C :

#include<stdio.h> 


int main(){ 
	int n,i,j,z;
	scanf("%d",&n);
	//控制输出的行数 
	for(i = n;i >= 1;i--){
		//控制每行输出空格量 
		for(j = 0;j < n-i;j++){
			printf(" "); 
		}
		//控住输出的*
		for(z=1;z <= 2 * i - 1;z++){
			printf("*");
		} 
		//负责换行 
		printf("\n");
	}

} 

C++ :

#include <iostream>
using namespace std;
int main (){
	int i,j,n;
	cin>>n;
	char c;
	for(i=n;i>=1;i--){
		for(j=1;j<=n-i;j++){
			cout<<" ";
		}
		
		for(j=1;j<=i+i-1;j++){
			
			cout<<"*";
		}
		cout<<endl;
	}
}

Python :

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