C++代码

#include <iostream>
#include <cstdio>

using namespace std;

int m, n;
int res;

bool judge_date(int year, int month, int day)
{
    int k[13] = {0, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};

    if(month < 1 || month > 12) return false;
    if(day < 1 || day > k[month]) return false;
    if(!((year % 100 != 0 && year % 4 == 0) || year % 400 == 0))
        if(month == 2 && day > 28) return false;
    return true;
}
//枚举所有回文日期:
int main()
{
    cin >> m;
    cin >> n;
    for(int i = m / 10000; i <= n / 10000; i ++)
    {
        int x = i;
        int t = x;
        while(x){
            t *= 10;
            t += x % 10;
            x /= 10;
        }
        int year = i, month = (t / 100) % 100, day = t % 100;
        if(t >= m && t <= n)
            if(judge_date(year, month, day)) res ++;
    }

    cout << res << endl;
    return 0;
}