练习作业，哥哥姐姐帮忙看看哪儿有问题。

#include <iostream>
int displayScore(int greenBay, int pittsburgh)
{
if (greenBay > pittsburgh)
{
std::cout << "Green Bay " << greenBay << " Pittsburgh " << pittsburgh << "\n";
}
else
{
std::cout << "Pittsburgh " << pittsburgh << " Green Bay " << greenBay << "\n";
}
}
int main()
{
const int TOUCHDOWN = 6;
const int FIELD_GOAL = 3;
const int EXTRA_POINT = 1;
const int SAFETY = 2;
int greenBay = 0;
int pittsburgh = 0;
greenBay = TOUCHDOWN + EXTRA_POINT + TOUCHDOWN + EXTRA_POINT;
pittsburgh = FIELD_GOAL;
displayScore(greenBay, pittsburgh);
greenBay = greenBay + TOUCHDOWN + EXTRA_POINT;
pittsburgh = pittsburgh + TOUCHDOWN + EXTRA_POINT + TOUCHDOWN + EXTRA_POINT;
displayScore(greenBay, pittsburgh);
greenBay = greenBay + TOUCHDOWN + EXTRA_POINT;
pittsburgh = pittsburgh + TOUCHDOWN + EXTRA_POINT + EXTRA_POINT;
displayScore(greenBay, pittsburgh);
greenBay = greenBay + FIELD_GOAL;
displayScore(greenBay, pittsburgh);
return 0;
}