Improve readability

include/graph/breadth_first_tree.h

@@ -15,7 +15,9 @@ public:
 
   BreadthFirstTree(Digraph<T> G, T root);
 
-  T root;
+  void removeEdgeTo(const T& u);
+
+  T root{};
 };
 
 template<typename T>
@@ -23,6 +25,18 @@ BreadthFirstTree<T>::BreadthFirstTree(Digraph<T> G, T root) {
   this->adjList = algo::BreadthFirstSearch<T>(G.adjList).execute(root);
 }
 
+template<typename T>
+void BreadthFirstTree<T>::removeEdgeTo(const T& u) {
+  for (const auto& x : this->vertices()) {
+    for (const auto& y : this->adjList[x]) {
+      if (y == u) {
+        this->remove(x, u);
+        return;
+      }
+    }
+  }
+}
+
 } // namespace graph
 
 #endif