已AC，放心食用

#include<bits/stdc++.h>
using namespace std;
int main(){
	int n;
	cin >> n;
	for(int i = 1 ; i <= n ; i++){
		for(int h = 1 ; h < n-i+1 ; h++)cout << ' ' ;
		if(i == 1 || i == n)for(int l = 1 ; l <= i*2-1 ; l++)cout << '*' ;
        else{
			cout << '*' ;
			for(int j = 1 ; j < i*2-2 ; j++)cout << ' ' ;
			cout << '*' ;
		}
		cout << endl ;
	} 
	return 0;
}

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