Add roditty and zwick class

algorithm/roditty_zwick.h

@@ -0,0 +1,55 @@
+#ifndef RODITTY_ZWICK_H_
+#define RODITTY_ZWICK_H_
+
+#include "graph/digraph.h"
+#include "graph/scc.h"
+#include "algorithm/tarjan.h"
+#include "algorithm/bfs.h"
+
+#include <vector>
+
+using namespace graph;
+
+namespace algo {
+
+// A randomized decremental algorithm for maintaining SCCs
+template<typename T>
+class RodittyZwick {
+public:
+  RodittyZwick(Digraph<T> G) : G(G) {}
+
+  //
+  void sccDecrementalMaintenance();
+
+  //
+  void tcDecrementalMaintenance();
+private:
+  Digraph<T> G;
+};
+
+template<typename T>
+void RodittyZwick<T>::sccDecrementalMaintenance() {
+  std::map<T, T> A;
+  Tarjan<T> tarjan(G);
+
+  auto sccs = tarjan.run();
+
+  for (auto& scc : sccs) {
+    const auto& root = scc.representative();
+    BFS<T> bfs(scc);
+    auto spt = bfs.run(root);
+    for (const auto& vertex : scc.vertices) {
+      A[vertex] = root;
+    }
+
+  }
+}
+
+template<typename T>
+void RodittyZwick<T>::tcDecrementalMaintenance() {
+
+}
+
+}; // namespace algo
+
+#endif