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 PyPy3 (2.4.0) (judge verdict: Accepted)

import sys

def input():
    return sys.stdin.readline().rstrip('\n')

N = int(input())
S = input()
#D = list(map(int, input().split()))

if N % 2 == 1:
    print('No')
    sys.exit()

s1 = S[:N//2]
s2 = S[N//2:]

if s1 == s2:
    print('Yes')
else:
    print('No')