#include <stdio.h>
#include <string.h>
#include <queue>
#include <math.h>
#include <vector>
#include <algorithm>
#include <iomanip>
#include <stack>
#include<cstring>
#include <bits/stdc++.h>
using namespace std;
int n, m;
char ch;
bool a;
int main(){
	cin>>n>>m>>ch>>a;
	for (int i=1 ; i<=n; i++)
	{
		for (int j=1 ; j<=m; j++)
		{
		    if(i == 1 || i == n || j == 1 || j == m)
			{
				cout << ch;
				
				
			}
			else{
				if (a==1){
					cout << ch;
				}
				else{
					cout << " ";
				}
			}
		}
		cout << endl;
	}
} 

#include<bits/stdc++.h>
using namespace std;
int n,m,flag;
char ch;
void paint(int n,int m,char ch,bool flag)
{
	for(int i=1;i<=n;i++)
	{
		if(flag)
		{
			for(int j=1;j<=m;j++)cout<<ch;
			cout<<endl;
		}
		else if(i!=1&&i!=n)
		{
			cout<<ch;
			for(int j=2;j<m;j++)cout<<" ";
			cout<<ch<<endl;
		}
		else
		{
			for(int j=1;j<=m;j++)cout<<ch;
			cout<<endl;
		}
	}
}
int main()
{
	cin>>n>>m>>ch>>flag;
	paint(n,m,ch,flag);
	return 0;
}

纯手工题解，无抄袭

#include <iostream> 
using namespace std;
int n,m,d;
char a;
int main()
{
	cin>>n>>m>>a>>d;
	if(d==1)
	{
		for(int i=1;i<=n;i++)
		{
			for(int j=1;j<=m;j++)
			{
				cout<<a; 
			}
			cout<<endl;
		}
	}
	if(d==0)
	{
		for(int i=1;i<=n;i++)
		{
			if(i==1 || i==n)
			{
					for(int j=1;j<=m;j++)
			cout<<a;
			}
			else
			{
				for(int j=1;j<=m;j++)
				{
					if(j==m || j==1)
				cout<<a;
				else
				cout<<" ";
				}
				
			}
			cout<<endl;
		}

	}
	return 0;
}

#include <iostream> #include <iomanip> #include <cmath> using namespace std; int main() { int r,c; char s; bool b; cin >> r >> c >> s >> b; for(int i=1;i<=r;i++) { for(int j=1;j<=c;j++) {

		if(i == 1 || i == r || j == 1 || j == c)
		{
			cout << s;
		}else{
			if(b == 1)cout << s;
			else cout << " ";
		}
	}
	cout << endl;
}
return 0;

}