Google – Longest Palindrome By Remove or Rearrange



Google – Longest Palindrome By Remove or Rearrange

[Problem]
Input一个string, 可以删字母,也可以重写排列字母,要求返回一个longest palindrome.

[Solution]
和leetcode 266 Palindrome Permutation很像,要使得input的string成为Palindrome, 那最多只能有一个字符has odd frequency. 那么就用一个hash table统计下所有字母的frequency,要是有1个以上的字母has odd frequency,留下最多的那个,其他全部删掉。然后重新build palindrome就可以了。

代码懒得写了,基本就和palindrome permutation i & ii一样。


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