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Split the Str Ing codechef October Cook off challenge solution

 Split the Str Ing codechef October Cook off challenge solution -


Problem Statement-

You are given a string S with length N. Determine if it is possible to find two non-empty strings A and B which satisfy the following conditions:

  • A+B=S, where + denotes string concatenation
  • B is a substring of A

Note: B is a substring of A if B can be obtained from A by deleting several (possibly zero) characters from the beginning and several (possibly zero) characters from the end. For example, "ab" is a substring of "cabd", but "ad" is not.


Input

  • The first line of the input contains a single integer T denoting the number of test cases. The description of T test cases follows.
  • The first line of each test case contains a single integer N.
  • The second line contains a single string S.

Output

For each test case, print a single line containing the string "YES" if it is possible to find strings A and B satisfying the given conditions or "NO" otherwise (without quotes).

Constraints

  • 1T104
  • 2N105
  • |S|=N
  • S contains only lowercase English letters
  • the sum of N over all test cases does not exceed 106

Example Input

5
6
cabdab
21
yourcrushlovesyouback
16
wubbalubbadubdub
5
split
7
splitit

Example Output

YES
NO
YES
NO
YES

Explanation

Example case 1: We can choose "cabd" as A and "ab" as B. We can see that A+B=S and B is a substring of A.

Example case 2: It is impossible to find two strings which satisfy the constraints. For example, when A is "yourcrushlovesyou" and B is "back", then A+B=S, but B is not a substring of A.

Example case 3: We can choose "wubbalubbadub" as A and "dub" as B.

Problem link=https://www.codechef.com/COOK123B/problems/SPLITIT

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Split the Str Ing codechef solution-

Actually do not think So much its ways problem as mentioned in A+B=S and  B is a substring of A.
So My Logic is it is necessary that is if B is a substring of A so Las character of B must be present in A otherwise B cannot be a Substring of A. 
So 
I will check only for last charter of string S if it is present in A I will Print Yes Otherwise I will Print NO.

Here Is my Code-


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