Wooden Sticks

Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 26095    Accepted Submission(s): 10554

Problem Description
There is a pile of n wooden sticks. The length and weight of each stick are known in advance. The sticks are to be processed by a woodworking machine in one by one fashion. It needs some time, called setup time, for the machine to prepare processing a stick. The setup times are associated with cleaning operations and changing tools and shapes in the machine. The setup times of the woodworking machine are given as follows:

(a) The setup time for the first wooden stick is 1 minute. 
(b) Right after processing a stick of length l and weight w , the machine will need no setup time for a stick of length l' and weight w' if l<=l' and w<=w'. Otherwise, it will need 1 minute for setup.

You are to find the minimum setup time to process a given pile of n wooden sticks. For example, if you have five sticks whose pairs of length and weight are (4,9), (5,2), (2,1), (3,5), and (1,4), then the minimum setup time should be 2 minutes since there is a sequence of pairs (1,4), (3,5), (4,9), (2,1), (5,2).

 
Input
The input consists of T test cases. The number of test cases (T) is given in the first line of the input file. Each test case consists of two lines: The first line has an integer n , 1<=n<=5000, that represents the number of wooden sticks in the test case, and the second line contains n 2 positive integers l1, w1, l2, w2, ..., ln, wn, each of magnitude at most 10000 , where li and wi are the length and weight of the i th wooden stick, respectively. The 2n integers are delimited by one or more spaces.
 
Output
The output should contain the minimum setup time in minutes, one per line.
 
Sample Input
3
5
4 9 5 2 2 1 3 5 1 4
3
2 2 1 1 2 2
3
1 3 2 2 3 1
 
Sample Output
2
1
3

有若干组木棍:木棍的长度为I 重为W   现在用机器加工这些木头: 规则如下:

1;加工第一组木头会花去1分钟
2:设加工的下一组木头的长度为 I'  重量为W‘   如果   I=<I' 且 W=<W'  ,则加工这根木头不需要花费时间。

问,所花费的最少时间是多少?

可以先按长度和重量从小到大排序,长度相同按重量从小到大排

每次从最前面没选过的开始,计算有多少种递增子序列,加一点技巧会更清楚,具体看代码中间的while部分

 #include<bits/stdc++.h>
using namespace std;
struct node
{
int l,w,flag;
}a[];
void init()
{
for(int i=;i<;i++)
{
a[i].l=;a[i].w=;a[i].flag=;
}
}
bool cmp(node x,node y)
{
if(x.l==y.l)return x.w<y.w;
else return x.l<y.l;
}
int main()
{
int t;
while(~scanf("%d",&t))
{
while(t--)
{
init();
int n;
scanf("%d",&n);
for(int i=;i<n;i++)
{
scanf("%d %d",&a[i].l,&a[i].w);
}
sort(a,a+n,cmp);
// for(int i=0;i<n;i++)
// {
// printf("%d %d\n",a[i].l,a[i].w);
// }
int ans=,j=;
while(j<n)//判断有没有全部选完 ,核心部分
{
ans++;
int tempx=,tempy=;
for(int i=;i<n;i++)
{
if(a[i].l>=tempx&&a[i].w>=tempy&&a[i].flag)//flag==1表示没有被选过
{
a[i].flag=;//选过的标记,下次就不选了
j++;
tempx=a[i].l;
tempy=a[i].w;
}
}
}
printf("%d\n",ans);
}
}
return ;
}

hdu1051 Wooden Sticks(贪心+排序,逻辑)的更多相关文章

  1. 1270: Wooden Sticks [贪心]

    点击打开链接 1270: Wooden Sticks [贪心] 时间限制: 1 Sec 内存限制: 128 MB 提交: 31 解决: 11 统计 题目描述 Lialosiu要制作木棍,给n根作为原料 ...

  2. HDOJ 1051. Wooden Sticks 贪心 结构体排序

    Wooden Sticks Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) To ...

  3. HDU1051 Wooden Sticks 【贪婪】

    Wooden Sticks Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) To ...

  4. Hdu1051 Wooden Sticks 2017-03-11 23:30 62人阅读 评论(0) 收藏

    Wooden Sticks Problem Description There is a pile of n wooden sticks. The length and weight of each ...

  5. HDOJ.1051 Wooden Sticks (贪心)

    Wooden Sticks 点我挑战题目 题意分析 给出T组数据,每组数据有n对数,分别代表每个木棍的长度l和重量w.第一个木棍加工需要1min的准备准备时间,对于刚刚经加工过的木棍,如果接下来的木棍 ...

  6. HDU 1051 Wooden Sticks (贪心)

    Wooden Sticks Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) To ...

  7. uvalive 2322 Wooden Sticks(贪心)

    题目连接:2322 Wooden Sticks 题目大意:给出要求切的n个小木棍 , 每个小木棍有长度和重量,因为当要切的长度和重量分别大于前面一个的长度和重量的时候可以不用调整大木棍直接切割, 否则 ...

  8. HDU - 1051 Wooden Sticks 贪心 动态规划

    Wooden Sticks Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)    ...

  9. POJ-1065 Wooden Sticks,排序+最长单减子序列!

                                                       Wooden Sticks 题意:有一台机器处理木材,最开始需要一分钟准备,如果后面处理的木材比前 ...

随机推荐

  1. jquery分页例子

    先看效果图: 实现原理很简单,使用了jquery.pagination这个插件,每当点击页码时异步去服务器去取该页的数据,简单介绍如下: 一.数据库表结构:很简单  就四个字段 分别是News_id  ...

  2. springboot之静态资源路径配置

    静态资源路径是指系统可以直接访问的路径,且路径下的所有文件均可被用户直接读取. 在Springboot中默认的静态资源路径有:classpath:/META-INF/resources/,classp ...

  3. stm32 GPIO之怪异现象

    1.今天调试GPIO,检测高低电平,插入HDMI为高,不插为低,其他3口均可以检测,唯独PB2口一直检测为高,且电平明显和其他3 port不一样 插上hdmi源,PB2=4.6V,其他3口 = 3.6 ...

  4. http1.X与2.0

    HTTP HTTP 1.X HTTP是建立在TCP协议上的,HTTP协议的瓶颈及优化都是基于TCP协议本身的特性. TCP建立连接时有三次握手 会有1.5RTT的延迟,为了避免每次请求都经历握手待来的 ...

  5. 轻量ORM-SqlRepoEx (八)MySQL、Sql Service 迁移

    数据库变更在编程应用中是常的,MySQL.Sql Service之间的数据迁移更为常见,在 SqlRepoEx2.0DemoForAspCore中演示了,这种数据库之间切换时SqlRepoEx是如何的 ...

  6. 二、Shiro 认证开发

    I.java开发 环境准备 <dependencies> <dependency> <groupId>junit</groupId> <artif ...

  7. 时间比较方法DateTime.Compare

    格式:DateTime.Compare(datetime1, datetime2) 参数为时间格式,为第一个参数比较第二个参数,返回小于0的值,等于0或大于0的值. 实例: string st1 = ...

  8. js中数组的api整理

    首先列出所有的方法: join(), sort(), slice(), splice(), concat(), reverse(), push()+pop(), shift()+unshift(), ...

  9. #leetcode刷题之路8-字符串转换整数 (atoi)

    请你来实现一个 atoi 函数,使其能将字符串转换成整数.首先,该函数会根据需要丢弃无用的开头空格字符,直到寻找到第一个非空格的字符为止.当我们寻找到的第一个非空字符为正或者负号时,则将该符号与之后面 ...

  10. Flask入门数据库的查询集与过滤器(十一)

    1 查询集 : 指数据查询的集合 原始查询集: 不经过任何过滤返回的结果为原始查询集 数据查询集: 将原始查询集经过条件的筛选最终返回的结果 查询过滤器: 过滤器 功能 cls.query.filte ...