核心收集机制:回溯时若满足\(low[v] \ge dfn[u]\),则从栈顶弹出节点直到弹出\(v\)为止,弹出的节点与当前节点\(u\)共同构成一个 v-BCC。注意:当前节点\(u\)绝对不能出栈,必须留... 戳我看核心代码vector int g[N]; int dfn[N], low[N], dfn_clock, st[N], top; int ecc[N], ecc_cnt; vector vector int ecc_block; void dfs(int u, int fa) { dfn[u] = low[u] = ++dfn_clock, st[++...