diff --git a/ortools/base/strtoint.cc b/ortools/base/strtoint.cc
index 498746837a..9aa1d6e8be 100644
--- a/ortools/base/strtoint.cc
+++ b/ortools/base/strtoint.cc
@@ -18,17 +18,18 @@
 #include <string>
 
 #include "absl/strings/numbers.h"
+#include "absl/strings/string_view.h"
 #include "ortools/base/logging.h"
 
 namespace operations_research {
 
-int32_t strtoint32(const std::string& word) {
+int32_t strtoint32(absl::string_view word) {
   int result;
   CHECK(absl::SimpleAtoi(word, &result));
   return result;
 }
 
-int64_t strtoint64(const std::string& word) {
+int64_t strtoint64(absl::string_view word) {
   int64_t result;
   CHECK(absl::SimpleAtoi(word, &result));
   return result;
diff --git a/ortools/base/strtoint.h b/ortools/base/strtoint.h
index 9f64d39f87..64fff677a9 100644
--- a/ortools/base/strtoint.h
+++ b/ortools/base/strtoint.h
@@ -45,12 +45,13 @@
 #include <string>
 
 #include "absl/base/port.h"  // disable some warnings on Windows
+#include "absl/strings/string_view.h"
 #include "ortools/base/integral_types.h"
 
 namespace operations_research {
 
-int32_t strtoint32(const std::string& word);
-int64_t strtoint64(const std::string& word);
+int32_t strtoint32(absl::string_view word);
+int64_t strtoint64(absl::string_view word);
 
 // Convenience versions of the above that take a string argument.
 inline int32_t atoi32(const std::string& word) { return strtoint32(word); }
diff --git a/ortools/graph/connected_components.h b/ortools/graph/connected_components.h
index 898a1f16ef..a8bcc512db 100644
--- a/ortools/graph/connected_components.h
+++ b/ortools/graph/connected_components.h
@@ -51,7 +51,6 @@
 #include "absl/meta/type_traits.h"
 #include "ortools/base/logging.h"
 #include "ortools/base/map_util.h"
-#include "ortools/base/ptr_util.h"
 
 namespace util {
 // Generic version of GetConnectedComponents() (see below) that supports other