Power Stations Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 2164    Accepted Submission(s): 626Special Judge Problem Description There are N towns in our country, and some of them are connect…

题意: 给你n.m.d,代表有n个城市.m条城市之间的关系,每一个城市要在日后d天内都有电. 对于每一个城市,都有一个发电站,每一个发电站能够在[a,b]的每一个连续子区间内发电. x城市发电了.他相邻的城市也有电.而且每一个发电站仅仅能启动一次.或者不启动. 如今问,怎样安排发电站的启动.保证每一个城市d天都有电. 输出发电方案.不发电的话输出0 0 思路: 一个简单的精确覆盖问题.就是建图比較麻烦一点. 这里考虑到每天都要得到电.所以把每一个城市每天都设为列(n*d) 然后每一个城市对于[a…

我为什么T了.... Power Stations Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 2517    Accepted Submission(s): 748Special Judge Problem Description There are N towns in our country, and some of them…

[题目链接] http://acm.hdu.edu.cn/showproblem.php?pid=3663 [算法] 先建图,然后用Dancing Links求解精确覆盖,即可 [代码] #include<bits/stdc++.h> using namespace std; #define MAXN 500000 int i,j,k,l,m,cnt,N,M,D,u,v; ][]; struct Time { int s,e; } ans[],a[]; struct info { int l,…

题目链接 Problem Description Talented Mr.Tang has n strings consisting of only lower case characters. He wants to charge them with Balala Power (he could change each character ranged from a to z into each number ranged from 0 to 25, but each two differen…

思路:把每个点拆成(d+1)*n列,行数为可拆分区间数.对所有的有i号点拆分出来的行都要建一条该行到i列的边,那么就能确保有i号点拆出来的行只能选择一行. #include<set> #include<cmath> #include<queue> #include<cstdio> #include<vector> #include<string> #include<cstdlib> #include<cstring&…

DLX.针对每个城市,每个城市可充电的区间构成一个plan.每个决策由N*D个时间及N个精确覆盖构成. /* 3663 */ #include <iostream> #include <string> #include <map> #include <queue> #include <set> #include <stack> #include <vector> #include <deque> #includ…

POJ 3074 : Description In the game of Sudoku, you are given a large 9 × 9 grid divided into smaller 3 × 3 subgrids. For example, . 2 7 3 8 . . 1 . . 1 . . . 6 7 3 5 . . . . . . . 2 9 3 . 5 6 9 2 . 8 . . . . . . . . . . . 6 . 1 7 4 5 . 3 6 4 . . . . .…

1017 - Exact cover Time Limit: 15s Memory Limit: 128MB Special Judge Submissions: 6751 Solved: 3519 Description There is an N*M matrix with only 0s and 1s, (1 <= N,M <= 1000). An exact cover is a selection of rows such that every column has a 1 in e…

http://acm.hdu.edu.cn/showproblem.php?pid=4318 题意: 给出运输路线,每条路线运输时都会损失一定百分比的量,给定起点.终点和初始运输量,问最后到达终点时最少损失多少量. 思路: d[u]表示到达该点时剩余量的最大值. 将松弛条件修改为大时更新即可. #include<iostream> #include<cstdio> #include<cstring> #include<queue> using namespa…