bobchennan 2008-06-02 18:57:00
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第一个点少于标准输出50%
program p28;
var
i,j,k,n,s1,s2:longint;
a:array[1..10000000] of longint;
begin
readln(n);
fillchar(a,sizeof(a),0);
for i:=1 to n-1 do
begin
readln(j,k);
a[k]:=j;
end;
readln(s1,s2);
while s1<>s2 do
begin
if a[s1]<>0 then s1:=a[s1];
if a[s2]<>0 then s2:=a[s2];
end;
write(s1);
end.