Export examples/cpp/ from google3

* Rework network_routing_sat

examples/cpp/variable_intervals_sat.cc

@@ -1,4 +1,21 @@
+// Copyright 2010-2022 Google LLC
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <atomic>
+
+#include "ortools/base/logging.h"
 #include "ortools/sat/cp_model.h"
+#include "ortools/sat/cp_model_solver.h"
 #include "ortools/sat/sat_parameters.pb.h"
 #include "ortools/util/time_limit.h"