for (int i = 1; i <= 2 * n - 1; i++)
	{
		for (int j = 1; j <= 2 * n - 1; j++)
		{
			if (j<i + n && j>n - i && j<3 * n - i && j>i - n)
				cout << "*";
			else
				cout << " ";
		}
		cout << endl;
	}


```cpp
#include<iostream>
using namespace std;
int main(){
	int n;
	cin>>n;
	for(int i=1;i<=n;i++){
		for(int k=1;k<=n-i;k++){
			cout<<" ";
		} 
		for(int j=1;j<=2*i-1;j++){
			if(j==1 or j==2*i-1){
				cout<<'*';
			}else{
				cout<<" ";
			}
			
		}
		cout<<endl;
	}
	
	for(int i=n-1;i>=1;i--){
		for(int k=1;k<=n-i;k++){
			cout<<" ";
		} 
		for(int j=1;j<=2*i-1;j++){
			if(j==1 or j==2*i-1){
				cout<<'*';
			}else{
				cout<<" ";
			}
		}
		cout<<endl;
	}
	
	
	return 0;
}
```


题解

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