Balls and Boxes F.Special Substrings…

Ants 首先求出每个点的最近点. 可以直接对所有点构造kd树,然后在kd树上查询除本身以外的最近点,因为对所有点都求一次,所以不用担心退化. 也可以用分治做,同样是O(NlogN)的复杂度. 方法是每次用一条竖直线将平面划分成左右两半(平行线划分上下两半也可以),对两半中的点分别递归求每个点的最近点. 然后对左半边的一个点p,如果以它到左半边的最近点的距离为半径画出来的圆和右半边相交,则需要判断右半边是否有距离p更近的点. 我们求出这些圆和竖直平分线的交点,并将右半边的点投影到竖直平分线上,显…

1.Combinatorial Mathematics 1.1 Bell Number: \(B_n\)表示元素个数为n的集合划分成若干个不相交集合的方案数. \(B_{n + 1} = \sum_{k = 0}^n C(n,k)B_k\). 1.2 Catalan Number: 递推公式: \(h_1 = 1, h_n = \frac{h_{n-1}(4n-2)}{n+1}\). 组合数公式:\(h_n = \frac{C(2n,2)}{n +1} = C(2n,n) - C(2n,n+1)…

Ball Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 461    Accepted Submission(s): 273 Problem Description , otherwise the i-th box contains exactly one ball, the color of which is a[i], a posi…

[CF884D]Boxes And Balls 题意:有n个箱子和若干个球,球的颜色也是1-n,有ai个球颜色为i,一开始所有的球都在1号箱子里,你每次可以进行如下操作: 选择1个箱子,将里面所有的球拿出来,分成k部分(你可以令k=2或3),将每一部分都放到一个空箱子中.花费的代价是这个箱子中球的总数. 现要求你在若干次操作后,所有颜色为i的球都在i号箱子里,求最小代价. n<=200000,ai<=10^9 题解:傻逼题都不会做了.将操作反过来,就变成了将k个箱子合并到一起,这就变成经典的哈…

Description Mr. Mindless has many balls and many boxes,he wants to put all the balls into some of the boxes.Now, he wants to know how many different solutions he can have. you know,he could put all the balls in one box,and there could be no balls in…

Description Mr. Mindless has many balls and many boxes,he wants to put all the balls into some of the boxes.Now, he wants to know how many different solutions he can have. you know,he could put all the balls in one box,and there could be no balls in…