diff --git a/T4insert.cpp b/T4insert.cpp
new file mode 100644
index 0000000..0a236ae
--- /dev/null
+++ b/T4insert.cpp
@@ -0,0 +1,52 @@
+²εΘλ
+#include <stdio.h>
+int main()
+{
+	struct stud
+	{
+		int num;
+		int clas;
+		float math;
+		float phy;
+		float eng;
+	}t={};
+	struct stud stu[100];
+	stu[0]={10001,11,99.5,88.5,89.5};
+	stu[1]={10002,12,77.9,56.5,87.5};
+	stu[2]={10003,11,92.5,99.0,60.5};
+	scanf("%d %d %f %f %f",&stu[3].num,&stu[3].clas,&stu[3].math,&stu[3].phy,&stu[3].eng);
+	int i,j;
+	for(i=0;stu[i+2].num!=0;i++)
+	{
+		if(stu[3].num==stu[i].num)stu[3]=t;
+	}
+	for(i=0;stu[i].num!=0;i++)
+	{
+		if(stu[i+1].num!=0)
+		{
+			for(j=i+1;stu[j].num!=0;j++)
+			{
+				if(stu[i].num>stu[j].num)
+				{
+					t=stu[i];stu[i]=stu[j];stu[j]=t;
+				}
+			}
+		}
+	}
+	for(i=0;stu[i].num!=0;i++)
+	{
+		if(stu[i+1].num!=0)
+		{
+			for(j=i+1;stu[j].num!=0&&stu[i].clas==stu[j].clas;j++)
+			{
+				if(stu[i].math+stu[i].phy+stu[i].eng<stu[j].math+stu[j].phy+stu[j].eng)
+				{
+					t=stu[i];stu[i]=stu[j];stu[j]=t;
+				}
+			}
+		}
+	}
+	for(i=0;stu[i].num!=0;i++)
+	printf("%d %d %3.1f %3.1f %3.1f\n",stu[i].num,stu[i].clas,stu[i].math,stu[i].phy,stu[i].eng);
+	return 0;
+}