蒟蒻求助QAQ

#include<bits/stdc++.h>
using namespace std;
char pic[100][100];
int n,key;
void initi(){
	for(int i=1;i<=key;i++){
		for(int j=1;j<=key;j++){
			if(j%2!=0)pic[i][j]='-';
			else pic[i][j]='|';
		}
	}
	for(int i=1;i<=key;i++)pic[key/2+1][i]='-';
}
void print(){
	for(int i=1;i<=key;i++){
		for(int j=1;j<=key;j++){
			cout<<pic[i][j];
		}
		cout<<endl;
	}
}
void draw(int k,int x,int y){
	if(k%2==0)return;
	pic[x][y]='+';
	draw(k/2,x-k/2,y-k/2);
	draw(k/2,x+k/2,y-k/2);
	draw(k/2,x-k/2,y+k/2);
	draw(k/2,x+k/2,y+k/2);
}
int main(){
    cin>>n;
    key=pow(2,n)-1;
    initi();
	draw(key,key/2+1,key/2+1);
	print();
	return 0;
}