Syntax error Program to find length of longest word that can be formed from given letters in python

Program to find length of longest word that can be formed from given letters in python

Suppose we have a list of words and a string called letters, we have to find the size of the longest word that can be made by rearranging the given letters. In the letters there may be asterisk character (*) it can match any character. And it is not necessary to use all the letters.

So, if the input is like words = ["prince", "rice", "price", "limit", "hello"] letters = "*r**ce*", then the output will be 6, as the longest word we can make is "prince" the length is 6.

To solve this, we will follow these steps:

  • has := a map containing letters and frequencies of each element in letters
  • Define a function valid() . This will take s
  • need := a map containing letters and frequencies of each element in s
  • extra := sum of all elements of (maximum of 0 and need[char] - has[char] for all char in need)
  • return true when extra <= has["*"]
  • From the main method do the following:
  • return maximum of all elements in the list [size of word for all word in words when word is valid]

Let us see the following implementation to get better understanding:

Example 

Live Demo

from collections import Counter

class Solution:
   def solve(self, words, letters):
      has = Counter(letters)

      def valid(s):
         need = Counter(s)
         extra = sum([max(0, need[char] - has[char]) for char in need])
         return extra <= has["*"]

      return max([len(word) for word in words if valid(word)])

ob = Solution()
words = ["prince", "rice", "price", "limit", "hello"]
letters = "*r**ce*"
print(ob.solve(words, letters))

Input

["prince", "rice", "price", "limit", "hello"], "*r**ce*"

Output

6
Updated on: 2020-11-26T08:27:28+05:30

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