diff --git a/ex4/ex4.cpp b/ex4/ex4.cpp
new file mode 100644
index 0000000..7f9825e
--- /dev/null
+++ b/ex4/ex4.cpp
@@ -0,0 +1,75 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include "vec.cpp"
+int main()
+{
+    int flag = 0;
+    int temp[5];
+
+    clock_t astart_t, aend_t;
+
+    clock_t bstart_t, bend_t;
+
+    srand(time(NULL));
+    int len;
+    printf("输入秩\n");
+    scanf("%d", &len);
+    printf("生成数组\n");
+    // scanf("%d", &len);
+    Vec a(len,1);
+    Vec b(len,2);
+
+    int amode =0,bmode=0;
+    printf("排序方法 1merge 2bubble\n");
+    scanf("%d %d",&amode,&bmode);
+
+    if(amode==1)
+    {
+        astart_t = clock();
+        a.mergeSort(0,a.getused());
+        aend_t = clock();
+    }
+    else if(amode==2)
+    {
+        astart_t = clock();
+        a.bubbleSort();
+        aend_t = clock();
+    }
+    if(bmode==1)
+    {
+        bstart_t = clock();
+        b.mergeSort(0,a.getused());
+        bend_t = clock();
+    }
+    else if(bmode==2)
+    {   
+        bstart_t = clock();
+        b.bubbleSort();
+        bend_t = clock();
+    }
+    printf("A运算时间: %.4f 秒\n", ((double)(aend_t - astart_t) / CLOCKS_PER_SEC));
+    printf("B运算时间: %.4f 秒\n", ((double)(bend_t - bstart_t) / CLOCKS_PER_SEC));
+
+    printf("输出样本A:\n[0-19]\n");
+    for(int i=0;i<=19;i++)
+        printf("%d\n",a.get(i));
+    printf("[50000-50019]\n");
+    for(int i=50000;i<=50019;i++)
+        printf("%d\n",a.get(i));
+    printf("[99980-99999]\n");
+    for(int i=99980;i<=99999;i++)
+        printf("%d\n",a.get(i));
+
+    printf("输出样本B:\n[0-19]\n");
+    for(int i=0;i<=19;i++)
+        printf("%d\n",b.get(i));
+    printf("[50000-50019]\n");
+    for(int i=50000;i<=50019;i++)
+        printf("%d\n",b.get(i));
+    printf("[99980-99999]\n");
+    for(int i=99980;i<=99999;i++)
+        printf("%d\n",b.get(i));
+
+
+    system("pause");
+}