http://poj.org/problem?id=1655 #include<iostream> using namespace std; typedef struct edge {int a; struct edge *p; }edge; edge *a[21000]; int s[21000]; int b[21000]; int f[21000]; int fr[21000]; int go; void find(int from,int to) {edge *p; p=a[to];fr[to]=from; while(p) {if(p->a==from){p=p->p;continue;} find(to,p->a);p=p->p; } f[go--]=to; } int main() {int i,j,k,n,t,x,y,m,bl,an;edge *p; cin>>t; for(;t>0;t--) {cin>>n; for(i=1;i<=n;i++){a[i]=0;s[i]=-1;b[i]=-1;f[i]=-1;} for(i=1;i<=n-1;i++){cin>>x>>y;p=new edge;p->a=y;p->p=a[x];a[x]=p; p=new edge;p->a=x;p->p=a[y];a[y]=p; } an=n+1; go=n; find(0,1); for(k=n;k>=1;k--) {i=f[k]; m=1;bl=0; p=a[i]; while(p) {if(p->a==fr[i]){p=p->p;continue;} if(bl<s[p->a])bl=s[p->a]; m+=s[p->a]; p=p->p;} if(n-m>bl)bl=n-m; b[i]=bl; s[i]=m; if(b[i]<=an){an=b[i];j=i;} } cout<<j<<' '<<an<<endl; } return 1; }
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