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++){
			if(j==n-i){
				a[i][j]=1;
			}else{
				a[i][j]=a[i][j-1]+1;
			}
		}
	}
	for(i=0;i<n;i++){
		for(j=0;j<n;j++){
			printf("%3c",(a[i][j]+'A'-1));
		}
		printf("\n");
	} 
return 0;
} 

C++ :

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

int main(){
	int a[10][10];
	int i,j,n;
	cin>>n;
	
	for (i = 0;i < n;i++){
		for (j = 0;j < n;j++){
			if (i + j + 1 <= n){
				a[i][j] = i + j + 1 + 64;
			}else{
				a[i][j] = i + j + 1 - n + 64;
			}
		}
	}
	
	for (i = 0;i < n;i++){
		for (j = 0;j < n;j++){
			cout<<setw(3)<<char(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('%3s' %(chr(j + 64)) ,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
        k += 1
        if i + j == n - 1:
          k = 0
        
printList(arr)
'''
1 2 3 4 5
2 3 4 5 1
3 4 5 1 2

'''