西游记里美，国色天香
树的重心链式前向星
dfs
C++
#include<iostream>
using namespace std;
const int N=1010;
const int M=2*N;
int h,e,ne,st,idx=0;
int ans=INT_MAX;
void add(int a,int b){
e=b;
ne=h;
h=idx++;
e=a;
ne=h;
idx++;
}
int dfs(int u){
st=1;
int res=0,sum=1;
for(int i=h;i!=-1;i=ne){
int j=e;
if(!st){
int s=dfs(j);
res=max(res,s);
sum+=s;
}
}
res=max(res,n-sum);
ans=min(ans,res);
return sum;
}
int main(){
ios::sync_with_stdio(false);
cin.tie(nullptr);//加速,取消绑定cin&scanfcout&printf
memset(h,-1,sizeof h);
int n;
cin>>n;
for(int i=0;i<n-1;i++){
int a,b;
cin>>a>>b;
add(a,b);
}
dfs(1);
cout<<ans<<endl;
return 0;
}
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