Question: A string x 1 x 2 . . . xn is a palindrome, if xi = xn i + 1 for 1 i n .

A string x

1

2 . . .

xn is a palindrome, if xi

=

+ 1

for

1

.

Give an efficient algorithm for finding the longest palindromic subsequence of a given string. Determine and state clearly its time complexity and space requirement.

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