HDU ACM 2063 过山车(二分匹配)

http://acm.hdu.edu.cn/showproblem.php?pid=2063

 

View Code
 1 #include <iostream>
 2 #include <vector>
 3 using namespace std;
 4 const int MAX = 1500 + 10;
 5 vector <int> v[MAX];
 6 int link[MAX];
 7 int used[MAX];
 8 bool FindPath(int num)
 9 {
10     int len = v[num].size();
11     int i;
12     for(i=0;i<len;i++)
13     {
14         int n = v[num][i];
15         if(!used[n])
16         {
17             used[n] = 1;
18             if(link[n] == -1 || FindPath(link[n]))
19             {
20                 link[n] = num;
21                 return true;
22             }
23         }
24     }
25     return false;
26 }
27 void Solve(int n)
28 {
29     memset(link,-1,sizeof(link));
30     int i;
31     int num = 0;
32     for(i=1;i<=n;i++)
33     {
34         memset(used,0,sizeof(used));
35         if(FindPath(i))
36         {
37             num++;
38         }
39     }
40     cout<<num<<endl;
41 }
42 int main()
43 {
44     int k,f,m;
45     while(cin>>k,k)
46     {
47         cin>>f>>m;
48         int i;
49         for(i=0;i<=f;i++)
50         {
51             v[i].clear();
52         }
53         for(i=0;i<k;i++)
54         {
55             int a,b;
56             cin>>a>>b;
57             v[a].push_back(b);
58         }
59         Solve(f);
60     }
61     return 0;
62 }

 

posted @ 2012-11-03 12:02  zx雄  阅读(238)  评论(0编辑  收藏  举报