Write a function that takes a string, s, as an input and determines whether or not it is a palindrome.

Note: A palindrome is a word, phrase, or sequence of characters that reads the same backward as forward.


  • 11 \leq s.length 2×105\leq 2 \times 10^5
  • The string s will not contain any white space and will only consist of ASCII characters(digits and letters).

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