String Modification
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Description
Vasya has a string $s$ of length $n$. He decides to make the following modification to the string:
- Pick an integer $k$, ($1 \leq k \leq n$).
- For $i$ from $1$ to $n-k+1$, reverse the substring $s[i:i+k-1]$ of $s$. For example, if string $s$ is qwer and $k = 2$, below is the series of transformations the string goes through:
- qwer (original string)
- wqer (after reversing the first substring of length $2$)
- weqr (after reversing the second substring of length $2$)
- werq (after reversing the last substring of length $2$)
Vasya wants to choose a $k$ such that the string obtained after the above-mentioned modification is lexicographically smallest possible among all choices of $k$. Among all such $k$, he wants to choose the smallest one. Since he is busy attending Felicity 2020, he asks for your help.
A string $a$ is lexicographically smaller than a string $b$ if and only if one of the following holds:
- $a$ is a prefix of $b$, but $a \ne b$;
- in the first position where $a$ and $b$ differ, the string $a$ has a letter that appears earlier in the alphabet than the corresponding letter in $b$.
Each test contains multiple test cases.
The first line contains the number of test cases $t$ ($1 \le t \le 5000$). The description of the test cases follows.
The first line of each test case contains a single integer $n$ ($1 \le n \le 5000$) — the length of the string $s$.
The second line of each test case contains the string $s$ of $n$ lowercase latin letters.
It is guaranteed that the sum of $n$ over all test cases does not exceed $5000$.
For each testcase output two lines:
In the first line output the lexicographically smallest string $s'$ achievable after the above-mentioned modification.
In the second line output the appropriate value of $k$ ($1 \leq k \leq n$) that you chose for performing the modification. If there are multiple values of $k$ that give the lexicographically smallest string, output the smallest value of $k$ among them.
Input
Each test contains multiple test cases.
The first line contains the number of test cases $t$ ($1 \le t \le 5000$). The description of the test cases follows.
The first line of each test case contains a single integer $n$ ($1 \le n \le 5000$) — the length of the string $s$.
The second line of each test case contains the string $s$ of $n$ lowercase latin letters.
It is guaranteed that the sum of $n$ over all test cases does not exceed $5000$.
Output
For each testcase output two lines:
In the first line output the lexicographically smallest string $s'$ achievable after the above-mentioned modification.
In the second line output the appropriate value of $k$ ($1 \leq k \leq n$) that you chose for performing the modification. If there are multiple values of $k$ that give the lexicographically smallest string, output the smallest value of $k$ among them.
6
4
abab
6
qwerty
5
aaaaa
6
alaska
9
lfpbavjsm
1
p
abab
1
ertyqw
3
aaaaa
1
aksala
6
avjsmbpfl
5
p
1
Note
In the first testcase of the first sample, the string modification results for the sample abab are as follows :
- for $k = 1$ : abab
- for $k = 2$ : baba
- for $k = 3$ : abab
- for $k = 4$ : baba
The lexicographically smallest string achievable through modification is abab for $k = 1$ and $3$. Smallest value of $k$ needed to achieve is hence $1$.
20240507集训
- Status
- Done
- Rule
- IOI
- Problem
- 6
- Start at
- 2024-5-7 19:00
- End at
- 2024-5-7 21:00
- Duration
- 2 hour(s)
- Host
-
SamuelXuch
- Partic.
- 12