我的输出和样例的一模一样，然后复制了个题解，生成了几个数据都一样，为什么会WA？

#include<bits/stdc++.h>
#define MAX 345
using namespace std;

bool pd(int year) {
	if( !(year % 400)||!(year % 4)&&year%100)
		return true;
	return false;
}



int main() {
#ifndef ONLINE_JUDGE
	freopen("run.in" ,"r" , stdin);
	freopen("run.out","w", stdout);
#endif
	int ryear[MAX];
	memset(ryear,0,sizeof(ryear));
	int x,y,n,sum = 0;
	bool kkk;
	cin>>x>>y;
	for(x,y; x <= y; x++) {

		kkk = pd(x);
		if(kkk) {
			sum++;
			ryear[n++] = x;
		}
	}
	cout<<sum<<endl;
	for(int step = 0; step < n; step++) {
		cout<<ryear[step]<<" ";
	}
	return 0;
}

大佬救救QWQ