反轉==本身
#include<iostream>
#include<vector>
using namespace std;
int main()
{
for(int i = 1000; i < 10000; i++)
{
int tmp = i;
int tmp2 = 0;
int cnt2 = 0;
while(tmp > 0)
{
int t = tmp%10;
tmp /= 10;
tmp2 = tmp2 * 10 + t;
}
if(tmp2 == i)
{
cout<<i<<endl;
}
}
return 0;
}