diff --git a/.gitignore b/.gitignore
index 5998c9a..20401ae 100644
--- a/.gitignore
+++ b/.gitignore
@@ -11,13 +11,14 @@
 # HelloWrold.class
 AStyle.exe
 *.orig
+*/result.txt
+xy.txt
 
 # 忽略指定文件夹
 build/
 */bin/
-*/result.txt
 */__pycache__/
 .vs/
 .vscode/
 */x64/
-*/Debug/
\ No newline at end of file
+*/Debug/
diff --git a/common/clock.cuh b/common/clock.cuh
index 8b3b4eb..4865797 100644
--- a/common/clock.cuh
+++ b/common/clock.cuh
@@ -29,5 +29,5 @@ using namespace std::chrono;
 
 #define cppClockCurr                                                               \
     tStop = system_clock::now();                                                   \
-    t = duration<double, std::milli>(tStart - tStop).count();                      \
+    t = duration<double, std::milli>(tStop - tStart).count();                      \
     printf("cpp time cost: %f ms.\n", t);                                          \