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1076. Trash(KM算法 二分最佳完美匹配)

时间:2015-06-25 23:06:47      阅读:529      评论:0      收藏:0      [点我收藏+]

标签:刘汝佳   算法入门经典   acm   编程   算法   

1076. Trash

Time limit: 1.0 second
Memory limit: 64 MB
You were just hired as CEO of the local junkyard.One of your jobs is dealing with the incoming trash and sorting it for recycling.The trash comes every day in N containers and each of these containers contains certain amount of each of the N types of trash. Given the amount of trash in the containers find the optimal way to sort the trash. Sorting the trash means putting every type of trash in separate container. Each of the given containers has infinite capacity. The effort for moving one unit of trash from container i to j is 1 if i ≠ j otherwise it is 0.You are to minimize the total effort.

Input

The first line contains the number N (1 ≤ N ≤ 150), the rest of the input contains the descriptions of the containers.The (1 + i)-th line contains the description of the i-th container the j-th amount (0 ≤ amount ≤ 100) on this line denotes the amount of the j-th type of trash in the i-th container.

Output

You should write the minimal effort that is required for sorting the trash.

Sample

input output
4
62 41 86 94
73 58 11 12
69 93 89 88
81 40 69 13
650
Problem Author: Jivko Ganev

Tags: graph theory  (

hide tags for unsolved problems
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天呢!原谅哥这次套一次 自己没有理解的模版吧 ~感觉好难受~ ,时间紧迫 !~也只能这样了。测试了一下模版是对的。1a,然后我就会把它弄到我的小模版库~,的确 有些东西确实很难理解,但是应该用这个时间干点儿更有意义的事儿 !第一次套黑盒代码。嘿嘿~


#include<iostream>
#include<sstream>
#include<algorithm>
#include<cstdio>
#include<string.h>
#include<cctype>
#include<string>
#include<cmath>
#include<vector>
#include<stack>
#include<queue>
#include<map>
#include<set>
using namespace std;
const int INF=10000;
int W[INF][INF],n;
int Lx[INF],Ly[INF];//
int Left[INF];  //
bool S[INF],T[INF];//
int sum[INF];
int matrix[INF][INF];
bool match(int i)
{
    S[i]=true;
    for(int j=1; j<=n; j++)
        if(Lx[i]+Ly[j]==W[i][j]&&!T[j])
        {
            T[j]=true;
            if(!Left[j]||match(Left[j]))
            {
                Left[j]=i;
                return true;
            }
        }
    return false;
}

void update()
{
    int a=1<<30;
    for(int i=1; i<=n; i++)if(S[i])
            for(int j=1; j<=n; j++)if(!T[j])
                    a=min(a,Lx[i]+Ly[j]-W[i][j]);
    for(int i=1; i<=n; i++)
    {
        if(S[i])Lx[i]-=a;
        if(T[i])Ly[i]+=a;
    }
}

int  KM()
{
    for(int i=1; i<=n; i++)
    {
        Left[i]=Lx[i]=Ly[i]=0;
        for(int j=1; j<=n; j++)
            Lx[i]=max(Lx[i],W[i][j]);
    }
    for(int i=1; i<=n; i++)
    {
        for(;;)
        {
            for(int j=1; j<=n; j++) S[j]=T[j]=0;
            if(match(i))break;
            else update();
        }
    }
    int sum = 0;
    for(int i = 1; i <= n; i ++)
        if(match[i] > 0)
            sum += W[Left[i]][i];
    return sum;
}

int main()
{
    while(cin>>n)
    {
        memset(sum,0,sizeof(sum));
        for(int i=1; i<=n; i++)
            for(int j=1; j<=n; j++)
            {
                scanf("%d",&matrix[i][j]);
                sum[j]+=matrix[i][j];
            }
        for(int i=1; i<=n; i++)
            for(int j=1; j<=n; j++)
                W[i][j]=-(sum[j]-matrix[i][j]);
        cout<<-KM()<<endl;
    }
    return 0;
}


1076. Trash(KM算法 二分最佳完美匹配)

标签:刘汝佳   算法入门经典   acm   编程   算法   

原文地址:http://blog.csdn.net/lsgqjh/article/details/46640587

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