Codeforces Round #620 (Div. 2) B. Longest Palindrome
Returningbacktoproblemsolving,Gildongisnowstudyingaboutpalindromes.Helearnedthatapalindromeisastringthatisthesameasitsreverse.Forexample,strings"pop","noon","x",and"kkkkkk"arepalindromes,whilestrings"