标签：tick who pes represent contains == ret nsis logs
Wooden Sticks
Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 22000 Accepted Submission(s): 8851
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
Source
思路：将木棒按l,w 递减的顺序排列，统计关于递减的连续子列的个数即为答案。
代码：
1 #include "cstdio"
2 #include "iostream"
3 #include "algorithm"
4 #include "string"
5 #include "cstring"
6 #include "queue"
7 #include "cmath"
8 #include "vector"
9 #include "map"
10 #include "stdlib.h"
11 #include "set"
12 #define mj
13 #define db double
14 #define ll long long
15 using namespace std;
16 const int N=1e6+5;
17 const int mod=1e9+7;
18 const ll inf=1e16+10;
19 bool u[N];
20 typedef struct stu{
21 int l,w;
22 }M;
23 M s[5005];
24 int cmp(M a,M b)
25 {
26 if(a.l==b.l) return a.w>=b.w;
27 return a.l>=b.l;
28 }
29 int main()
30 {
31 int t,n,i,j,ans;
32 scanf("%d",&t);
33 while(t--)
34 {
35 scanf("%d",&n);
36 for(i=0;i<n;i++)
37 scanf("%d%d",&s[i].l,&s[i].w),u[i]=0;
38 sort(s,s+n,cmp);
39 int mi;
40 ans=0;
41 for(i=0;i<n;i++)
42 {
43 if(u[i]) continue;
44 mi=s[i].w;
45 for(j=i+1;j<n;j++)
46 {
47 if(!u[j]&&s[j].w<=mi){
48 mi=s[j].w;
49 u[j]=1;
50 }
51 }
52 ans++;
53 }
54 printf("%d\n",ans);
55 }
56 return 0;
57 }
HDU 1051 Wooden Sticks 贪心||DP
标签：tick who pes represent contains == ret nsis logs
原文地址：http://www.cnblogs.com/mj-liylho/p/7153108.html
