用汇编语言写djkstra
时间: 2024-05-09 11:01:29 浏览: 10
好的,以下是用汇编语言写的Dijkstra算法示例:
```
; Dijkstra's Algorithm in x86 Assembly Language
; Author: [Your Name Here]
; Date: [Date]
; Define the constants
n equ 6
inf equ 9999h
; Define the graph
graph db 0, 7, 9, inf, inf, 14,
7, 0, 10, 15, inf, inf,
9, 10, 0, 11, inf, 2,
inf, 15, 11, 0, 6, inf,
inf, inf, inf, 6, 0, 9,
14, inf, 2, inf, 9, 0
; Define the distance array
dist db inf, inf, inf, inf, inf, inf
; Define the visited array
visited db 0, 0, 0, 0, 0, 0
section .data
global main
extern printf
section .text
; Define the main function
main:
; Set up the stack frame
push ebp
mov ebp, esp
; Initialize the distance array
mov esi, dist
mov ecx, n
mov al, inf
rep stosb
; Initialize the visited array
mov esi, visited
mov ecx, n
xor al, al
rep stosb
; Set the distance to the starting vertex to 0
mov byte [dist], 0
; Set up the loop counter
mov ecx, n
loop:
; Find the vertex with minimum distance
mov esi, dist
mov edi, visited
mov ebx, inf
mov edx, -1
mov ecx, n
cld
repne scasb
jz done
mov ecx, n
dec ecx
mov esi, dist
mov edi, visited
cld
findmin:
lodsb
cmp ebx, al
jle skip
cmp byte [edi+ecx], 0
jne skip
mov ebx, al
mov edx, ecx
skip:
loop findmin
mov byte [visited+edx], 1
; Update the distances of the neighboring vertices
mov esi, graph
mov ecx, n
mov edi, dist
mov ebx, edx
add ebx, ebx
add esi, ebx
findnbr:
cmp byte [esi], inf
je next
cmp byte [visited+ecx-1], 1
jne next
mov al, [esi]
add al, [dist+edx]
cmp al, [dist+ecx-1]
jge next
mov byte [dist+ecx-1], al
next:
inc ecx
add esi, n
cmp ecx, n
jl findnbr
; Decrement the loop counter
dec ecx
jnz loop
done:
; Print the distances
mov esi, dist
mov ecx, n
printloop:
push ecx
push esi
push format
call printf
add esp, 8
inc esi
pop ecx
loop printloop
; Clean up the stack and exit
mov esp, ebp
pop ebp
xor eax, eax
ret
section .data
format db "%d ", 0
```
注意,这个代码只是一个示例,可能需要根据具体情况进行调整。同时,这个代码只是用汇编语言实现Dijkstra算法的一种方式,实现方式有很多种,具体实现方法可以根据需要进行调整。