mzuenni tests

1 files changed, 32 insertions, 0 deletions

diff --git a/content/graph/scc.cpp b/content/graph/scc.cpp
new file mode 100644
index 0000000..ac9a40b
--- /dev/null
+++ b/content/graph/scc.cpp
@@ -0,0 +1,32 @@
+vector<vector<int>> adj, sccs;
+int counter;
+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]) {
+		sccs.push_back({});
+		for (int u = -1; u != v;) {
+			u = s.back(); s.pop_back(); inStack[u] = false;
+			idx[u] = sz(sccs) - 1;
+			sccs.back().push_back(u);
+}}}
+
+void scc() {
+	inStack.assign(sz(adj), false);
+	low.assign(sz(adj), -1);
+	idx.assign(sz(adj), -1);
+	sccs.clear();
+
+	counter = 0;
+	for (int i = 0; i < sz(adj); i++) {
+		if (low[i] < 0) visit(i);
+}}