Class LinkNode:
Def __init__(self,data_,next_=None):
self.data=data_
self.next=next_
链表结构如图所示,已知原链表各节点值分别为“上->山->打->老->虎”。
已知pre,p和r分别指向3个连续的节点,现在想要调整链表中某些节点的顺序,编写了如下的Python代码段:
pre.next=r
p.next=r.next
r.next=p
则程序执行后,该链表的结构可以表示为( )
Windows98/XP文件系统目录的组织形式属于( )
# 输入n个数从小到大依次存储到列表nums中,代码略
k = -1
for i in range(n):
if nums[i] < 0:
k = i
else:
break
ans = []
i, j = k, k + 1
while i >= 0 or j < n:
if i < 0:
ans.append()
j += 1
elif j==n:
ans.append(nums[i] * nums[i])
elif :
i -= 1
ans.append(nums[j] * nums[j])
print(ans)
def isprime(n): #判断n是不是素数
for i in range():
if n%i==0:
return True
def strsum(word): #统计单词的字母值总和
dic={"a":1,"b":2,"c":3,"d":4,"e":5,"f":6,"g":7,"h":8,"i":9,"j":10,
"k":11,"l":12,"m":13,"n":14,"o":15,"p":16,"q":17,"r":18,"s":19,
"t":20,"u":21,"v":22,"w":23,"x":24,"y":25,"z":26}
n=0
for ch in word:
return n
word=input("请输入一个单词:")
s=strsum(word)
if flag:
print("这是一个素单词")
print("这不是一个素单词")
比如:仓库存储情况列表 a=["0", "A", "A", "B", "B", "A", "0", "0", "0"],其中"0"表示空位,"A", "B"表示位置上货物种类 , 现需从中取出一件B货物,则应从右侧取出,取完后,仓库存储列表更新为a=["0", "A", "A", "B", "A", "0", "0", "0", "0"]。
#读取仓库存储情况列表a,最多存储件数 m,代码略
kind=input("请输入货物:")
left=right=0 #left记录从左侧取出此货物时需移动其他物品的次数,right记录从右侧取出此货物时需移动其他物品的次数
i=0;j=m-1
t=[0, 0] #t表示是否找到此货物
while i<-j and t! =[1, 1]:
if :
i=i+1
elif a[i]! =kind:
left+=1
else:
t[0]=1
if a[j] = =”0”:
j=j -1
elif a[j]! =kind:
t[1]=1
if left>right:
for k in range(j , m-1):
a[k]=a[k+1]
a[m-1] ="0"
for k in range(i , 0, -1):
a[0] ="0"
print(a)