1400-construct-k-palindrome-strings.py

"""
Problem Link: https://leetcode.com/problems/construct-k-palindrome-strings/

Given a string s and an integer k. You should construct k non-empty palindrome strings 
using all the characters in s.
Return True if you can use all the characters in s to construct k palindrome strings or 
False otherwise.

Example 1:
Input: s = "annabelle", k = 2
Output: true
Explanation: You can construct two palindromes using all characters in s.
Some possible constructions "anna" + "elble", "anbna" + "elle", "anellena" + "b"

Example 2:
Input: s = "leetcode", k = 3
Output: false
Explanation: It is impossible to construct 3 palindromes using all the characters of s.

Example 3:
Input: s = "true", k = 4
Output: true
Explanation: The only possible solution is to put each character in a separate string.

Example 4:
Input: s = "yzyzyzyzyzyzyzy", k = 2
Output: true
Explanation: Simply you can put all z's in one string and all y's in the other string. Both strings will be palindrome.

Example 5:
Input: s = "cr", k = 7
Output: false
Explanation: We don't have enough characters in s to construct 7 palindromes.
 
Constraints:
1 <= s.length <= 10^5
All characters in s are lower-case English letters.
1 <= k <= 10^5
"""
class Solution:
    def canConstruct(self, s: str, k: int) -> bool:
      if len(s) <= k:
        return len(s) == k
      
      alphabets = {}
      for c in s:
        alphabets[c] = alphabets.get(c, 0) + 1
      
      count = sum(value % 2 for value in alphabets.values())
        
      return count <= k