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  • HDU 1051:Wooden Sticks

    Wooden Sticks

    Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)
    Total Submission(s): 16247    Accepted Submission(s): 6668


    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
     

    Source
     

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    迷失在幽谷中的鸟儿,独自飞翔在这偌大的天地间,却不知自己该飞往何方……

    #include<iostream>
    #include<string.h>
    #include<algorithm>
    using namespace std;
    struct mood
    {
        int w;
        int l;
    } d[5005];
    bool cmp(mood a,mood b)
    {
        if(a.l==b.l)
            return a.w<b.w;
        return a.l<b.l;
    }
    int k[5005];
    int main()
    {
        int n;
        cin>>n;
        while(n--)
        {
            int m;
            cin>>m;
            for(int i=0; i<m; i++)
                cin>>d[i].l>>d[i].w;
            sort(d,d+m,cmp);
            memset(k,-1,sizeof(k));
            int flag=0;
            for(int i=0; i<m; i++)
                for(int j=0; j<=m; j++)
                    if(d[i].w>=k[j])
                    {
                        k[j]=d[i].w;
                        if(j+1>flag)flag=j+1;
                        break;
                    }
            cout<<flag<<endl;
        }
        return 0;
    }
    


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  • 原文地址:https://www.cnblogs.com/im0qianqian/p/5989549.html
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