diff --git a/examples/cpp/model_util.cc b/examples/cpp/model_util.cc
index 6d324cf366..ccbb6fa596 100644
--- a/examples/cpp/model_util.cc
+++ b/examples/cpp/model_util.cc
@@ -11,6 +11,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+#include "base/unique_ptr.h"
+
 #include "base/commandlineflags.h"
 #include "base/commandlineflags.h"
 #include "base/integral_types.h"
@@ -203,7 +205,7 @@ void DeclareConstraint(int index,
 void ExportToGraphFile(const CPModelProto& proto,
                        File* const file,
                        GraphExporter::GraphFormat format) {
-  scoped_ptr<GraphExporter> exporter(
+  std::unique_ptr<GraphExporter> exporter(
       GraphExporter::MakeFileExporter(file, format));
   exporter->WriteHeader(proto.model());
   for (int i = 0; i < proto.expressions_size(); ++i) {
@@ -274,7 +276,6 @@ void ExportToGraphFile(const CPModelProto& proto,
 int Run() {
   // ----- Load input file into protobuf -----
 
-  File::Init();
   File* const file = File::Open(FLAGS_input, "r");
   if (file == NULL) {
     LOG(WARNING) << "Cannot open " << FLAGS_input;
diff --git a/examples/cpp/nqueens.cc b/examples/cpp/nqueens.cc
index 44c5ff8a7b..a7a2c828ef 100644
--- a/examples/cpp/nqueens.cc
+++ b/examples/cpp/nqueens.cc
@@ -77,7 +77,7 @@ class NQueenSymmetry : public SymmetryBreaker {
  private:
   Solver* const solver_;
   const std::vector<IntVar*> vars_;
-  std::map<IntVar*, int> indices_;
+  std::map<const IntVar*, int> indices_;
   const int size_;
 };
 
diff --git a/examples/cpp/parse_dimacs_assignment.h b/examples/cpp/parse_dimacs_assignment.h
index 79386b2975..f4b8cbf46b 100644
--- a/examples/cpp/parse_dimacs_assignment.h
+++ b/examples/cpp/parse_dimacs_assignment.h
@@ -21,6 +21,7 @@
 #include <algorithm>
 #include <cstdio>
 #include <cstring>
+#include "base/unique_ptr.h"
 #include <string>
 
 #include "base/callback.h"
@@ -89,7 +90,7 @@ template <typename GraphType> class DimacsAssignmentParser {
     const char* reason;
     NodeIndex num_left_nodes;
     ArcIndex num_arcs;
-    scoped_ptr<string> bad_line;
+    std::unique_ptr<string> bad_line;
   };
 
   ErrorTrackingState state_;
@@ -288,7 +289,7 @@ LinearSumAssignment<GraphType>* DimacsAssignmentParser<GraphType>::Parse(
     *error_message = "empty graph description";
     return NULL;
   }
-  scoped_ptr<PermutationCycleHandler<ArcIndex> > cycle_handler(
+  std::unique_ptr<PermutationCycleHandler<ArcIndex> > cycle_handler(
       assignment_->ArcAnnotationCycleHandler());
   GraphType* graph = graph_builder_->Graph(cycle_handler.get());
   if (graph == NULL) {
diff --git a/examples/cpp/strawberry_fields_with_column_generation.cc b/examples/cpp/strawberry_fields_with_column_generation.cc
index 4e2bf58fa2..74f30fbb9d 100644
--- a/examples/cpp/strawberry_fields_with_column_generation.cc
+++ b/examples/cpp/strawberry_fields_with_column_generation.cc
@@ -54,6 +54,7 @@
 #include <stdio.h>
 #include <string.h>  // strlen
 #include <map>
+#include "base/unique_ptr.h"
 #include <string>
 #include <utility>
 #include <vector>