diff --git a/.vscode/settings.json b/.vscode/settings.json
index a506c4d..a702290 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -1,5 +1,4 @@
 {
-    "python.formatting.provider": "yapf",
     "code-runner.runInTerminal": true,
     "code-runner.saveFileBeforeRun": true,
     "code-runner.executorMap": {
diff --git a/xjtu.bmp b/xjtu.bmp
new file mode 100644
index 0000000..84d88cc
Binary files /dev/null and b/xjtu.bmp differ