好吧前几天一直没更新博客,主要是更新博客的确是要耗费一点精力 北大教你数水坑 最近更新博客可能就是一点旧的东西和一些水题,主要是最近对汇编感兴趣了嘻嘻嘻 这一题挺简单的,没什么难度,简单深搜 #include <stdio.h> #include <stdlib.h> typedef int Postion; ][]; static int N, M; void DFS(Postion, Postion); int main(void) { ; while (~scanf(&quo…

Lake Counting Time Limit: 1000MS     Memory Limit: 65536K Total Submissions: 17917     Accepted: 9069 Description Due to recent rains, water has pooled in various places in Farmer John's field, which is represented by a rectangle of N x M (1 <= N <=…

题目描述:有一个大小为N*M的园子,八连通的积水被认为是连接在一起的.请求出园子里总共有多少水洼?(八连通指的是下图中相对w的*部分) *** *w* *** 限制条件 N,M<=100 样例 输入: N=10,M=12 园子如下图('w'表示积水,'.'表示没有积水) w . . . . . . . . ww . . www . . . . www . . . . ww . . . ww . . . . . . . . . . . ww . . . . . . . . . . . w . .…

Time limit1000 ms Memory limit65536 kB Due to recent rains, water has pooled in various places in Farmer John's field, which is represented by a rectangle of N x M (1 <= N <= 100; 1 <= M <= 100) squares. Each square contains either water ('W')…

用C++实现图的DFS和BFS(邻接表) 概述   图的储存方式有邻接矩阵和邻接表储存两种.由于邻接表的实现需要用到抽象数据结构里的链表,故稍微麻烦一些.C++自带的STL可以方便的实现List,使算法的实现变得简单起来 算法概述   为了让我们的算法更有普适性,我们将非连通图也考虑在内.其实,要想遍历到类似于图中5,6节点这种孤岛节点,只需要依次按编号遍历顺序所有节点,如果某节点没有访问(book数组标记值为0),则从该节点开始深度优先搜索或广度优先搜索:等一次深搜或广搜完毕后,继续依次按照编…

Lake Counting Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 40370   Accepted: 20015 Description Due to recent rains, water has pooled in various places in Farmer John's field, which is represented by a rectangle of N x M (1 <= N <= 10…

Lake Counting Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 18201   Accepted: 9192 Description Due to recent rains, water has pooled in various places in Farmer John's field, which is represented by a rectangle of N x M (1 <= N <= 100…

-->Lake Counting 直接上中文了 Descriptions: 由于近日阴雨连天,约翰的农场中中积水汇聚成一个个不同的池塘,农场可以用 N x M (1 <= N <= 100; 1 <= M <= 100) 的正方形来表示.农场中的每个格子可以用'W'或者是'.'来分别代表积水或者土地,约翰想知道他的农场中有多少池塘.池塘的定义:一片相互连通的积水.任何一个正方形格子被认为和与它相邻的8个格子相连. 给你约翰农场的航拍图,确定有多少池塘 Input Line 1…

Lake Counting Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 48370 Accepted: 23775 Description Due to recent rains, water has pooled in various places in Farmer John's field, which is represented by a rectangle of N x M (1 <= N <= 100; 1…

来之不易的2017第一发ac http://poj.org/problem?id=2386 Lake Counting Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 31474   Accepted: 15724 Description Due to recent rains, water has pooled in various places in Farmer John's field, which is repr…

Lake Counting Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 49414   Accepted: 24273 Description Due to recent rains, water has pooled in various places in Farmer John's field, which is represented by a rectangle of N x M (1 <= N <= 10…

Ant Counting Time Limit : 2000/1000ms (Java/Other)   Memory Limit : 131072/65536K (Java/Other) Total Submission(s) : 3   Accepted Submission(s) : 2 Problem Description Bessie was poking around the ant hill one day watching the ants march to and fro w…

题目链接:http://vjudge.net/contest/view.action?cid=51369#problem/A   (A - Children of the Candy Corn) http://poj.org/problem?id=2488   (A Knight's Journey) (不知道为什么,名字竟然不同哇~~~~还是poj 改名改得好) 题目意思:给出一个p * q 的棋盘,行用阿拉伯数字1,2,...,p-1, p 来表示,列从大写字母'A'开始表示.我这里为了简化…

Charm Bracelet    POJ 3624 就是一道典型的01背包问题: #include<iostream> #include<stdio.h> #include<algorithm> #include<string.h> using namespace std; ],b[]; ]; int main() { int n,m,i,j; while(scanf("%d%d",&n,&m)!=EOF) { ;i&l…

Description 年轻的探险家来到了一个印第安部落里.在那里他和酋长的女儿相爱了,于是便向酋长去求亲.酋长要他用10000个金币作为聘礼才答应把女儿嫁给他.探险家拿不出这么多金币,便请求酋长降低要求.酋长说:"嗯,如果你能够替我弄到大祭司的皮袄,我可以只要8000金币.如果你能够弄来他的水晶球,那么只要5000金币就行了."探险家就跑到大祭司那里,向他要求皮袄或水晶球,大祭司要他用金币来换,或者替他弄来其他的东西,他可以降低价格.探险家于是又跑到其他地方,其他人也提出了类似的要求…

Scout YYF I Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 5565   Accepted: 1553 Description YYF is a couragous scout. Now he is on a dangerous mission which is to penetrate into the enemy's base. After overcoming a series difficulties,…

取石子游戏 Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 37662   Accepted: 12594 Description 有两堆石子,数量任意,可以不同.游戏开始由两个人轮流取石子.游戏规定,每次有两种不同的取法,一是可以在任意的一堆中取走任意多的石子:二是可以在两堆中同时取走相同数量的石子.最后把石子全部取完者为胜者.现在给出初始的两堆石子的数目,如果轮到你先取,假设双方都采取最好的策略,问最后你是胜者还是败者…

题目:Find The Multiple 题意:求给出的数的倍数,该倍数是只由 1与 0构成的10进制数. 思路:nonzero multiple  非零倍数  啊. 英语弱到爆炸,理解不了题意..... STL 在c++过不了,  一直TLE, 最后只好看了下大神的代码. #include <iostream> #include <algorithm> #include <stdlib.h> #include <time.h> #include <c…

题目:食物链 题意:给定一些关系.判断关系的正确性,后给出的关系服从之前的关系: 思路:难点不在并查集,在于关系的判断,尤其是子节点与根节点的关系的判断: 这个关系看似没给出,但是给出子节点与父节点的关系AND父节点与根节点的关系之后,子节点与根节点的关系是可以确定的. Rank[]存的是与父节点的关系,0是同类,1是被吃,2是吃 1.若Find(x) == Find(y) ,则x y有关系,直接判断关系: 1)  d == 1, Rank[x] == Rank[y] ,  否则fake++:…

Collecting Bugs Time Limit: 10000MS   Memory Limit: 64000K Total Submissions: 3064   Accepted: 1505 Case Time Limit: 2000MS   Special Judge Description Ivan is fond of collecting. Unlike other people who collect post stamps, coins or other material s…

题目大意,给出一个字符串s,求最大的k,使得s能表示成a^k的形式,如 abab 可以表示成(ab)^2: 方法:首先 先求kmp算法求出next数组:如果 len mod (len-next[len])==0 ,答案就是 len /(len-next[len]),否则答案是1:证明如下: 如果s能表示成 a^k的形式且k>1,k尽可能大,即s可以表示成aaaaaa(k个a):那么next[len]就等于k-1个a的长度:aaaaaaa  aaaaaaa那么 (len-next[len])a的长…

传送门 生成函数基础题. 题意:给出nnn个数以及它们的数量,求从所有数中选出i∣i∈[L,R]i|i\in[L,R]i∣i∈[L,R]个数来可能组成的集合的数量. 直接构造生成函数然后乘起来f(x)=∏i=1n(1+x+x2+...+xtimei)f(x)=\prod_{i=1}^n(1+x+x^2+...+x^{time_i})f(x)=∏i=1n​(1+x+x2+...+xtimei​)然后求出系数即可. 由于模数是1e61e61e6无法nttnttntt,考虑到数据很小可以直接用dpdp…

Calculate the number of toys that land in each bin of a partitioned toy box. 计算每一个玩具箱里面玩具的数量 Mom and dad have a problem - their child John never puts his toys away when he is finished playing with them. They gave John a rectangular box to put his toy…

扫描线算是线段树的一个比较特殊的用法,虽然NOIP不一定会考,但是学学还是有用的,况且也不是很难理解. 以前学过一点,不是很透,今天算是搞懂了. 就以这道题为例吧:嘟嘟嘟 题目的意思是在一个二维坐标系中给了很多矩形,然后求这些矩形的总覆盖面积,也就是面积并. 我就不讲暴力,直接切入正题吧. 扫描线,听这个名字就可以想象一下,现在有这么多重叠的矩形,然后有一个线从下往上扫,那么每一时刻这条线上被覆盖的长度之和,就是我们要求的答案. 那么首先可以想到,要把给定的矩形都离线下来,拆成上下来个面,并标记…

题意:给一颗n个节点的树,每条边上有一个距离v(v<=1000).定义d(u,v)为u到v的最小距离.给定k值,求有多少点对(u,v)使u到v的距离小于等于k. /* 照着点分治模板敲了敲,有很多细节地方应该注意,不然很容易出错. 点分治的大概就是解决树上路径中统计某些东西的一个算法,顾名思义,肯定与递归有些关系. 简单步骤就是:①求重心 ②统计这棵树的答案 ③递归到它的子树求解 推荐一篇博客:http://www.cnblogs.com/chty/p/5912360.html */ #incl…

链接:http://poj.org/problem?id=2386 题解 #include<cstdio> #include<stack> using namespace std; ,MAX_N=; char a[MAX_N][MAX_M]; int N,M; //现在位置 (x,y) void dfs(int x,int y){ a[x][y]='.'; //将现在所在位置替换为'.',即旱地 ;dx<=;dx++){ //循环遍历连通的8个方向:上.下.左.右.左上.左下…

Description Due to recent rains, water has pooled in various places in Farmer John's field, which is represented by a rectangle of N x M (1 <= N <= 100; 1 <= M <= 100) squares. Each square contains either water ('W') or dry land ('.'). Farmer…

Description Due to recent rains, water has pooled in various places in Farmer John's field, which is represented by a rectangle of N x M (1 <= N <= 100; 1 <= M <= 100) squares. Each square contains either water ('W') or dry land ('.'). Farmer…

题目链接POJ NO.2386 解题思路: 这个也是一个dfs 的应用,在书上的例子,因为书上的代码并不全,基本都是函数分块来写,通过这个题目也规范了代码,以后能用函数的就都用函数来实现吧.采用深度优先搜索,从任意的w开始,不断把邻接的部分用'.'代替,1次DFS后与初始这个w连接的所有w就全都被替换成'.',因此直到图中不再存在W为止,总共进行DFS的次数就是答案.8个方向对应8个状态转移,每个格子作为DFS的参数最多调用一次,因此时间复杂度为O(8nm)=O(nm). AC 代码: #inc…

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