C++ 代码

#include<iostream>
#include<sstream>
#include<algorithm>

using namespace std;

int n;
int huiwenGet,abbaGet;
int huiwenNum,abbaNum;

void huiwen (int n){
    int N;
    N=n;

    stringstream ss;    //stringstream 任意类型吐进来，任意类型吐出去，太棒了
    ss<<n;
    string huiwenStr;
    ss>>huiwenStr;

    if(huiwenStr[0]==huiwenStr[7]&& //没有卵用的枝减
    huiwenStr[1]==huiwenStr[6]&&
    huiwenStr[2]==huiwenStr[5]&&
    huiwenStr[3]==huiwenStr[4]){

        string huiwenBack=huiwenStr.substr(4);  //截取后半段
        huiwenBack=string(huiwenBack.rbegin(),huiwenBack.rend());   //反转 reverse 用不起，本笨蛋不知道为什么
        string huiwenHead=huiwenStr.substr(0,4);    //取出前半段

        if(!huiwenBack.compare(huiwenHead)){
            if(huiwenGet==0){
                huiwenGet=1;
                huiwenNum=N;
            }
        }
    }
}

void abba(int n){   //判断第二种情况
    int N;
    N=n;

    stringstream ss;
    ss<<n;

    string abbaStr;
    ss>>abbaStr;

    if(abbaStr[0]==abbaStr[2]&&
       abbaStr[0]==abbaStr[5]&&
       abbaStr[0]==abbaStr[7]&&
       abbaStr[1]==abbaStr[3]&&
       abbaStr[1]==abbaStr[4]&&
       abbaStr[1]==abbaStr[6]&&
       abbaStr[0]!=abbaStr[1]){
            abbaGet=1;
            abbaNum=N;
       }
}

int months[13]={0,31,28,31,30,31,30,31,31,30,31,30,31}; //之前少写了一个月，起码耽误了半小时

bool leap_year (int year,int month,int day){    //闰年判断
    if(year%400==0||(year%100==0&&year%4==0))return true;
    return false;
}

bool check(int n){  //检查日期合法性
    int year=n/10000;
    int month=(n%10000)/100;
    int day=n%100;

    if(month==2&&leap_year(year,month,day)==true&&day>=29)return false;
    else if(day>months[month])return false;
    else if(day>31)return false;
    else if(month>13||month==0)return false;

    return true;
}

int main(){
    cin>>n;

    for(int i=n+1;i<=99999999;i++){
        if(huiwenGet==1&&abbaGet==1)break; //两种类型都找到了就提前结束
        if(check(i)==false)continue;
        huiwen(i);
        abba(i);
    }

    cout<<huiwenNum<<endl;
    cout<<abbaNum;

    return 0;
}

刚开始没有想起来判断判断日期合法性这个条件，一个人在那里疯狂枝剪还是超时。
耽误了很久，写了很长，还看了眼题解了解怎么过的时间，在下真是废得出奇。

int to string,string to int ，太过不熟练，妈的