C++ set 컨테이너를 사용하려고 하는데 원인불명의 에러가 납니다.

#include <iostream>
#include <set>
#include <string>
#include <algorithm>
using namespace std;
 
class President
{
public:
     int Id;
     string Name;
     string Addr;
 
     President(int aId,char *aName, char *aAddr)
          : Id(aId), Name(aName), Addr(aAddr) { }
     void OutPresident() {
          printf("Id:%d, 이름:%s, 주소:%s\n",Id,Name.c_str(),Addr.c_str());
     }
     bool operator<(const President &Other) const {
          return Id < Other.Id;
     }
     bool operator==(const President &Other) {
          return (Id==Other.Id && Name==Other.Name && Addr==Other.Addr);
     }
};
 
void main()
{
     set<President> King;
     King.insert(President(516,"박정희","동작동"));
     King.insert(President(1212,"전두환","연희동"));
     King.insert(President(629,"노태우","강북"));
     King.insert(President(3030,"김영삼","상도동"));
     King.insert(President(1234,"김대중","강남"));
 
     set<President>::iterator it;
     for (it=King.begin();it!=King.end();it++) {
          (*it).OutPresident();
     }
     President ZeroThree(3030,"아무개","아무데나");
     it=King.find(ZeroThree);
     if (it != King.end()) {
          cout << "검색되었음" << endl;
          (*it).OutPresident();
     }
     it=find(King.begin(),King.end(),ZeroThree);
     if (it != King.end()) {
          cout << "검색되었음" << endl;
          (*it).OutPresident();
     }
}