求连通分量

求连通分量
Time Limit:1000MS  Memory Limit:65536K
Total Submit:235 Accepted:134 
Description 
求一个图的连通分量
Input 
n 顶点数(<=100) 
边
Output 
连通分量
Sample Input 
5
1 2
3 4
2 3
0 0
Sample Output 
4
Source 
elba

var  n,x,y,i,ans,max,maxn:longint;
     a:array[0..101,0..101]of longint;
     v:array[0..101]of boolean;

procedure dfs(x:longint);
var  i:longint;
begin
  for i:=1 to n do
    if (a[i,x]=1)and(v[i]=false) then
      begin
        v[i]:=true;
        inc(ans);
        dfs(i);
      end;
end;

begin
  readln(n);
  readln(x,y);
  while (x<>0)or(y<>0) do
    begin
      a[x,y]:=1;
      a[y,x]:=1;
      readln(x,y);
    end;
  for i:=1 to n do
    begin
      ans:=0;
      dfs(i);
      if ans>max then max:=ans;
    end;
  write(max);
end.