AtCoder Beginner Contest 135
F
Strings of Eternity
AtCoder
⌀ 2388
原题
← E→
翻译中…

Problem Statement

翻译中…

Given are two strings $s$ and $t$ consisting of lowercase English letters. Determine if the number of non-negative integers $i$ satisfying the following condition is finite, and find the maximum value of such $i$ if the number is finite.

翻译中…
  • There exists a non-negative integer $j$ such that the concatenation of $i$ copies of $t$ is a substring of the concatenation of $j$ copies of $s$.
翻译中…

Note

翻译中…
  • A string $a$ is a substring of another string $b$ if and only if there exists an integer $x$ $(0 \leq x \leq |b| - |a|)$ such that, for any $y$ $(1 \leq y \leq |a|)$, $a_y = b_{x+y}$ holds.
  • We assume that the concatenation of zero copies of any string is the empty string. From the definition above, the empty string is a substring of any string. Thus, for any two strings $s$ and $t$, $i = 0$ satisfies the condition in the problem statement.
翻译中…

Constraints

翻译中…
  • $1 \leq |s| \leq 5 \times 10^5$
  • $1 \leq |t| \leq 5 \times 10^5$
  • $s$ and $t$ consist of lowercase English letters.
翻译中…

Input

翻译中…

Input is given from Standard Input in the following format:

翻译中…

s
t

翻译中…

Output

翻译中…

If the number of non-negative integers $i$ satisfying the following condition is finite, print the maximum value of such $i$; if the number is infinite, print -1.

翻译中…

样例

Input #1
abcabab
ab
Output #1
3
The concatenation of three copies of $t$, `ababab`, is a substring of the concatenation of two copies of $s$, `abcabababcabab`, so $i = 3$ satisfies the condition. On the other hand, the concatenation of four copies of $t$, `abababab`, is not a substring of the concatenation of any number of copies of $s$, so $i = 4$ does not satisfy the condition. Similarly, any integer greater than $4$ does not satisfy the condition, either. Thus, the number of non-negative integers $i$ satisfying the condition is finite, and the maximum value of such $i$ is $3$.
Input #2
aa
aaaaaaa
Output #2
-1
For any non-negative integer $i$, the concatenation of $i$ copies of $t$ is a substring of the concatenation of $4i$ copies of $s$. Thus, there are infinitely many non-negative integers $i$ that satisfy the condition.
Input #3
aba
baaab
Output #3
0
As stated in Notes, $i = 0$ always satisfies the condition.
题目信息
题号
abc135_f
时间限制
2 s
内存限制
1024 MB

题面与样例版权归 AtCoder 及出题人所有;中文翻译由 AI 生成(CI 管线),如有出入请以原文为准。