问下这个程序有什么错误

#include<iostream>
int main()
{
int a = 0 , n = 0 ;
if(std::cin >> a)
{
int i = 1 ;
while(std::cin >> n)
{
if( a == n)
{
++i;
}
else
{
std::cout << a << " occout " <<
i << " times "<<
std::endl;
a = n;
i = 1;
}
}
std::cout << a << " occout " <<
i << " times " <<
std::endl;
}
return 0;
}