EaSy!!!

代码如下

#include<bits/stdc++.h>
using namespace std;
char c1,c2;
int n,m;
int main(){
	cin>>n>>m;
	n=n*2+1;m=m*2+1;
	for(int i=1;i<=n;i++){
		if(i%2==1){
			c1='+';
            c2='-';
		}else{
            c1='|';
            c2=' ';
        }
		for(int j=1;j<=m;j++){
			if(j%2==1)cout<<c1;
			else cout<<c2;
		}
		cout<<endl;
	}
}