C :

#include<stdio.h>
int main()
{
	int n,i,j;
	scanf("%d",&n);
	int a[n][n];
	for(i=0;i<n;i++){
		a[i][0]=n-i;
		for(j=1;j<=i;j++){
			a[i][j]=a[i][j-1];
		}
		for(j=i+1;j<n;j++){
			a[i][j]=a[i][j-1]-1;
		}
	}
	for(i=0;i<n;i++){
		for(j=0;j<n;j++){
			printf("%3d",a[i][j]) ;
		}
		printf("\n");
	}
return 0;
}

C++ :

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

int main(){
 	    int n;
            int a[11][11];
	    cin>>n;
			
            for (int i = 0; i < n; i++)
            {
                for (int j = 0; j < n; j++)
                {
                   
                    if (i >=j)
                    {
                        a[i][j] =n-i;
                    }
                    else
                    { 
                        a[i][j] = n-j;
                    }
                }
            }

            for (int i = 0; i < n; i++)
            {
             
                for (int j = 0; j < n; j++)
                {
                     cout<<setw(3)<<a[i][j];
                }
               cout<<endl;
            }


}

Python :

n = int(input())
a = [[0 for j in range(n)] for i in range(n)]

for i in range(n):
    # 先定好第一列数字
    a[i][0] = n - i
    for j in range(1, i + 1):
        a[i][j] = a[i][j - 1]
    for j in range(i + 1, n):
        a[i][j] = a[i][j - 1] - 1

for i in range(n):
    for j in range(n):
        print('%3d' % a[i][j], end='')
    print()