Problem:
Score : 200 points

Problem Statement

Given are a positive integer N and a string S of length N consisting of lowercase English letters.

Determine whether the string is a concatenation of two copies of some string.
That is, determine whether there is a string T such that S = T + T.

Constraints

1 \leq N \leq 100

S consists of lowercase English letters.

|S| = N

Input

Input is given from Standard Input in the following format:

N
S

Output

If S is a concatenation of two copies of some string, print Yes; otherwise, print No.

Sample Input 1

6
abcabc

Sample Output 1

Yes

Let T = abc, and S = T + T.

Sample Input 2

6
abcadc

Sample Output 2

No

Sample Input 3

1
z

Sample Output 3

No

Solution in Rust (1.42.0) (judge verdict: Accepted)

use proconio::{fastout, input, marker::Chars};
#[allow(unused_mut)]
#[fastout]
fn main() {
    input! {
        _n: usize,
        s: Chars
    }
    let mut res = true;
    if s[..s.len() / 2] != s[s.len() / 2..] {
        res = false;
    }
    println!("{}", if res { "Yes" } else { "No" });
}