• + 75 comments

    Python3 answer

    sum = []
    
    
    for i in range(len(arr)-2):
        for j in range(len(arr)-2):
            sum.append(arr[i][j]+arr[i][j+1]+arr[i][j+2]+arr[i+1][j+1]+arr[i+2][j]+arr[i+2][j+1]+arr[i+2][j+2])
            
    print(max(sum))