http://poj.org/problem?id=3177 //* @author: 82638882@163.com import java.io.*; public class Main { static int a,cnt=1; static int[] rank,un; static boolean[][] map; public static void main(String[] args) throws NumberFormatException, IOException { InputStreamReader is=new InputStreamReader(System.in); BufferedReader in=new BufferedReader(is); String[] ss=in.readLine().split(" "); a=Integer.parseInt(ss[0]); map=new boolean[a+1][a+1]; rank=new int[a+1]; un=new int[a+1]; for(int i=1;i<=a;i++) un[i]=i; int b=Integer.parseInt(ss[1]); for(int i=0;i< b;i++) { ss=in.readLine().split(" "); int x=Integer.parseInt(ss[0]); int y=Integer.parseInt(ss[1]); map[x][y]=map[y][x]=true; } dsf(1,1,rank,un); int cnt=0; for(int i=1;i<=a;i++) rank[i]=0; for(int i=1;i<=a;i++) { int yy=root(i,un); for(int j=1;j<=a;j++) { if(!map[i][j]) continue; int ww=root(j,un); if(ww!=yy) { rank[yy]++; if(rank[yy]>1) break; } } } for(int i=1;i<=a;i++) { if(rank[i]==1)cnt++; } System.out.println((cnt+1)/2); } static void dsf(int n,int pre,int[] rank,int[] un) { if(rank[n]!=0) { for(int i=1;i<=a;i++) if(rank[i]>rank[n]) union(i,n,un); } else { rank[n]=cnt++; for(int i=1;i<=a;i++) { if(map[i][n]&&i!=pre&&root(i,un)!=root(n,un)) dsf(i,n,rank,un); } rank[n]=0; } } static void union(int a,int b,int[] un) { int x1=root(a,un); int y1=root(b,un); if(x1>y1)un[x1]=y1; else un[y1]=x1; } static int root(int a,int[] un) { int b=a; while(b!=un[b]) b=un[b]; return un[a]=b; } }
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