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vector<vector<int>> adj;
int counter, sccCounter;
vector<bool> inStack;
vector<int> low, idx, s; //idx enthält Index der SCC pro Knoten.
void visit(int v) {
int old = low[v] = counter++;
s.push_back(v);
inStack[v] = true;
for (auto u : adj[v]) {
if (low[u] < 0) visit(u);
if (inStack[u]) low[v] = min(low[v], low[u]);
}
if (old == low[v]) {
sccCounter++;
for (int u = -1; u != v;) {
u = s.back();
s.pop_back();
inStack[u] = false;
idx[u] = sccCounter - 1;
}}}
void scc() {
inStack.assign(ssize(adj), false);
low.assign(ssize(adj), -1);
idx.assign(ssize(adj), -1);
counter = sccCounter = 0;
for (int i = 0; i < ssize(adj); i++) {
if (low[i] < 0) visit(i);
}}
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