能帮忙看一下哪里错了吗

#include<iostream>
using namespace std;
int n,s,x,t,a[100005];
signed main(){
	cin>>t;
	while(t--){
		cin>>n;
		for(int i=1;i<=n;i++){
			cin>>a[i];
			if(a[i]==1)s++;
		}
		cout<<s<<endl;
		for(int i=1;i<=n;i++){
			if(a[i]==1)x+=1;
			else if(x!=s)a[i]=1;
			cout<<a[i]<<' ';
		}
		cout<<endl;
	}
	return 0;
}