diff --git a/ex3/ex3.cpp b/ex3/ex3.cpp
index 832a96e..c7463ff 100644
--- a/ex3/ex3.cpp
+++ b/ex3/ex3.cpp
@@ -1,8 +1,54 @@
 #include <stdio.h>
 #include <stdlib.h>
+#include "vec.cpp"
 int main()
 {
-    printf("娴嬭瘯");
+    int flag = 0;
+    int temp[5];
+
+    srand(time(NULL));
+    int len;
+    printf("输入生成数量\n");
+    scanf("%d", &len);
+    Vec v(len);
+    v.printall();
     system("pause");
+    printf("排序\n");
+    v.sort();
+    v.printall();
+    while (1)
+    {
+        printf("选择操作:1.插入 2.删除 3.统计\n");
+        scanf("%d", &flag);
+
+        switch (flag)
+        {
+        case 1:
+            printf("输入待插入数值\n");
+            scanf("%d", &temp[0]);
+            (v.insert(v.search(temp[0]), temp[0]) != -1) ? (printf("输出数组\n")) : (printf("无此元素或超出范围\n"));
+            v.printall();
+            break;
+
+        case 2:
+            printf("输入待删除元素\n");
+            scanf("%d", &temp[0]);
+            (v.remove_sorted(temp[0]) != -1) ? (printf("输出数组\n")) : (printf("无此元素或超出范围\n"));
+            v.printall();
+            break;
+
+        case 3:
+            printf("输入统计的数值\n");
+            scanf("%d", &temp[0]);
+            temp[1] = v.count(temp[0]);
+
+            (temp[1] != -1) ? (printf("一共%d个\n", temp[1])) : (printf("无此元素或超出范围\n"));
+            break;
+
+        default:
+            printf("返回菜单\n");
+        }
+        flag = 0;
+    }
     return 0;
 }
\ No newline at end of file
diff --git a/ex3/vec.cpp b/ex3/vec.cpp
new file mode 100644
index 0000000..67428b8
--- /dev/null
+++ b/ex3/vec.cpp
@@ -0,0 +1,191 @@
+#include "vec.h"
+
+Vec::Vec(int len)
+{
+    _used = len - 1;
+    _len = len * 2;
+    _v = new int[_len];
+
+    // for (int i = 0; i <= _used; i++)
+    //     _v[i] = i + 1;
+
+    for (int i = 0; i <= _used; i++)
+        _v[i] = rand() % (_used + 1);
+
+    for (int i = 0; i <= _used; i++)
+        swap(i, rand() % (_used + 1));
+}
+
+int Vec::get(int a)
+{
+    return _v[a];
+}
+
+void Vec::put(int a, int value)
+{
+    _v[a] = value;
+}
+
+void Vec::swap(int a, int b)
+{
+    int temp = _v[a];
+    _v[a] = _v[b];
+    _v[b] = temp;
+}
+
+void Vec::expand()
+{
+    _len = _len * 2;
+    int *p = new int[_len];
+
+    for (int i = 0; i <= _used; i++)
+        p[i] = _v[i];
+
+    delete[] _v;
+    _v = p;
+}
+
+void Vec::shrink()
+{
+    if (((double)_used / (double)_len) >= 0.25)
+        return;
+
+    _len = _len >> 1;
+    int *p = new int[_len];
+
+    for (int i = 0; i <= _used; i++)
+        p[i] = _v[i];
+
+    delete[] _v;
+    _v = p;
+}
+//位置 数值
+int Vec::insert(int locate, int value)
+{
+    if (locate < 0 || locate > _used)
+        return -1;
+
+    _used++;
+
+    if (_used >= _len)
+        expand();
+
+    for (int i = _used; i > locate; i--)
+        _v[i] = _v[i - 1];
+
+    _v[locate] = value;
+
+    return 0;
+}
+
+//位置 删除个数
+int Vec::remove(int locate, int value)
+{
+
+    if (locate < 0 || ((_used - value) < 0) || ((locate + value - 1) > _used))
+        return -1;
+
+    _used = _used - value;
+
+    for (int i = locate; i <= _used; i++)
+        _v[i] = _v[i + value];
+
+    shrink();
+
+    return value;
+}
+
+//删除某一元素
+int Vec::remove_sorted(int value)
+{
+    int j, i;
+
+    for (i = 0; i <= _used && _v[i] != value; i++)
+        ;
+
+    for (j = 1; _v[i + j] == value; j++)
+        ;
+
+    return remove(i, j);
+}
+
+int Vec::count(int value)
+{
+    int j, i;
+
+    for (i = 0; i <= _used && _v[i] != value; i++)
+        ;
+
+    for (j = 0; _v[i + j] == value && i + j <= _used; j++)
+        ;
+
+    if (j == 0)
+        return -1;
+
+    return j;
+}
+
+int Vec::find(int value)
+{
+    int i = 0;
+    for (i; i <= _used; i++)
+    {
+        if (_v[i] == value)
+        {
+            return i;
+        }
+    }
+
+    return -1;
+}
+
+int Vec::getlen()
+{
+    return _len;
+}
+
+int Vec::getused()
+{
+    return _used;
+}
+
+void Vec::printall()
+{
+    for (int i = 0; i < _used; i++)
+        printf("%d\n", _v[i]);
+}
+
+void Vec::sort()
+{
+    int n = _used;
+    bool sorted = false;
+
+    while (!sorted)
+    {
+        sorted = true;
+
+        for (int i = 1; i < n; i++)
+        {
+            if (_v[i - 1] > _v[i])
+            {
+                swap(i - 1, i);
+
+                sorted = false;
+            }
+        }
+        n--;
+    }
+    _sorted = true;
+}
+
+int Vec::search(int e)
+{
+    if (_sorted == false)
+        return -1;
+
+    int i = 0;
+    for (i; i <= _used && _v[i] <= e; i++)
+        ;
+
+    return i - 1;
+}
\ No newline at end of file
diff --git a/ex3/vec.h b/ex3/vec.h
new file mode 100644
index 0000000..0e8cb6e
--- /dev/null
+++ b/ex3/vec.h
@@ -0,0 +1,54 @@
+#ifndef _INC_STDIO
+#include <stdio.h>
+#endif
+
+#ifndef _GLIBCXX_STDLIB_H
+#include <stdlib.h>
+#endif
+
+#include <time.h>
+
+class Vec
+{
+private:
+  int *_v;
+  int _len;
+  int _used;
+  bool _sorted = false;
+
+  void expand();
+
+  void shrink();
+
+public:
+  Vec(int _len);
+
+  int get(int a);
+
+  int search(int value);
+
+  void put(int a, int value);
+
+  void swap(int a, int b);
+
+  int insert(int locate, int value);
+
+  int remove(int locate, int value);
+
+  int remove_sorted(int value);
+
+  int find(int value);
+
+  void sort();
+
+  void printall();
+
+  int getlen();
+
+  int getused();
+
+  int count(int value);
+};
+
+
+