80分求助 #8 #10WA

#include<bits/stdc++.h>

using namespace std;

int d1,d2,ans=0; 
int nb[4] = {0};

int cnm(int n){
    int a = n/1000 + n/100%10*10 + n/10%10*100 + n%10*1000;
        nb[0] = a/1000;
        nb[1] = a/100%10;
        nb[2] = a/10%10;
        nb[3] = a%10;
    return a;
}

int main(){
    cin>>d1>>d2;
    int y1=d1/10000;
    int y2=d2/10000;
    for(int i=y1;i<=y2;i++){
        int a = cnm(i);
        int fuck = i*10000+a;
        if(fuck >= d1 and fuck <= d2 and nb[0]*10 + nb[1] <=12){
            if(nb[1] == 1 or nb[1] == 3 or nb[1] == 5 or nb[1] == 7 or nb[1] == 8 or (nb[0] == 1 and nb[1] == 0) or (nb[0] == 1 and nb[1] == 2)){
            if(nb[2]*10+nb[3] <= 31){
                ans++;
            }
        }
        else if(nb[1] == 4 or nb[1] == 6 or nb[1] == 9 or (nb[0] == 1 and nb[1] == 1)){
            if(nb[2]*10+nb[3] <= 30){
                ans++;
            }
        }
        else if(nb[1] == 2){
            if((i%4 == 0 and i%100 != 0) or i%400==0){
                if(nb[2]*10+nb[3] <= 29){
                ans++;
                }
            }
            else{
                if(nb[2]*10+nb[3] <= 28){   
                ans++;
                }
            }

        }
        }

    }
    cout<<ans;
    return 0;
}

可能有点乱 大佬见谅