素数回文

#include <iostream>
#include <string>
#include <cmath>
#include <vector>

using namespace std;

bool isS(int n);//判断素数
bool isP(int n);//判断回文
int main()
{
    vector<int>res;
    int a, b;
    cin >> a >> b;
    for (int i = a; i <= b; i++)
    {
        if (isS(i) && isP(i))
            res.push_back(i);
    }
    int l = res.size();
    for (int i = 0; i < l-1; i++)
    {
        cout << res[i] << "\n";
    }
    cout << res[l-1];
    return 0;
}
bool isS(int n)
{
    int l = (int)sqrt(n);
    for (int i = 2; i <= l; i++)
    {
        if (n % i == 0)
            return false;
    }
    return true;
}

bool isP(int n)
{
    //if n == reverseN return true;
    int reverseN = 0;
    int tmp = n;
    while (tmp > 0)
    {
        reverseN = reverseN * 10 + (tmp % 10);
        tmp /= 10;
    }
    //cout << reverseN << "\n";
    return n == reverseN;
}