B - String Palindrome
B - String Palindrome
Score : $200$ points
Problem Statement
A string $S$ of an odd length is said to be a strong palindrome if and only if all of the following conditions are satisfied:
- $S$ is a palindrome.
- Let $N$ be the length of $S$. The string formed by the $1$-st through $((N-1)/2)$-th characters of $S$ is a palindrome.
- The string consisting of the $(N+3)/2$-st through $N$-th characters of $S$ is a palindrome.
Determine whether $S$ is a strong palindrome.
Constraints
- $S$ consists of lowercase English letters.
- The length of $S$ is an odd number between $3$ and $99$ (inclusive).
Input
Input is given from Standard Input in the following format:
Output
If $S$ is a strong palindrome, print Yes;
otherwise, print No.
akasaka
Yes
- $S$ is
akasaka. - The string formed by the $1$-st through the $3$-rd characters is
aka. - The string formed by the $5$-th through the $7$-th characters is
aka. All of these are palindromes, so $S$ is a strong palindrome.
level
No
atcoder
No