Fix build errors in remove_copy.pass, find.pass and search_n.pass

Author: rarutyun

test/parallel_api/algorithm/alg.modifying.operations/fill.pass.cpp

@@ -125,7 +125,7 @@ void test_empty_list_initialization_for_fill()
 #if TEST_DPCPP_BACKEND_PRESENT
     std::vector<int> v{3,6,5,4,3,7,8,0,2,4};
     sycl::buffer<int> buf(v);
-    auto it = oneapi::dpl::fill(oneapi::dpl::execution::dpcpp_default, oneapi::dpl::begin(buf), oneapi::dpl::end(buf), {});
+    oneapi::dpl::fill(oneapi::dpl::execution::dpcpp_default, oneapi::dpl::begin(buf), oneapi::dpl::end(buf), {});
     EXPECT_TRUE(std::count(v.begin(), v.end(), 0) == v.size(), "a sequence is not filled properly by oneapi::dpl::fill with `device_policy` policy");
 #endif
 }

test/parallel_api/algorithm/alg.modifying.operations/remove_copy.pass.cpp

@@ -169,7 +169,7 @@ void test_empty_list_initialization()
     sycl::buffer<int> dest_buf(v);
     auto it = oneapi::dpl::remove_copy(oneapi::dpl::execution::dpcpp_default, oneapi::dpl::begin(buf), oneapi::dpl::end(buf), oneapi::dpl::begin(dest_buf), {});
     EXPECT_TRUE(it.get_idx() == 7, "not all empty list-initialized values are properly remove_copy by oneapi::dpl::remove_copy with `device_policy` policy");
-    dest.erase(it, dest.end());
+    dest.erase(dest.begin() + it.get_idx(), dest.end());
     EXPECT_TRUE(dest == expected, "wrong effect from calling oneapi::dpl::remove_copy with empty list-initialized value and with `device_policy` policy");
 #endif
 }

test/parallel_api/algorithm/alg.nonmodifying/search_n.pass.cpp

@@ -137,7 +137,7 @@ void test_empty_list_initialization()
     }
 #if TEST_DPCPP_BACKEND_PRESENT
     sycl::buffer<int> buf(v);
-    auto it = oneapi::dpl::search_n(oneapi::dpl::execution::dpcpp_default, oneapi::dpl::begin(buf), oneapi::dpl::end(buf), {});
+    auto it = oneapi::dpl::search_n(oneapi::dpl::execution::dpcpp_default, oneapi::dpl::begin(buf), oneapi::dpl::end(buf), 4, {});
     EXPECT_TRUE(it.get_idx() == 4, "an empty list-initialized value is not found by oneapi::dpl::search_n with `device_policy` policy");
 #endif
 }