Python程序对句子中的回文词进行排序

给定一个表示句子的字符串S ，任务是按排序顺序对句子中存在的所有回文词重新排序。

例子：

Input: S = “Please refer to the madam to know the level”
Output: Please level to the madam to know the refer
Explanation: Here “refer”, “madam”, “level” are the palindromic words. Sorting them generates the sequence {“level”, “madam”, “refer”}.

Input: S = “refer to dad”
Output: dad to refer

方法：请按照以下步骤解决问题：

• 遍历字符串的字符。
• 用lis分隔句子中的单词，并使用split()将它们分隔成一个列表。
• newlis []说，将句子S中存在的所有回文词存储在一个列表中。
• 使用sort()函数对列表newlis []进行排序。
• 初始化一个指针，说j = 0 。
• 遍历列表LIS和替换全部由1 newlis [J]和增量j中的回文词。
• 打印更新的句子

下面是上述方法的实现：

Python3

# Python implementation of above program
  
# Function to check if a
# string is a palindrome or not
def palindrome(string):
    if(string == string[::-1]):
        return True
    else:
        return False
  
# Function to print the updated sentence
def printSortedPalindromes(sentence):
    
    # Stores palindromic words
    newlist = []
      
    # Stores the words split by spaces
    lis = list(sentence.split())
      
    # Traversing the list
    for i in lis:
        
        # If current word is palindrome
        if(palindrome(i)):
            
            # Update newlist
            newlist.append(i)
  
    # Sort the words in newlist
    newlist.sort()
  
    # Pointer to iterate newlis
    j = 0
      
    # Traverse the list
    for i in range(len(lis)):
        
        # If current word is palindrome
        if(palindrome(lis[i])):
            
            # Replacing word with
            # current word in newlist
            lis[i] = newlist[j]
              
            # Increment j by 1
            j = j + 1
  
    # Print the updated sentence
    for i in lis:
        print(i, end =" ")
  
  
# Driver Code
  
sentence = "please refer to the madam to know the level"
  
printSortedPalindromes(sentence)

输出：

please level to the madam to know the refer

时间复杂度： O(N * logN)
辅助空间： O(N)