diff --git a/t4.c b/t4.c
deleted file mode 100644
index 4d12658..0000000
--- a/t4.c
+++ /dev/null
@@ -1,74 +0,0 @@
-#include <stdio.h>
-int num[4], Class[4];
-float Maths[4], Physics[4], English[4], sum[4];
-void Swap(int k);
-void insert_array();
-int main()
-{
-    insert_array();
-}
-void insert_array()
-{
-    for (int i = 0; i < 3; i++)
-    {
-        scanf("%d%d%f%f%f\n", &num[i], &Class[i], &Maths[i], &Physics[i], &English[i]);
-        sum[i] = Maths[i] + Physics[i] + English[i];
-    }
-    scanf("%d%d%f%f%f", &num[3], &Class[3], &Maths[3], &Physics[3], &English[3]);
-    for (int i = 0; i < 3; i++)
-    {
-        if (num[i] == num[3])
-        {
-            printf("The student's info has already existed!\n");
-            return;
-        }
-    }
-    int inserted_num = num[3];
-    sum[3] = Maths[3] + Physics[3] + English[3];
-    for (int i = 0; i < 4; i++)
-    {
-        for (int j = 3; j > i; j--)
-        {
-            if (Class[j] < Class[j - 1])
-            {
-                Swap(j);
-            }
-            else if (Class[j] == Class[j - 1])
-            {
-                if (sum[j] > sum[j - 1])
-                {
-                    Swap(j);
-                }
-            }
-        }
-    }
-    for (int i = 0; i < 4; i++)
-    {
-        if (num[i] == inserted_num)
-        {
-            printf("%d %d %.1f %.1f %.1f", num[i], Class[i], Maths[i], Physics[i], English[i]);
-            printf(" inserted\n");
-        }
-        else
-        {
-            printf("%d %d %.1f %.1f %.1f\n", num[i], Class[i], Maths[i], Physics[i], English[i]);
-        }
-    }
-}
-void Swap(int k)
-{
-    int num0 = num[k], Class0 = Class[k];
-    float Maths0 = Maths[k], Physics0 = Physics[k], English0 = English[k], sum0 = sum[k];
-    num[k] = num[k - 1];
-    Class[k] = Class[k - 1];
-    Maths[k] = Maths[k - 1];
-    Physics[k] = Physics[k - 1];
-    English[k] = English[k - 1];
-    sum[k] = sum[k - 1];
-    num[k - 1] = num0;
-    Class[k - 1] = Class0;
-    Maths[k - 1] = Maths0;
-    Physics[k - 1] = Physics0;
-    English[k - 1] = English0;
-    sum[k - 1] = sum0;
-}
\ No newline at end of file