diff --git a/.vscode/settings.json b/.vscode/settings.json
index 1489981..e627288 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -11,6 +11,7 @@
         "streambuf": "cpp",
         "tuple": "cpp",
         "system_error": "cpp",
-        "xtr1common": "cpp"
+        "xtr1common": "cpp",
+        "limits": "cpp"
     }
 }
\ No newline at end of file
diff --git a/Algorithm/BubbleSort.h b/Algorithm/BubbleSort.h
index c787fcb..3270519 100644
--- a/Algorithm/BubbleSort.h
+++ b/Algorithm/BubbleSort.h
@@ -1,5 +1,7 @@
 // 冒泡排序
 void BubbleSort(vector<int>& v) {
+	if (v.size() <= 0)
+		return;
 	int temp;
 	for (int i = 0; i < v.size() - 1; ++i) {
 		for (int j = 0; j < v.size() - 1 - i; ++j) {
diff --git a/Algorithm/BubbleSort_orderly.h b/Algorithm/BubbleSort_orderly.h
index 5c39409..91ef293 100644
--- a/Algorithm/BubbleSort_orderly.h
+++ b/Algorithm/BubbleSort_orderly.h
@@ -1,5 +1,7 @@
 // 冒泡排序（改进版）
 void BubbleSort_orderly(vector<int>& v) {
+	if (v.size() <= 0)
+		return;
 	int temp;
 	bool orderly = false;
 	for (int i = 0; i < v.size() - 1 && !orderly; ++i) {
diff --git a/Algorithm/SelectionSort.h b/Algorithm/SelectionSort.h
index d9c7b1e..3f3c70c 100644
--- a/Algorithm/SelectionSort.h
+++ b/Algorithm/SelectionSort.h
@@ -1,5 +1,7 @@
 // 选择排序
 void SelectionSort(vector<int>& v) {
+	if (v.size() <= 0)
+		return;
 	int min, temp;
 	for (int i = 0; i < v.size() - 1; ++i) {
 		min = i;