阿尔法编程python答案第四章_浙江大学版《Python编程》第四章解答,浙大,程序设计,题目,集,答案...

'''T4-1

n = int(input())

for i in range(n+1):

print("pow(3,%d) = %d"%(i,pow(3,i)))

'''

'''T4-2

n,m = input().split()

n = int(n)

m = int(m)

cnt = 0

sum = 0

if n<=2 :

n=2

while n<=m:

tmp = n

lo = 2

flag=1

while lo*lo<=tmp:

if tmp%lo==0:

flag=0

break

lo+=1

if flag==1:

sum+=tmp

cnt+=1

n+=1

print(cnt,sum)

'''

'''T4-3

n = int(input())

sum=1

n-=1

while n :

n-=1

sum = (sum+1)*2

print(sum)

'''

'''T4-4

import math

def is_p(n):

if n<=1:

return False

else:

for i in range(2,int(math.sqrt(n)+1)):

if n%i==0:

return False

return True

x = int(input())

for i in range(2,x//2+1):

if is_p(i)==True and is_p(x-i)==True:

print(x,"= %d + %d"%(i,x-i))

break

'''

'''T4-5

a = 1

sum = 1

n=int(input())

for i in range(1, n+1):

a*= i;

item=1 / a;

sum += item;

print("{:.8f}".format(sum))

'''

'''T4-6

def fib(n):

a,b = 0,1

for i in range(n+1):

a,b=b,a+b

return a

n = int(input())

if n >0:

for i in range(n):

print('{:11d}'.format(fib(i)),end="");

if((i+1)%5==0):

print()

else:

print("Invalid.")

'''

'''T4-7

n = int(input())

if(n==0):

print('average = 0.0')

print('count = 0')

exit(0)

lis = list(map(int,input().split()))

sum=0

cot=0

for i in range(len(lis)):

sum+=lis[i]

if lis[i]>=60:

cot+=1

avg = sum*1.0/(len(lis))

print("average = {:.1f}".format(avg))

print("count = {:d}".format(cot))

'''

'''4-8

fenzi = 2

fenmu = 1

sum=0

n = int(input())

if n==0:

print("{:.2f}".format(0))

exit(0)

if n==1:

print("{:.2f}".format(2))

exit(0)

sum=2

for i in range(n-1):

fenmu,fenzi = fenzi,fenzi+fenmu

sum+=fenzi*1.0/fenmu

print("{:.2f}".format(sum))

'''

'''4-9

print('[1] apple')

print('[2] pear')

print('[3] orange')

print('[4] grape')

print('[0] exit')

lst = list(map(int,input().split()))

for i in range(0, 5):

c = int(lst[i])

if (c == 1):

print('price = 3.00')

elif (c == 2):

print('price = 2.50')

elif (c == 3):

print('price = 4.10')

elif (c == 4):

print('price = 10.20')

elif (c == 0):

break

else:

print('price = 0.00')

'''

'''4-10

def gcd(a,b):

return a if b==0 else gcd(b,a%b)

a,b = map(int,input().split())

p = gcd(a,b)

b = b*a/p

print("%d %d"%(p,b))

'''

'''4-11

n = int(input())

for i in range(n):

x = int(input())

flag=1

for i in range(2,x):

if x%i==0:

flag=0

break

if flag==1:

print("Yes")

else:

print("No")

'''

'''4-12

a,b=0,1

n = int(input())

while(True):

if a>n:

print(a)

break

a,b = b,a+b

'''

'''4-13

import math

e = float(input())

a=1

i=2

t=2

b=1/t

sum=2

while(a-b>=e):

a=b

sum=sum+a

i=i+1

t=t*i

b=1/t

print('{:.6f}'.format(sum))

'''

'''4-14

count=letter=digit=other=blank=0

text = input()

while True:

for i in text:

count+=1

if i<='9' and i>='0':

digit+=1

elif i<='z' and i>='a' or i>='A' and i<='Z':

letter+=1

elif i==' ' or i=='n':

blank+=1

else:

other+=1

if count==10:

break;

text = input()

blank+=1

count+=1

print('letter = {:d}, blank = {:d}, digit = {:d}, other = {:d}'.format(letter,blank,digit,other))

'''

'''4-15 写法1

target = int(input())

count=0

lis_fen5=list()

lis_fen3=list()

lis_fen1=list()

for fen5 in range(1,20):

for fen2 in range(1,50):

for fen1 in range(1,100):

if fen5*5+fen2*2+fen1*1==target:

count+=1

lis_fen5.append(fen5)

lis_fen3.append(fen2)

lis_fen1.append(fen1)

#print('fen5:{:d}, fen2:{:d}, fen1:{:d}, total:{:d}'.format(fen5,fen2,fen1,fen5+fen2+fen1))

len_lis = len(lis_fen5)

len_lis-=1

while len_lis>=0:

fen5=lis_fen5[len_lis]

fen2=lis_fen3[len_lis]

fen1=lis_fen1[len_lis]

len_lis-=1

print('fen5:{:d}, fen2:{:d}, fen1:{:d}, total:{:d}'.format(fen5,fen2,fen1,fen5+fen2+fen1))

print('count = {:d}'.format(count))

'''

'''4-16

arr = list(map(int,input().split()))

arr.sort()

a=arr[0]

b=arr[1]

c=arr[2]

if a+b>c :

print('yes')

else :

print('no')

'''

'''4-17

bits = int(input())

qi=1

zhong=10

for i in range(bits-1):

qi*=10

zhong*=10

while qi

tmp=qi

sum=0

while tmp!=0:

p=tmp%10

tmp/=10

tmp=int(tmp)

tmp_num=1

for i in range(bits):

tmp_num=tmp_num*p

sum+=tmp_num

if sum == qi:

print(qi)

qi+=1

'''

'''4-18

n=int(input())

import numpy as np

vis =np.zeros([n+1,1])

count=0

num=0

flag=0

while True:

if flag==1:

break

for i in range(1,n+1):

if vis[i]==1:

continue

count+=1

if count ==3:

num+=1

if num==n:

print(i)

flag=1

break;

else:

count=0

vis[i]=1

'''

'''4-19

import numpy as np

n = int(input())

arr = np.zeros([n,n],dtype=int);

for i in range(n):

lis = list(map(int,input().split()))

for j in range(n):

arr[i][j]=lis[j]

sum=0

for i in range(n-1):

for j in range(n-1):

if i+j!=n-1:

sum+=arr[i][j]

print(sum)

'''

'''4-20

import numpy as np

a,b=map(int,input().split())

arr = np.zeros([a,b],dtype=int)

for i in range(a):

lis =list(map(int,input().split()))

sum=0

for j in range(b):

sum+=lis[j]

print(sum)

'''

'''4-21

import numpy as np

n = int(input())

for i in range(n):

m = int(input())

arr = np.zeros([m,m])

for j1 in range(m):

lis = list(map(int,input().split()))

for j in range(m):

arr[j1][j]=lis[j]

flag=1

for j1 in range(m):

for j in range(m):

if j1>j:

if arr[j1][j]!=0:

flag=0

if flag==1:

print('YES')

else:

print('NO')

'''

'''4-22

import numpy as np

n = int(input())

arr = np.zeros([n,n])

for i in range(n):

lis = list(map(int,input().split()))

for j in range(n):

arr[i][j]=lis[j]

flag=0

for i in range(n):

if flag==1:

break;

for j in range(n):

maxn=minn=arr[i][j]

for z in range(n):

maxn = max(maxn,arr[i][z])

minn = min(minn,arr[z][j])

if maxn==arr[i][j] and minn == arr[i][j]:

flag=1

print(i,j)

break;

if flag==0:

print('NONE')

'''

'''4-23

import numpy as np

n,m = map(int,input().split())

arr = np.zeros([n,m],dtype=int)

for i in range(n):

lis = list(map(int,input().split()))

for j in range(m):

arr[i][j]=lis[j]

cnt=0

for i in range(1,n-1):

for j in range(1,m-1):

if arr[i-1][j]

print(arr[i][j],i+1,j+1)

cnt+=1

if cnt==0:

print('None',n,m)

'''

'''4-24

line = int(input())

for i in range(1,line+1):

for j in range(1,i+1):

if j==1:

print("{:d}*{:d}={:<4d}".format(j,i,i*j),end="")

else:

print("{:d}*{:d}={:<4d}".format(j,i,i*j),end="")

print()

'''

'''4-25

qi="A"

line = int(input())

for i in range(line):

for j in range(line-i):

print("%c "%qi,end="")

qi=chr(ord(qi)+1)

print()

'''

'''4-26

line = int(input())

sum=0

qi=1

for i in range(1,line+1):

qi*=i;

if i%2==1:

sum+=qi

print("n={:d},s={:d}".format(line,sum))

'''

'''4-27

import numpy as np

cun = np.zeros([3,3],dtype=int)

arr = list(map(int,input().split()))

i=0

for x in range(3):

for y in range(3):

cun[x][y]=arr[i]

i+=1

for x in range(3):

sum=0

maxn=cun[x][0]

for y in range(3):

sum+=cun[x][y]

maxn=max(maxn,cun[x][y])

print("{:>4d}".format(cun[x][y]),end="")

print("{:>4d}{:>4d}".format(maxn,sum))

'''

'''4-28

import numpy as np

cun = np.zeros([3,3],dtype=int)

arr = list(map(int,input().split()))

i=0

for x in range(3):

for y in range(3):

cun[x][y]=arr[i]

i+=1

for x in range(3):

for y in range(3):

print("{:>4d}".format(cun[y][x]),end="")

print()

'''

'''4-29

lis_a = list(map(int,input().split()))

lis_b = list(map(int,input().split()))

len_a = lis_a[0]

len_b = lis_b[0]

lis_ans = []

for i in range(1,len_a+1):

flag=1

for j in range(1,len_b+1):

if lis_a[i]==lis_b[j]:

flag=0

if flag==1:

for z in range(len(lis_ans)):

if lis_ans[z]==lis_a[i]:

flag=0

if flag==1:

lis_ans.append(lis_a[i])

for i in range(1,len_b+1):

flag=1

for j in range(1,len_a+1):

if lis_b[i]==lis_a[j]:

flag=0

if flag==1:

for z in range(len(lis_ans)):

if lis_ans[z]==lis_b[i]:

flag=0

if flag==1:

lis_ans.append(lis_b[i])

for i in range(len(lis_ans)):

if i==0:

print(lis_ans[i],end="")

else:

print("",lis_ans[i],end="")

'''

'''4-30

a,b = map(int,input().split())

cnt=0

for i in range(a,b+1):

ans = [1]

sum=1

if i!=2 and i!=6 and i!=28 and i!=496 and i!=8128:#打表试出来的，结果就这几个

continue

for z in range(2,i):

if i%z==0:

sum+=z

ans.append(z)

if sum>i:

break

if sum==i:

cnt+=1

print("{:d} =".format(i),end="")

for zx in range(len(ans)):

if zx != len(ans)-1:

print(" {:d} +".format(ans[zx]),end="")

else:

print(" {:d}".format(ans[zx]))

if cnt==0:

print("None")

'''