过了样例，说明没什么大问题，但 WA。求大佬调试，谢谢！

//程序算法：位运算
//C++14(GCC 9) O2
#include <bits/stdc++.h>
#define int long long
using namespace std;
const int N=110;

string disk[N][N];
int d,s,b;
char op;

void print_disk()
{
	for(int i=1;i<=b;i++)
	{
		for(int j=1;j<=d;j++)
			cout<<disk[i][j]<<' ';
		cout<<endl;
	}
}

void print_0x(string s)
{
	int x=0;
	for(int i=0;i<s.size();i++)
		x=x*2+s[i]-'0';
	if(x==0)
	{
		cout<<"0"<<endl;
		return;
	}
	//cout<<x<<endl;
	
	string ans="";
	while(x)
	{
		int r=x%16;
		//cout<<r<<endl;
		
		char c;
		if(r<10)c=r+'0';
		else c='A'+r-10;
		
		ans=c+ans;
		x/=16;
	}
	
	cout<<ans<<endl;
}

bool is_valid(string& ans)
{
	for(int i=1;i<=b;i++)                 //判断第b个数据块是否合法
	{
		for(int j=1;j<=s;j++)            //使用时下标需减1
		{
			int cnt=0,tmp=0,pos=-1;
			for(int k=1;k<=d;k++)
			{
				char c=disk[i][k][j-1];
				//cout<<disk[i][k]<<' '<<c<<endl;
				if(c=='x')
				{
					if(cnt>=2)return false;
					else pos=k;
				}
				else tmp^=(c-'0');
			}
			//cout<<pos<<endl;
			if(pos!=-1)
			{
				int num;
				if(op=='E')num=tmp^0;
				else num=tmp^1;
				disk[i][pos][j-1]=num+'0';
			}
			else
			{
				if(op=='E'&&tmp==1)return false;
				if(op=='O'&&tmp==0)return false;
			}
		}
	}
	
	//print_disk();
	
	string str="";
	for(int i=1;i<=b;i++)
		for(int j=1;j<=d;j++)
		{
			if((i%d==0&&j==d)||i%d==j)continue;
			str+=disk[i][j];
		}
	
	for(int i=1;i<=str.size()%4;i++)
		str+='0';
	ans=str;
	//cout<<ans<<endl;
	return true;
}

void fast_read()
{
	ios::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
}

signed main()
{
	//freopen("input.in","r",stdin);
	//freopen("output.out","w",stdout);
	
	for(int kase=1;cin>>d&&d;kase++)
	{
		cin>>s>>b>>op;
		
		//输入disk
		for(int i=1;i<=d*b;i++)
		{
			string str;
			char ch;
			for(int j=1;j<=s;j++)cin>>ch,str+=ch;
			
			//cout<<d<<' '<<s<<' '<<b<<endl;
			if(i%b==0)disk[b][i/b]=str;
			else disk[i%b][i/b+1]=str;
		}
		
//		print_disk();
//		cout<<"---------------------------------------------"<<endl;
		string ans="";
		
		if(is_valid(ans))
			printf("Disk set %lld is valid, contents are: ",kase),print_0x(ans);
		else printf("Disk set %lld is invalid.",kase),cout<<endl;
	}
	return 0;
}