AtCoder Beginner Contest 135
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Problem Statement
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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.
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- 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$s$.
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Note
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- 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.
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Constraints
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$1 \leq |s| \leq 5 \times 10^5$$1 \leq |t| \leq 5 \times 10^5$$s$and$t$consist of lowercase English letters.
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Input
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Input is given from Standard Input in the following format:
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s
t
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Output
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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.
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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。