diff --git a/.gitignore b/.gitignore
index 06118c2..a8b8ceb 100644
--- a/.gitignore
+++ b/.gitignore
@@ -34,3 +34,5 @@
 *.out
 *.app
 
+tempCodeRunnerFile
+tempCodeRunnerFile.cpp
diff --git a/day2/排序相关问题探究.pptx b/day2/排序相关问题探究.pptx
new file mode 100644
index 0000000..c91b459
Binary files /dev/null and b/day2/排序相关问题探究.pptx differ
diff --git a/day3/T490194/chat.cpp b/day3/T490194/chat.cpp
index 723017b..8dd18c7 100644
--- a/day3/T490194/chat.cpp
+++ b/day3/T490194/chat.cpp
@@ -1,7 +1,4 @@
-#include <iostream>
-#include <vector>
-#include <set>
-#include <algorithm>
+#include<bits/stdc++.h>
 
 using namespace std;