Description Your boss once had got many copies of a treasure map. Unfortunately, all the copies are now broken to many rectangular pieces, and what make it worse, he has lost some of the pieces. Luckily, it is possible to figure out the position of e…

用最少的矩阵覆盖n*m的地图.注意矩阵不能互相覆盖. 这里显然是一个精确覆盖,但因为矩阵拼接过程中,有公共的边,这里须要的技巧就是把矩阵的左边和以下截去一个单位. #include <stdio.h> #include <string.h> #include <iostream> #include <algorithm> #include <vector> #include <queue> #include <set> #…

Treasure Map Time Limit:2000MS     Memory Limit:32768KB     64bit IO Format:%lld & %llu Submit Status Practice ZOJ 3209 Appoint description:  System Crawler  (2015-04-09) Description Your boss once had got many copies of a treasure map. Unfortunately…

Treasure Map Time Limit: 2 Seconds      Memory Limit: 32768 KB Your boss once had got many copies of a treasure map. Unfortunately, all the copies are now broken to many rectangular pieces, and what make it worse, he has lost some of the pieces. Luck…

Treasure Map Time Limit: 2 Seconds      Memory Limit: 32768 KB Your boss once had got many copies of a treasure map. Unfortunately, all the copies are now broken to many rectangular pieces, and what make it worse, he has lost some of the pieces. Luck…

直接精确覆盖 开始逐行添加超时了,换成了单点添加 #include <iostream> #include <cstring> #include <cstdio> #include <cmath> #include <vector> using namespace std; #define FOR(i,A,s) for(int i = A[s]; i != s; i = A[i]) #define exp 1e-8 ; int n, m, k,…

题意:一个 n x m 的矩形(1 <= n, m <= 30),现给出这个矩形中 p 个(1 <= p <= 500)子矩形的左下角与右下角坐标,问最少用多少个子矩形能够恰好组成这个 n x m 的大矩形. 题目链接:http://acm.zju.edu.cn/onlinejudge/showProblem.do?problemId=3372 -->>这是精确覆盖问题,而DLX正是解决精确覆盖问题的有利武器.. 模型转换:将原矩形变成一行,作为 DLX 中的列,表示要…

题目链接 精确覆盖的模板题, 把每一个格子当成一列就可以. S忘记初始化TLE N次, 哭晕在厕所...... #include<bits/stdc++.h> using namespace std; #define pb(x) push_back(x) #define ll long long #define mk(x, y) make_pair(x, y) #define lson l, m, rt<<1 #define mem(a) memset(a, 0, sizeof(a…

题意 :  给你一个大小为 n * m 的矩形 , 坐标是( 0 , 0 ) ~ ( n , m )  .然后给你 p 个小矩形 . 坐标是( x1 , y1 ) ~ ( x2 , y2 ) , 你选择最小的几个矩形 , 使得这些矩形能够覆盖整个矩形 . 而且互相不会重叠 .( n , m <= 30 ) 思路 : Dancing Links 的精确覆盖问题 . 我们将 n * m 的矩形分成 n * m 个小正方形 ,那么我们仅仅要保证每一个小正方形被覆盖且仅仅被覆盖一次就可以 . 那么列表示…

题目链接:https://vjudge.net/problem/ZOJ-3209 Treasure Map Time Limit: 2 Seconds      Memory Limit: 32768 KB Your boss once had got many copies of a treasure map. Unfortunately, all the copies are now broken to many rectangular pieces, and what make it wo…

E - Treasure Hunt I Time Limit:2000MS Memory Limit:65536KB Description Akiba is a dangerous country since a bloodsucker living there. Sometimes the bloodsucker will appear and kill everyone who isn't at his hometown. One day, a brave person named CC…

Description There is a robot, its task is to bury treasures in order on a N × M grids map, and each treasure can be represented by its weight, which is an integer. The robot begins to bury the treasures from the top-left grid. Because it is stupid, i…

Treasure Hunt I Time Limit: 2 Seconds      Memory Limit: 65536 KB Akiba is a dangerous country since a bloodsucker living there. Sometimes the bloodsucker will appear and kill everyone who isn't at his hometown. One day, a brave person named CC finds…

Description A Sudoku grid is a 16x16 grid of cells grouped in sixteen 4x4 squares, where some cells are filled with letters from A to P (the first 16 capital letters of the English alphabet), as shown in figure 1a. The game is to fill all the empty g…

H - Treasure Hunt IV Time Limit:2000MS     Memory Limit:65536KB     64bit IO Format:%lld & %llu Description Alice is exploring the wonderland, suddenly she fell into a hole, when she woke up, she found there are b - a + 1 treasures labled a from b in…

题意:有n个城市并排着,每个城市有些珠宝,有两个人站在第s个城市准备收集珠宝,两人可以各自行动,但两人之间的距离不能超过dis,而且每经过一个城市就需要消耗1天,他们仅有t天时间收集珠宝,问最多能收集多少珠宝? 思路: 其实就是类似一个滑动窗口在收集一个序列上的权值.首先两个人可以同时往两边散开,直到极限距离dis(这样省时),然后他们可能往左/右走,也可能往左走一会儿再往右走,也可能往右走一会儿再往左走.可以看出其实这些考虑都是对称的,那么我们主要考虑1边就行了.可以尝试枚举往左边走k天,其他…

题意:给一棵树,一个人站在节点s,他有m天时间去获取各个节点上的权值,并且最后需要回到起点s,经过每条边需要消耗v天,问最少能收获多少权值? 思路: 常规的,注意还得跑回原地s. //#include <bits/stdc++.h> #include <iostream> #include <cstdio> #include <cstring> #include <map> #include <algorithm> #include…

精确覆盖 #include <iostream> #include <cstdio> #include <cstring> #include <algorithm> #include <vector> using namespace std; const int maxn=920; const int maxnode=920*550; const int maxr=550; int ans; struct DLX { int n , sz; //…

本文出自   http://blog.csdn.net/shuangde800 题目链接:zoj-3627 题意 直线上有n个城市, 第i个城市和i+1个城市是相邻的.  每个城市都有vi的金币.    Alice和Bob站在城市p, 他们每天可以选择走向一个相邻的城市, 也可以选择不走. 他们是单独行动的.    他们经过一个城市就可以获得相应的金币(不能重复获得)    作为一个队伍, 他们的最远距离不能操作M, 问T天内, 他们最多一共能拿多少金币? 思路 由于每次只能走一步,那么一定是一…

http://codeforces.com/gym/101617/attachments 题意:给出一个图,每个顶点代表一个金矿,每个金矿有g和d两个值,g代表金矿初始的金子量,d是该金矿每天的金子量会减少d.顶点与顶点之间存在边,意思是从一个金矿到另一个金矿需要花费的天数.现在有个人一开始在1金矿,问最多能挖到多少金矿,注意,不能在一个金矿连续挖几天. 思路:bfs求解,但是需要剪枝,用二位数组d[v][day]记录第day天时在v金矿所能获得的最大值. #include<iostream>…

DLX用于优化精确覆盖问题,由于普通的DFS暴力搜索会超时,DLX是一个很强有力的优化手段,其实DLX的原理很简单,就是利用十字链表的快速删除和恢复特点,在DFS时删除一些行和列以减小查找规模,使得搜索深度越深而越小,然后回溯继续查找.具体资料可[点击这里]. 精确覆盖问题(补充):具体一点儿就是给你一个0-1矩阵,要你找出一些行,使得每一列都有且只有一个1. HUST 1017 Exact cover 入门必做,测试模板. #include <stdio.h> #include <st…

学习资料: http://www.cnblogs.com/grenet/p/3145800.html http://blog.csdn.net/mu399/article/details/7627862 2份模版 第一份精确覆盖 from POJ 3074 ; ; + ; + MAXM + ; int g[MAXN]; struct DLX { int n,m,sz; int U[MAXNODE],D[MAXNODE],R[MAXNODE],L[MAXNODE],Row[MAXNODE],Col…

一些链接: http://www.cnblogs.com/-sunshine/p/3358922.html http://www.cnblogs.com/grenet/p/3145800.html 1.hust 1017 Exact cover (Dancing Links 模板题) 题意:n*m的单位矩阵.现在要选一些行,使得这些行的集合中每列只出现一个1. 思路:裸的精确覆盖问题.刷一遍模板. #include <iostream> #include <stdio.h> #in…

KUANGBIN带你飞 全专题整理 https://www.cnblogs.com/slzk/articles/7402292.html 专题一 简单搜索 POJ 1321 棋盘问题    //2019.3.18 POJ 2251 Dungeon Master POJ 3278 Catch That Cow  //4.8 POJ 3279 Fliptile POJ 1426 Find The Multiple  //4.8 POJ 3126 Prime Path POJ 3087 Shuffle…

[kuangbin带你飞]专题1-23 专题一 简单搜索 POJ 1321 棋盘问题POJ 2251 Dungeon MasterPOJ 3278 Catch That CowPOJ 3279 FliptilePOJ 1426 Find The MultiplePOJ 3126 Prime PathPOJ 3087 Shuffle'm UpPOJ 3414 PotsFZU 2150 Fire GameUVA 11624 Fire!POJ 3984 迷宫问题HDU 1241 Oil Deposit…

专题一 简单搜索 POJ 1321 棋盘问题POJ 2251 Dungeon MasterPOJ 3278 Catch That CowPOJ 3279 FliptilePOJ 1426 Find The MultiplePOJ 3126 Prime PathPOJ 3087 Shuffle'm UpPOJ 3414 PotsFZU 2150 Fire GameUVA 11624 Fire!POJ 3984 迷宫问题HDU 1241 Oil DepositsHDU 1495 非常可乐HDU 26…

1. hust 1017 DLX精确覆盖 模板题 勉强写了注释,但还是一脸懵逼,感觉插入方式明显有问题但又不知道哪里不对而且好像能得出正确结果真是奇了怪了 #include <iostream> #include <string.h> #include <cstdio> #include <queue> #include <map> #include <vector> #include <string> #include…

转自——http://blog.csdn.net/qwe20060514/article/details/8112550 =============================以下是最小生成树+并查集======================================[HDU]1213   How Many Tables   基础并查集★1272   小希的迷宫   基础并查集★1325&&poj1308  Is It A Tree?   基础并查集★1856   More i…

Treasure Map Time Limit: 2 Seconds      Memory Limit: 32768 KB Your boss once had got many copies of a treasure map. Unfortunately, all the copies are now broken to many rectangular pieces, and what make it worse, he has lost some of the pieces. Luck…

[ZOJ3626]Treasure Hunt I Time Limit: 2 Seconds      Memory Limit: 65536 KB Akiba is a dangerous country since a bloodsucker living there. Sometimes the bloodsucker will appear and kill everyone who isn't at his hometown. One day, a brave person named…