Trajan

void dfs(int x) { inst[x]=1; st.push(x); dfn[x]=low[x]=++Time; for(int t=las[x];t;t=nn[t]) { int y=e[t]; if(!dfn[y])dfs(y),low[x]=min(low[x],low[y]); else if(inst[y])low[x]=min(low[x],dfn[y

>>阅读原文<<