Add tests for same SCC O(1) query

algorithm/decremental_scc.h

@@ -36,14 +36,14 @@ private:
   std::map<T, std::pair<Digraph<T>, Digraph<T>>> SPT;
 
   // Connect each representative with its SCC
-  std::map<T, SCC<T>> SCCs;
+  std::map<T, SCC<T>> connection;
 };
 
 template<typename T>
 void DecrementalSCC<T>::init() {
-  auto tarjan = Tarjan<T>(G).run();
+  auto SCCs = Tarjan<T>(G).findSCC();
 
-  for (auto& C : tarjan) {
+  for (auto& C : SCCs) {
     const auto& w = C.representative();
 
     // Create shortest-paths out-tree/in-tree
@@ -55,7 +55,7 @@ void DecrementalSCC<T>::init() {
       A[v] = w;
 
     // Link SCC with its representative w
-    SCCs[w] = C;
+    connection[w] = C;
   }
 }
 
@@ -77,7 +77,7 @@ void DecrementalSCC<T>::remove(const T& u, const T& v) {
     return;
 
   // Update In(w) and Out(w)
-  auto inTree = BFS<T>(SCCs[w]).run(w);
+  auto inTree = BFS<T>(connection[w]).run(w);
   SPT[w] = std::make_pair(inTree, inTree.reverse());
 
   if (!SPT[w].second.vertices.contains(u) ||