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]=i+1;
		for(j=1;j<n-i;j++){
			a[i][j]=a[i][j-1]+1;
		}
		for(j=n-i;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 < n)
                    {
                        a[i][j] = i + j + 1;
                    }
                    else
                    {   
                        a[i][j] = 2*n-(i+j)-1;
                    }

                }
            }

            for (int i = 0; i < n; i++)
            {
            
                for (int j = 0; j < n; j++)
                {
                     cout<<setw(3)<<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:
            print('%3d' %(j),end='')
        print();

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