嗯格式很标准

#include <iostream>
using namespace std;
int main()
{
int a, b, c;
cin >> a >> b >> c;
if (a > 0)
{
cout << a << endl;
}
if (b > 0)
{
cout << b << endl;
}
if (c > 0)
{
cout << c;
}
return 0;
}