这种题得多细心呀，看到不通过才知道debug，这到比赛咋行哦

#include<bits/stdc++.h>

using namespace std;

int tmp,l,r,cnt;

bool check(int n)
{
    int y=n/10000;
    int m=n/100%100;
    int d=n%100;
    //cout<<y<<' '<<m<<' '<<d<<endl;
    int dd[]={0,31,28,31,30,31,30,31,31,30,31,30,31};
    if(m>12||m==0) return false;
    if(d==0||d>31) return false;
    if(m!=2&&d>dd[m]) return false;
    if(m==2)
    {
        if((y%4==0&&y%100!=0)||(y%400==0))
        {
            if(d>29) return false;
        }
        else
        {
            if(d>28) return false;
        }
    }
    return true;
}

bool check2(int n)
{
    int y=n/10000;
    int ll=y/100;
    int rr=y%100;
    int lll=ll/10;
    int rrr=ll%10;
    if(ll==rr&&lll!=rrr) return true;
    else return false;
}

int var(int n)
{
    int a,b,c,d;
    a=n/1000;
    b=n/100%10;
    c=n/10%10;
    d=n%10;
    return a+b*10+c*100+d*1000;
}

int main()
{
    cin>>tmp;
    r=tmp%10000;
    l=tmp/10000;
    for(int i=l;i<=9999;i++)
    {
        int n=i*10000+var(i);
        if(n<=tmp) continue;
        if(check(n))
        {
            if(cnt==0)
            {cout<<n<<endl;cnt++;}
            if(check2(n))
            {cout<<n<<endl;break;}
        }
    }
    return 0;
}