(int u, int v)
| 46 | public static int[] change = new int[MAXN << 2]; |
| 47 | |
| 48 | public static void addEdge(int u, int v) { |
| 49 | next[++cntg] = head[u]; |
| 50 | to[cntg] = v; |
| 51 | head[u] = cntg; |
| 52 | } |
| 53 | |
| 54 | // 递归版，C++可以通过，java会爆栈 |
| 55 | public static void dfs1(int u, int f) { |