c++,list里面内容，不知错在哪里，求解答

#include "stdafx.h"
#include 
#include
//#include
#include 
using namespace std;
void unio(list &la, list lb);
typedef list intlist;
int main()
{
intlist LA = {3,5,8,11};
intlist LB = { 2,6, 8, 9,11,15,20 };
unio(LA,LB);
intlist::iterator it;
for (it = LA.begin(); it != LA.end(); it++)
cout << *it << " " << endl;
system("pause");
return 0;
}
void unio(intlist &la, intlist lb)
{
auto la_len = la.size();
auto lb_len = lb.size();
intlist::iterator rit;
for (rit = lb.begin(); rit != lb.end();rit++)
{
intlist::iterator it = find(la.begin(),la.end(),rit);
if (!*it)
{
la.push_back(*rit);
}
}
}

错误 1 error C2678: 二进制“==”: 没有找到接受“int”类型的左操作数的运算符(或没有可接受的转换) c:program files (x86)microsoft visual studio 12.0vcincludexutility 3026 1 table
报了这样的错误，求大神解答