50 pts

#include<bits/stdc++.h>//pal
#define int long long
using namespace std;
int n1,n2,y11,y2,t1,t2,cnt=0;
char a,b,c,d,e,f,g,h;
int my[20]{0,31,-1,31,30,31,30,31,31,30,31,30,31};
bool check1(int x){
    if(x%4==0&&x%100!=0) return 1;
    else if(x%400==0) return 1;
    else return 0; 
} 
bool check2(int x){
    int num=0,T=x;
    while(x){
        num=num*10+x%10;
        x/=10;
    }   
    if(num==T) return true;
    else return false;
}
int pj(int x,int y,int z){
    int ans=0;
    ans+=x;
    ans*=100;
    ans+=y;
    ans*=100;
    ans+=z;
    return ans;
}
signed main(){
    freopen("pal.in","r",stdin);
    freopen("pal.out","w",stdout);
    cin>>a>>b>>c>>d>>e>>f>>g>>h;
    n1=((a-'0')*1000+(b-'0')*100+(c-'0')*10+(d-'0'));
    y11=((e-'0')*10+(f-'0'));
    t1=((g-'0')*10+(h-'0'));
    cin>>a>>b>>c>>d>>e>>f>>g>>h;
    n2=((a-'0')*1000+(b-'0')*100+(c-'0')*10+(d-'0'));
    y2=((e-'0')*10+(f-'0'));
    t2=((g-'0')*10+(h-'0'));
    //cout<<n1<<" "<<n2<<" "<<y11<<" "<<y2<<" "<<t1<<" "<<t2<<"\n";
    for(int i=n1;i<=n2;){
        for(int j=y11;;){
            if(j==13){
                j=1;
                i++;
            }
            if(j==2) my[2]=check1(i)?29:28;
            for(int k=t1;;k++){
                if(i==n2&&j==y2&&k==t2){
                    cout<<cnt;
                    return 0;
                }
                if(k>my[j]){
                    j++;
                    k=1;
                    break;
                }
                if(check2(pj(i,j,k))){
                    cnt++;
                }
            }
        }
    } 
    return 0;
}

另外变量TMD y1本地编译可以，洛谷CE......