有佬可以帮我看一下吗,有一个点一直过不了

#include <iostream>
#include <string>
using namespace std;

bool isPalindrome(const string &date) {
    return date == string(date.rbegin(), date.rend());
}

bool isABABBABA(const string &date) {
    return date[0] == date[2] && date[1] == date[3] && date[0] != date[1];
}

bool isValidDate(const string &date) {
    if(date.size()>8){
        return false;
    }
    int year = stoi(date.substr(0, 4));
    int month = stoi(date.substr(4, 2));
    int day = stoi(date.substr(6, 2));

    if (year < 1000 || year > 9999 || month < 1 || month > 12 || day < 1 || day > 31) {
        return false;
    }

    if (month == 2) {
        if ((year % 4 == 0 && year % 100 != 0) || (year % 400 == 0)) {
            if (day > 29) {
                return false;
            }
        } else {
            if (day > 28) {
                return false;
            }
        }
    } else if (month == 4 || month == 6 || month == 9 || month == 11) {
        if (day > 30) {
            return false;
        }
    }else{
        if(day>31){
            return false;
        }
    }

    return true;
}

string nextDate(const string &date) {
    int year = stoi(date.substr(0, 4));
    int month = stoi(date.substr(4, 2));
    int day = stoi(date.substr(6, 2));

    while (true) {
        if(year%400==0 || year%4==0 && year%100!=0){
            if (++day > 31 || (month == 2 && day > 28) || ((month == 4 || month == 6 || month == 9 || month == 11) && day > 30)) {
                day = 1;
                if (++month > 12) {
                    month = 1;
                    year++;
                }
            } 
        }else{
            if (++day > 31 || (month == 2 && day > 29) || ((month == 4 || month == 6 || month == 9 || month == 11) && day > 30)) {
                day = 1;
                if (++month > 12) {
                    month = 1;
                    year++;
                }
            }
        }
        if (month < 10 && day < 10) {
            return to_string(year) + "0" + to_string(month) + "0" + to_string(day);
        } else if (month < 10) {
            return to_string(year) + "0" + to_string(month) + to_string(day);
        } else if (day < 10) {
            return to_string(year) + to_string(month) + "0" + to_string(day);
        } else if (month < 13 && day < 32) {
            return to_string(year) + to_string(month) + to_string(day);
        }
    }
}

int main() {
    string date;
    cin >> date;

    if (!isValidDate(date)) {
        return 0;
    }

    string nextPalinDate = nextDate(date);
    while (!isPalindrome(nextPalinDate)) {
        nextPalinDate = nextDate(nextPalinDate);
    }

    string nextABPalinDate = nextDate(nextPalinDate);
    while (!(isABABBABA(nextABPalinDate) && isPalindrome(nextABPalinDate))) {
        nextABPalinDate = nextDate(nextABPalinDate);
    }
    if(isValidDate(nextPalinDate)){
        cout << nextPalinDate << endl;
    }
    if(isValidDate(nextABPalinDate)){
        cout << nextABPalinDate << endl;
    }
    
    return 0;
}