哪错了

#include<bits/stdc++.h>
using namespace std;
int main()
{
    ios::sync_with_stdio(false);
    long long x,y,s=0,a[1001];
    cin>>x>>y;
    long long i;
    for(i=x;i<=y;i++)
    {
        if(i%4==0&&i%100!=0)
        {
            s+=1;
            a[i]=i;
        }
        else if(i%100==0&&i%400==0)
        {
            s+=1;
            a[i]=i;
        }
        else
        {
            continue;
        }
    }
    cout<<s<<"\n";
    for(i=x;i<=y;i++)
    {
        cout<<a[i]<<" ";
    }
}