section .data
vuid db 'BC220412669' ; VUID string
numeric_digits db 0, 0, 0, 0, 0, 0, 0, 0, 0 ; array to store numeric digits
subtracted_digits db 0, 0, 0, 0, 0, 0, 0, 0, 0 ; array to store subtracted digits
largest_digit db 0 ; variable to store the largest digit
section .text
global _start
_start:
; Step 1: Load the VUID into a register or memory
mov esi, vuid ; point to the start of the VUID string
; Step 2: Parse the numeric part of the VUID and store it in the numeric_digits array
mov ecx, 9 ; loop counter for 9 numeric digits
mov ebx, numeric_digits ; point to the start of numeric_digits array
parse_loop:
mov al, [esi+2] ; get the first numeric digit from VUID
sub al, '0' ; convert ASCII to numeric value
mov [ebx], al ; store the numeric digit in numeric_digits array
inc ebx ; move to the next element in the array
inc esi ; move to the next character in VUID
loop parse_loop ; repeat for all numeric digits
; Step 3: Find the largest numeric digit of the VUID and store it in largest_digit
mov ecx, 9 ; loop counter for 9 numeric digits
mov al, [numeric_digits] ; initialize largest_digit with the first digit
mov [largest_digit], al
find_largest_digit:
inc ebx ; move to the next digit
mov al, [ebx] ; get the next digit
cmp al, 0 ; check if it's the end of the array
je done_finding_largest_digit
cmp al, [largest_digit] ; compare with the largest digit found so far
jle not_largest ; if not larger, skip
mov [largest_digit], al ; update largest_digit
not_largest:
loop find_largest_digit ; repeat for all digits
done_finding_largest_digit:
; Step 4: Subtract each numeric digit from the largest digit and store the results
; in the subtracted_digits array
mov ecx, 9 ; loop counter for 9 numeric digits
mov ebx, numeric_digits ; point to the start of numeric_digits array
mov edx, subtracted_digits ; point to the start of subtracted_digits array
subtract_loop:
mov al, [ebx] ; get the numeric digit
sub al, [largest_digit] ; subtract the largest digit
mov [edx], al ; store the result in subtracted_digits array
inc ebx ; move to the next digit in numeric_digits
inc edx ; move to the next element in subtracted_digits
loop subtract_loop ; repeat for all digits
; Step 5: Sort the subtracted_digits array in ascending order
; You can use any sorting algorithm here, like bubble sort or insertion sort
; Output the sorted array or store it in memory, depending on requirements
; Exit the program
mov eax, 1 ; exit syscall number
xor ebx, ebx ; exit code 0
int 0x80 ; call kernel
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