先说说我为什么写这些吧
- 当程序猿太苦逼了，真的，时间久了，真没有搬砖的成就感高，好歹人家能盖栋楼（身材也能练得不错），咱们指不定哪天来个熊孩子把硬盘格了就啥也没了。
- 这学期明显没把心放在前端上......汗啊，将来还想吃着口饭呢，但是这学期绝对没休息，只是忙了很多可能很多人认为无聊的事。
- 因为这学期无聊事太多了，耽误了很多，也让导师很失望，自己也很自卑，整理一下调调心态。
- 因为很多是针对作业的奇葩想法，所以，作业嘛，不糊弄就不是作业了，还希望大家多多批评。
- 兴许因为哪篇文章能解决工作呢。
- 我想试试Markdown。
靓照一张
进入正题
后台实现部分:
io = require "socket.io"
http = require "http"
fs = require "fs"
express = require "express"
mime = require "mime"
app = express()
server = http.createServer app
server.listen 8080
console.log "Listening 8080"
app.get "/",(req,res)->
path = "#{__dirname}/console.html"
res.writeHead 200,"Content-Type":mime.lookup(path)
res.end fs.readFileSync path
app.get "/jquery.min.js",(req,res)->
path = "#{__dirname}/jquery.min.js"
res.writeHead 200,"Content-Type":mime.lookup(path)
res.end fs.readFileSync path
app.get "/bootstrap.min.js",(req,res)->
path = "#{__dirname}/bootstrap.min.js"
res.writeHead 200,"Content-Type":mime.lookup(path)
res.end fs.readFileSync path
app.get "/bootstrap.min.css",(req,res)->
path = "#{__dirname}/bootstrap.min.css"
res.writeHead 200,"Content-Type":mime.lookup(path)
res.end fs.readFileSync path
getCurrentTime = ->
d = new Date()
return "#{d.getFullYear()}-#{d.getMonth()+1}-#{d.getDate()} #{d.getHours()}:#{d.getMinutes()}:#{d.getSeconds()}"
class dynamicPack
pack:(data)->
c=[]
i=0
j=0
while i<data.m+1
c[i]=[]
c[i][0]=0
i++
while j<data.n+1
c[0][j]=0
j++
i=1
while i<data.m+1
j=1
while j<data.n+1
if data.w[i-1]<=j
if c[i-1][j]<c[i-1][j-data.w[i-1]]+data.v[i-1]
c[i][j]=c[i-1][j-data.w[i-1]]+data.v[i-1]
else
c[i][j]=c[i-1][j]
else c[i][j] = c[i-1][j]
j++
i++
return c;
print:(c,data)->
x = []
i = data.m
n = data.n
str = ""
#console.log c[i][m]
while i>0
if c[i][n] > c[i-1][n]
x[i-1] = 1
n -= data.w[i-1]
else x[i-1] = 0
i--
i= 0
count = 0
while i<data.m
count += x[i]*data.v[i]
str += (i+1)+"," if x[i]!=0
i++
return str+"共计价值#{count}"
class knapPack
pack : (data)->
@v = data.v
@w = data.w
@m = data.m
@n = data.n
@cw = 0
@cv = 0
@put = []
@bestp = 0
temp_order = 0;
temp = 0
perp = []
i=0
while i<@m
perp[i] = @v[i]/@w[i]
@put[i] = 0;
i++
console.log perp
i=0
while i<@m
j=i+1
while j<@m
if perp[i]<perp[j]
temp = @v[i]
@v[i] = @v[j]
@v[j] = temp
temp = @w[i]
@w[i] = @w[j]
@w[j] = temp
j++
i++
backtrack : (i)->
console.log i
@bound i
if i>@m
@bestp = @cv
return
if @cw+@w[i]<=@n
@cw+=@w[i]
@cv+=@v[i]
@put[i]=1
@backtrack(i+1)
@cw-=@w[i]
@cv-=@v[i]
if @bound(i+1)>@bestp
@backtrack(i+1)
bound :(i)->
leftw = @n - @cw
b = @cv
while i<=@m and @w[i]<=leftw
leftw -= @w[i]
b += @v[i]
i++
b+=@v[i]/@w[i]*leftw if i<@m
return b
print :(data)->
@pack(data)
console.log @w
console.log @v
@backtrack(0)
console.log @put
return @bestp
dask = (msg)->
answer = ""
data = JSON.parse msg
console.log data
d = new dynamicPack()
console.log d.pack(data)
answer += "动态规划,选择物品"+d.print d.pack(data),data
return answer
kask = (msg)->
answer = ""
data = JSON.parse msg
console.log data
k = new knapPack()
answer += "分支限界,最优解"+k.print data
return answer
io.listen(server).on "connection",(socket)->
socket.on "msg",(msg)->
##console.log msg
socket.emit "msg",{time:getCurrentTime(),text:"calculating..."}
socket.emit "msg",{time:getCurrentTime(),text:dask(msg)}
socket.emit "msg",{time:getCurrentTime(),text:kask(msg)}
##socket.broadcast.emit "msg",data
console.log "#{getCurrentTime()}:Connected"
前端实现部分:
<html>
<head>
<meta charset="utf-8">
<script type="text/javascript" src="./jquery.min.js"></script>
<script type="text/javascript" src="./bootstrap.min.js"></script>
<script type="text/javascript" src="./socket.io/socket.io.js"></script>
<link rel="stylesheet" type="text/css" href="./bootstrap.min.css">
<script type="text/javascript">
$(function(){
var url = window.location.protocol + "//" + window.location.host;
var socket = io.connect(url);
socket.on('connect', function () {
$("#list").append('<li class="list-group-item">Connected</li>');
socket.on('msg',function(data){
$("#list").append($('<li class="list-group-item"></li>').text(data.time+">>"+data.text));
})
socket.on('disconnect',function(){
$("#list").append('<li class="list-group-item">Disconnected</li>');
})
})
$("#chat").keypress(function(e){
if (e.which == 13) {
e.preventDefault();
socket.emit('msg',$("#chat").val());
$("#list").append('<li class="list-group-item">'+$('#chat').val()+'</li>');
$('#chat').val(" ");
};
})
})
</script>
</head>
<body>
<br>
<div class="container well">
<ul class="list-group" id="list">
<li class="list-group-item">输入示例：{"n":10,"m":3,"w":[3,4,5],"v":[4,5,6]}其中n为背包容量，m为物品数量</li>
</ul>
<div>
<input type="text" class="form-control" id="chat">
</div>
</div>
</body>
</html>
