message: Update bus-routes.cpp
diff: @@ -15,8 +15,8 @@ public:
  }
  int result = 1;
  - vector<int> q({S});
  - unordered_set<int> lookup({S});
  + vector<int> q{S};
  + unordered_set<int> lookup{S};
  while (!q.empty()) {
  vector<int> next_q;
  for (const auto& stop : q) {
  