C :

#include <stdio.h>
int main()
{
int n,i,j;

scanf("%d" , &n );
for( i=0;i<n ; i++ )
{
for( j=0;j<i; j++ )
printf("%5c" , ' ' );
for( j=1;j<=n-i; j++ )
printf("%5d" , j );
printf("\n");
}
return 0;
} 

C++ :

#include <iostream>
#include <iomanip>
using namespace std;

int main(){
	int a[10][10] = {0};
	int i,j,n;
	cin>>n;
	
	for (i = 0;i < n;i++){
		for (j = 0;j < n - i;j++){
			a[i][j + i] = j + 1;
		}
	}
	
	for (i = 0;i < n;i++){
		for (j = 0;j < n;j++){
			if (a[i][j] == 0){
				cout<<setw(5)<<" ";
			}else{
				cout<<setw(5)<<a[i][j];
			}
		}
		cout<<endl;
	}
}

Python :

def getList(m,n):
    '''
      m 行数
      n 列数
      返回的是m行n列的二维数组，默认值为0
    '''
    ma = [ [0 for i in range(n)] for i in range(m) ]
    return ma

def printList(arr):
    for i in arr:
        for j in i:
            if  j != 0:
               print('%5d' %(j) ,end='')
            else:
               print('%5s' %('') ,end='')
        print();

n = int( input() );
a = getList(n,n)
for i in range(0,n):
    k = 1
    for j in range(i,n):
        if j >= i:
          a[i][j] = k;
          k += 1

printList(a)