解题报告：洛谷 P3047 [USACO12FEB]附近的牛Nearby Cows

题目链接 参考代码 ... int n,k,e,ui,vi; int head[MAXN],dp[MAXN][25]; void preDfs(int u,int f) { for (int i = head[u];i;i = info[i].nxt) { int v = info[i].to; if (v == f) continue; preDfs(v,u); for (

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