《4分代码》

#include <iostream>
#include <iomanip>
#include <algorithm>
#include <cmath>
#include <string>
#include <cstring>
using namespace std;
int n;
int main(){
	cin>>n;
	for(int i=1;i<=n;i++){
		if(i%2!=0){
			for(int j=1;j<=n;j++){
				if(j==1||j==n){
					cout<<"|";
				}else{
					cout<<"-";
				}
			}
		}else{
			for(int j=1;j<=n;j++){
				if(j==1||j==n){
					cout<<"|";
				}else{
					cout<<"x";
				}
			}
		}
		cout<<endl;
	}
	return 0;
}