报错：将一个无效参数传给了错误函数

Question

C++中调试的时候报错:0x00007FFE903CAFEC (ucrtbased.dll) (Project2.exe 中)处有未经处理的异常: 将一个无效参数传递给了将无效参数视为严重错误的函数。

#include<iostream>
#include<vector>
using namespace std;
vector <int>a;
int main()
{
    int i, teap, j, l;
    i = 0, teap = 0, j = 0, l = 0;
    cout << "请输入数字（100个以内），我将完成排序" << endl;
    for (i = 0; i < j; i++)
    {
        cin >> a[i];
    }
    j = sizeof(a);
    cout << j;
    for (i = 0; i < j; i++)
    {
        for (l = i + 1; l < j; l++)
        {
            if (a[i] < a[l])
            {
                teap = a[l];
                a[l] = a[i];
                a[i] = teap;
            }
        }
    }
    cout << "排序后是：" << endl;
    for (i = 0; i < j; i++)
    {
        cout << a[i] << ">";
    }
    return 0;
}

报错：0x00007FFE903CAFEC (ucrtbased.dll) (Project2.exe 中)处有未经处理的异常: 将一个无效参数传递给了将无效参数视为严重错误的函数。

                                                                          报错页面

Microsoft Visual C++ Runtime Library
Debug Assertion Failed!
Program:D:\C++\C++\Project2\x64\Debug\Project2.exe File: D:\22vs1\VC\Tools\MSVC\14.32.31326\include\vector Line:1732
Expression: vector subscript out of range
For information on how your program can cause an assertion failure, see the Visual C++ documentation on asserts.
(Press Retry to debug the application)
中止(A) 重试(R) 忽略(I)

我想要达到的结果：想要的结果是：声明一个由输入数字的多少来分配内存的数组
哪位可以帮我解决一下，谢谢！

Answer 1

冒泡法，也不是这样玩的啊。