using namespace std; int main() {
set<int> myset;
for (int i = 1; i <= 10; i++) {
myset.insert(i);
}
for (int i = 1; i <= 9; i++)
{
int a;
cin >> a;
myset.erase(a); //删除集合中的元素
}
for (int num : myset) //遍历输出元素
{
cout <<"The missing integer is:" << num;
}
system("pause");
return 0;
}