int arr[] = {a}中报错Error] invalid conversion from “int*“ to “int“ [-fpermissive]

我是小白，有没有哪位大神帮我看看，源码：

#include <iostream>
#include <map>
using namespace std;
int ListCleanUp(int* a)
{
    int arr[] = {a};
    map<int,int> mp;
    for(int i = 0; i < 3; i++)
    {
        mp[arr[i]]++;
    }
    for(map<int,int>::iterator it = mp.begin ();it!=mp.end ();it++)
    {
        cout << it->first << "{" << it->second << "}" << " ";
    }
    return 0;
}

报错：

---

[Error] invalid conversion from 'int*' to 'int' [-fpermissive]

万分感谢！！！