ClangTidy fixes
Change-Id: I8d1a0258fc586040bd1cb5cc6131fdad2fe134eb
diff --git a/examples/bundle_adjuster.cc b/examples/bundle_adjuster.cc
index 5b25d6f..2038885 100644
--- a/examples/bundle_adjuster.cc
+++ b/examples/bundle_adjuster.cc
@@ -65,6 +65,7 @@
#include "absl/log/check.h"
#include "absl/log/initialize.h"
#include "absl/log/log.h"
+#include "absl/time/clock.h"
#include "absl/time/time.h"
#include "bal_problem.h"
#include "ceres/ceres.h"
diff --git a/internal/ceres/problem_impl.cc b/internal/ceres/problem_impl.cc
index fb6f254..ef5851b 100644
--- a/internal/ceres/problem_impl.cc
+++ b/internal/ceres/problem_impl.cc
@@ -40,6 +40,7 @@
#include <utility>
#include <vector>
+#include "absl/container/btree_map.h"
#include "absl/container/fixed_array.h"
#include "absl/log/check.h"
#include "absl/log/log.h"
diff --git a/internal/ceres/visibility.cc b/internal/ceres/visibility.cc
index 38fc6d9..bb3314d 100644
--- a/internal/ceres/visibility.cc
+++ b/internal/ceres/visibility.cc
@@ -38,6 +38,7 @@
#include <vector>
#include "absl/container/btree_set.h"
+#include "absl/container/flat_hash_map.h"
#include "absl/log/check.h"
#include "absl/log/log.h"
#include "ceres/block_structure.h"
