求助...只对了两个

#include<bits/stdc++.h>
using namespace std;

int a[1001] = {0};

bool rn(int x){
    if(x%4 == 0){
        return 1;
    }
    if(x%100==0 && x%400!=0){
        return 1;
    }
    return 0;
}

int main()
{
    int x, y;
    cin >> x >> y;
    int c = 0;
    for(int i=x; i<=y; i++){
        if(rn(i) == 1){
            c += 1;
            a[c] = i;
        }
    }

    cout << c << "\n";
    for(int i=1; i<=c; i++){
        cout << a[i] << " ";
    }

    return 0;
}