&的意思是在后台运行，什么意思呢？ 意思是说，当你在执行./a.out&的时候，即使你用ctrlC, 那么a.out照样运行（因为对SIGINT信号免疫）。但是要注意，如果你直接关掉shell后，那么，a.out进程同样消失。可见，&的后台并不硬（因为对S...
#!/bin/bashexportTOP_PID=$$trap'exit1'TERMexit_script(){kill-sTERM$TOP_PID}echo"beforeexit":|exit_scriptecho"afterexit"EOF 执行结果为beforeexit...
classHashTable:def__init__(self,size):self.elem=[Noneforiinrange(size)]self.count=size#defhash(self,key):returnkey%self.count#definsert_hash(self,key)...
classBSTNode:def__init__(self,data,left=None,right=None):self.data=dataself.left=leftself.right=rightclassBinarySortTree:def__init__(self):self._root=...
deffibonacci_search(lis,key):#F=[1,1,2,3,5,8,13,21,34,55,89,144,233,377,610,987,1597,2584,4181,6765,10946,17711,28657,46368]low=0high=len(lis)-1#k=0wh...
defbinary_search(lis,key):low=0high=len(lis)-1time=0whilelow<high:time+=1mid=int((low+high)/2)ifkey<lis[mid]:high=mid-1elifkey>lis[mid]:low=m...
defbinary_search(lis,key):low=0high=len(lis)-1time=0whilelow<high:time+=1#mid=low+int((high-low)*(key-lis[low])/(lis[high]-lis[low]))print("mid=%s,...
defsequential_search(lis,key):foriinrange(len(lis)):if(lis[i]==key):returnielse:returnFalseLIST=[1,5,8,123,22,54,7,99,300,222]result=sequential_search...
defmerge_sort(array):defmerge_arr(arr_l,arr_r):array=[]whilelen(arr_l)andlen(arr_r):ifarr_l[0]<=arr_r[0]:array.append(arr_l.pop(0))elifarr_l[0]>...
importcopydefheap_sort(hlist):defheap_adjust(parent):child=2*parent+1#leftchildwhilechild<len(heap):ifchild+1<len(heap):ifheap[child+1]>heap[...
defradix_sort(array):bucket,digit=[[]],0whilelen(bucket[0])!=len(array):bucket=[[],[],[],[],[],[],[],[],[],[]]foriinrange(len(array)):num=(array[i]//1...
defquick_sort(qlist):ifqlist==[]:return[]else:qfirst=qlist[0]qless=quick_sort([lforlinqlist[1:]ifl<qfirst])qmore=quick_sort([mforminqlist[1:]ifm>...
defselect_sort(slist):foriinrange(len(slist)):x=iforjinrange(i,len(slist)):ifslist[j]<slist[x]:x=jslist[i],slist[x]=slist[x],slist[i]returnslistsli...
defbubble_sort(blist):count=len(blist)foriinrange(0,count):forjinrange(i+1,count):ifblist[i]>blist[j]:blist[i],blist[j]=blist[j],blist[i]returnblis...
definsert_sort(ilist):foriinrange(len(ilist)):forjinrange(i):ifilist[i]<ilist[j]:ilist.insert(j,ilist.pop(i))breakreturnilistilist=insert_sort([4,5...
版权申明：本文为博主窗户(Colin Cai)原创，欢迎转帖。如要转贴，必须注明原文网址 http://www.cnblogs.com/Colin-Cai/p/7899171.html 作者：窗户 QQ：6679072 E-mail：6679072@qq.com bp神经网络为大家所熟知，推导中使用了基于梯度下降。而对于更为一般的情况，解决问题的出发点是建立一组函数fi(Ci,Xi), i=1..n，n为输出的个数，也就是函数的个数，对于每个fi，Ci是一个参数向量，Xi是一个输入向量，我们的目标就是为这组函数中的每个fi找到最合适的Ci。 ...
