昨天和大家分享了81-90题，今天继续来刷最后的91-100题
Question 91:
Please write a program which accepts a string from console and print it in reverse order.**Example:
If the following string is given as input to the program:*
rise to vote sirThen, the output of the program should be:
ris etov ot esir解法一
s = input()
s = ''.join(reversed(s))
print(s)解法二
s=input()
s = s[::-1]
print(s)Question 92:
Please write a program which accepts a string from console and print the characters that have even indexes.*Example:
If the following string is given as input to the program:*
H1e2l3l4o5w6o7r8l9dThen, the output of the program should be:
Helloworld解法一
s=input()
print(s[::2])解法二
s = "H1e2l3l4o5w6o7r8l9d"
s = [ v for (i,v) in enumerate(s) if i%2 ==0 ]
print(''.join(s))
Question 93:
Please write a program which prints all permutations of [1,2,3]
解法一
import itertools
result = list(itertools.permutations([1,2,3]))
print(result)Question 94:
*Write a program to solve a classic ancient Chinese puzzle:
We count 35 heads and 94 legs among the chickens and rabbits in a farm. How many rabbits and how many chickens do we have?* (鸡兔同笼)
解法一
def solve(numheads,numlegs):
ns='No solutions!'
for i in range(numheads+1):
j=numheads-i
if 2*i+4*j==numlegs:
return i,j
return ns,ns
numheads=35
numlegs=94
solutions=solve(numheads,numlegs)
print（solutions）Question 95:
Given the participants' score sheet for your University Sports Day, you are required to find the runner-up score. You are given scores. Store them in a list and find the score of the runner-up.
If the following string is given as input to the program:
5 2 3 6 6 5Then, the output of the program should be:
5
解法一
n = int(input())
arr = map(int, input().split())
arr = list(set(arr))
arr.sort()
print(arr[-2])解法二
n = int(input())
arr = map(int, input().split())
arr = list(set(arr))
print(sorted(arr)[-2])Question 96:
*You are given a string S and width W.
Your task is to wrap the string into a paragraph of width.*If the following string is given as input to the program:
ABCDEFGHIJKLIMNOQRSTUVWXYZ 4Then, the output of the program should be:
ABCD EFGH IJKL IMNO QRST UVWX YZ
解法一
import textwrap
def wrap(string, max_width):
string = textwrap.wrap(string,max_width)
string = "\n".join(string)
return string
if __name__ == '__main__':
string, max_width = input(), int(input())
result = wrap(string, max_width)
print(result)
解法二
import itertools as it
def grouper(lst, n, fillvalue=None):
iters = [iter(lst)] * n
return it.zip_longest(*iters, fillvalue=fillvalue) # 默认就是None
string, max_width = input(), int(input())
result = grouper(string, max_width)
print(list(result))
Question 97:
You are given an integer, N. Your task is to print an alphabet ranGoli of size N. (Rangoli is a fORM of Indian folk art based on creation of patterns.)
Different sizes of alphabet rangoli are shown below:
#size 3 ----c---- --c-b-c-- c-b-a-b-c --c-b-c-- ----c---- #size 5 --------e-------- ------e-d-e------ ----e-d-c-d-e---- --e-d-c-b-c-d-e-- e-d-c-b-a-b-c-d-e --e-d-c-b-c-d-e-- ----e-d-c-d-e---- ------e-d-e------ --------e--------
解法一
import string
def print_rangoli(size):
n = size
alph = string.ascii_lowercase
width = 4 * n - 3
ans = []
for i in range(n):
left = '-'.join(alph[n - i - 1:n])
mid = left[-1:0:-1] + left
final = mid.center(width, '-')
ans.append(final)
if len(ans) > 1:
for i in ans[n - 2::-1]:
ans.append(i)
ans = '\n'.join(ans)
print(ans)
if __name__ == '__main__':
n = int(input())
print_rangoli(n)
Question 98:
You are given a date. Your task is to find what the day is on that date.
Input
A single line of input containing the space separated month, day and year, respectively, in MM DD YYYY format.
08 05 2015
Output
Output the correct day in capital letters.
WEDNESDAY
解法一
import calendar
month, day, year = map(int, input().split())
dayId = calendar.weekday(year, month, day)
print(calendar.day_name[dayId].upper())
解法二
import datetime
month, day, year = map(int, input().split())
dayId = datetime.date(year, month, day)
print(dayId.strftime("%A"))Question 99:
Given 2 sets of integers, M and N, print their symmetric difference in ascending order. The term symmetric difference indicates those values that exist in either M or N but do not exist in both.
Input
The first line of input contains an integer, M.The second line contains M space-separated integers.The third line contains an integer, N.The fourth line contains N space-separated integers.
4 2 4 5 9 4 2 4 11 12
Output
Output the symmetric difference integers in ascending order, one per line.
5 9 11 12
解法一
if __name__ == '__main__':
n = int(input())
set1 = set(map(int,input().split()))
m = int(input())
set2 = set(map(int, input().split()))
ans = list(set1 ^ set2)
print(sorted(ans))
Question 100:
You are given Words. Some words may repeat. For each word, output its number of occurrences. The output order should correspond with the input order of appearance of the word. See the sample input/output for clarification.
If the following string is given as input to the program:
4 bcdef abcdefg bcde bcdefThen, the output of the program should be:
3 2 1 1
解法一
n = int(input())
word_list = []
word_dict = {}
for i in range(n):
word = input()
if word not in word_dict:
word_list.append(word)
word_dict[word] = word_dict.get(word, 0) + 1
print(len(word_list))
for word in word_list:
print(word_dict[word], end=' ')
这十道题的代码在我的GitHub上，如果大家想看一下每道题的输出结果，可以点击以下链接下载：
- python 91-100题
我的运行环境Python 3.6+,如果你用的是Python 2.7版本，绝大多数不同就体现在以下3点：
- raw_input()在python3中是input()
- print需要加括号
- fstring可以换成.format(),或者%s，%d
到今天为止，这套题就已经全部结束了，相信大家如果看了每一道题，还是对技能提升有些许帮助的！
如果你有更好的Python学习资料，想要分享或者交流，欢迎给我留言哈！
- 进入我的个人主页
独乐乐不如众乐乐，大家一起进步，谢谢！
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