#include #include #include using namespace std; vector edge[100001]; int dist[100001]; void update(int cur, int par, int d){ if( dist[cur] <= d ) return; dist[cur]=d; for( int ei=0; ei < (int) edge[cur].size(); ei++){ int nxt = edge[cur][ei]; if( nxt==par ) continue; update(nxt, cur, d+1); } } int rec(int cur, int par, int d){ dist[cur]=d; int tmpdist = 100001; for( int ei=0; ei < (int) edge[cur].size(); ei++){ int nxt = edge[cur][ei]; if( nxt==par ) continue; tmpdist = min(tmpdist,rec(nxt, cur, d+1)); } if(tmpdist==100001) tmpdist=0; if(tmpdist < d ){ for( int ei=0; ei < (int) edge[cur].size(); ei++){ int nxt = edge[cur][ei]; if( nxt==par ) continue; update(nxt, cur, tmpdist+1); } } dist[cur]=min(dist[cur],tmpdist); return tmpdist+1; } int main(){ int N; scanf("%d",&N); for( int i = 0 ; i < N-1; i++ ){ int a,b; scanf("%d%d",&a,&b); a--;b--; edge[a].push_back(b); edge[b].push_back(a); } for( int i=0;i<100001; i++) dist[i]=100001; rec(0,0,0); for( int i=0; i