55分蒟蒻小学生求助大佬

#include<bits/stdc++.h>
using namespace std;
int a,b,y,y2,m1,m2,d1,d2;
int strtonum(string x){
    if(x.size()==0)
    return 0;
    else
    {stringstream sstream(x);
     int v;
     sstream>>v;
     return v;}
}
string to_string1(int num){
    stringstream sstream;
    string s;
    sstream<<num;
    if((num/100)<10)
    {
        sstream>>s;
        s.insert(0,"0");
    }
    else
    sstream>>s;
    return s;
}

int r(int x){
    return (x%4==0&&x%100!=0||x%400==0)?29:28;

}
bool ishui(int y,int m,int d){
    int c=y*10000+m*100+d;
    int g=c/10000;
    string e;
    e=to_string1(c%10000);  
    reverse(e.begin(),e.end());
    int f=strtonum(e);
    if(f==g)
    return true;
    else 
    {return false;}
}
int main(){ 
int sum=0;
    cin>>a>>b;
    y=a/10000;
    m1=a%10000/100;
    d1=a%100;   
    y2=b/10000;
    m2=b%10000/100;
    d2=b%100;
    while(y<y2||y==y2&&m1<m2||y==y2&&m1==m2&&d1<d2){
        if(ishui(y,m1,d1))
        {sum++;}
        if(m1==12&&d1==31)
        {m1=1;d1=0;y++;}
        if(m1==2&&d1==r(m1)||((m1==1||m1==3||m1==5||m1==7||m1==8||m1==10)&&d1==31)||((m1==4||m1==6||m1==9||m1==11)&&d1==30))
           {
            m1++;d1=0;
           } 
           d1++; 
    }
    if(a==b)
    {if(sum>0)
    sum=1;
    else
    sum=0;
    }
    cout<<sum<<endl;
    return 0;
}