C - Andryusha and Colored Balloons

思路:

  水题;

代码:

#include <cstdio>
#include <cstring>
#include <iostream>
#include <algorithm> using namespace std; #define maxn 200005 int n,head[maxn],cnt,E[maxn<<],V[maxn<<],dis[maxn],ans; void dfs(int now,int fa)
{
int ki=;
for(int i=head[now];i;i=E[i])
{
if(V[i]==fa) continue;
ki++;
if(ki==dis[fa]) ki++;
if(ki==dis[now]) ki++;
if(ki==dis[fa]) ki++;
if(ki==dis[now]) ki++;
dis[V[i]]=ki,dfs(V[i],now);
}
} int main()
{
scanf("%d",&n);int u,v;
for(int i=;i<n;i++)
{
scanf("%d%d",&u,&v);
E[++cnt]=head[u],V[cnt]=v,head[u]=cnt;
E[++cnt]=head[v],V[cnt]=u,head[v]=cnt;
}
dis[]=,dfs(,);
for(int i=;i<=n;i++) ans=max(ans,dis[i]);
printf("%d\n",ans);
for(int i=;i<=n;i++) printf("%d ",dis[i]);
return ;
}

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