大神看一下为什么错了？（我是新手，大神莫喷）

#include<iostream>
using namespace std;
int m,n,a[101],b[101]={1},c[101],d[101],v[13]={0,31,28,31,30,31,30,31,31,30,31,30,31},cun[101];
int run(int year)
{
    if(year%4==0&&year%100!=0)
    return 1;
    else
    if(year%400==0)
    return 1;
    else
    return 0;
}
int panhui(int year,int month,int date)
{    int bu=0,sum=0;
    if(date<10)
    {
    cun[1]=date;
    cun[2]=bu;
    }
    else
    {
    cun[1]=date%10;
    date/=10;
    cun[2]=date%10;
  }
  if(month<10)
  {
        cun[3]=month;
        cun[4]=bu;
  }
  else
  {
        cun[3]=month%10;
        month/=10;
        cun[4]=month%10;
  }
  int sum_;
  sum_=cun[1]*1000+cun[2]*100+cun[3]*10+cun[4];
  if(sum_==year)
        return 1;
        else
        return 0;
}
void dfs()
{   
    for(int i=1;i<=2;i++)
    {
        c[i]=m%10;
        d[i]=n%10;
        m/=10;
        n/=10;
    }
    a[3]=c[1]+c[2]*10;
    b[3]=d[1]+d[2]*10;
    for(int i=1;i<=2;i++)
    {
        c[i]=m%10;
        d[i]=n%10;
        m/=10;
        n/=10;
    }
    a[2]=c[1]+c[2]*10;
    b[2]=d[1]+c[2]*10;
    for(int i=1;i<=4;i++)
    {
        c[i]=m%10;
        d[i]=n%10;
        m/=10;
        n/=10;
    }
    a[1]=c[1]+c[2]*10+c[3]*100+c[4]*1000;
    b[1]=d[1]+d[2]*10+d[3]*100+c[4]*1000;
    int sum=0;
    if(run(a[1])==1)
    v[2]=29;
    if(a[1]==b[1]&&a[2]==b[2]&&a[3]==b[3])
    {
        if(panhui(a[1],a[2],a[3])==1)
        sum++;
    }
    else
    {
    while(a[1]!=b[1]&&a[2]!=b[2]&&a[3]!=b[3])
        if(a[2]<=12){
        if(a[3]<=v[a[2]])
        {
        if(panhui(a[1],a[2],a[3])==1)
        sum++;
        a[3]++;
        }
        else
        {
            a[3]=1;
            a[2]++;
        }
    }
    else
    {
    a[2]=1;
    a[1]++;
    a[3]=1;
    if(run(a[1])==1)
    v[2]=29;
    else
    v[2]=28;    
    }
    }
    cout<<sum;
    }
int main()
{
cin>>m>>n;
dfs();
}