C :

#include<stdio.h>
void main()
{
	int n,i,j;
	scanf("%d",&n);
	//控制输出n行 
	for(i=1;i<=n;i++)
	{
		//输出第i行空格的数量 
		for(j=1;j<=n-i;j++)
			printf(" ");
		
		//输出第i行*的数量
		 for(j=1;j<=2*i-1;j++)
			 printf("*");
			 
		 printf("\n");
		 
	}


	
	


	
	
		
}

C++ :

#include <iostream>
using namespace std;

int main(){ 
	int i,j,n;
	char c='A';
	cin>>n;
	for(i = 1;i <= n;i++){	
		for(j = 1;j <= n - i;j++){
			cout<<" ";
		} 		
		for(j = 1;j <= 2 * i - 1;j++){
			cout<<"*";
		} 	
		cout<<endl;
	} 	 
}

Python :

n= int(input())
for i in range (1, n + 1):
    for k in range (1, n - i + 1):
        print(' ', end='')
    for j in range (1, 2 * i):
        print('*', end = '')
    print();