103221: [Atcoder]ABC322 B - Prefix and Suffix

Memory Limit:256 MB Time Limit:2 S
Judge Style:Text Compare Creator:
Submit:11 Solved:0

Description

Score : $200$ points

Problem Statement

You are given two strings $S$ and $T$ consisting of lowercase English letters. The lengths of $S$ and $T$ are $N$ and $M$, respectively. (The constraints guarantee that $N \leq M$.)

$S$ is said to be a prefix of $T$ when the first $N$ characters of $T$ coincide $S$.
$S$ is said to be a suffix of $T$ when the last $N$ characters of $T$ coincide $S$.

If $S$ is both a prefix and a suffix of $T$, print $0$;
If $S$ is a prefix of $T$ but not a suffix, print $1$;
If $S$ is a suffix of $T$ but not a prefix, print $2$;
If $S$ is neither a prefix nor a suffix of $T$, print $3$.

Constraints

  • $1 \leq N \leq M \leq 100$
  • $S$ is a string of length $N$ consisting of lowercase English letters.
  • $T$ is a string of length $M$ consisting of lowercase English letters.

Input

The input is given from Standard Input in the following format:

$N$ $M$
$S$
$T$

Output

Print the answer according to the instructions in the problem statement.


Sample Input 1

3 7
abc
abcdefg

Sample Output 1

1

$S$ is a prefix of $T$ but not a suffix, so you should print $1$.


Sample Input 2

3 4
abc
aabc

Sample Output 2

2

$S$ is a suffix of $T$ but not a prefix.


Sample Input 3

3 3
abc
xyz

Sample Output 3

3

$S$ is neither a prefix nor a suffix of $T$.


Sample Input 4

3 3
aaa
aaa

Sample Output 4

0

$S$ and $T$ may coincide, in which case $S$ is both a prefix and a suffix of $T$.

Output

分数:200分

问题描述

给你两个由小写英文字母组成的字符串$S$和$T$。$S$和$T$的长度分别为$N$和$M$(约束条件保证了$N \leq M$)。

当$T$的前$N$个字符与$S$相同,我们称$S$为$T$的前缀

当$T$的后$N$个字符与$S$相同,我们称$S$为$T$的后缀

如果$S$既是$T$的前缀又是后缀,输出0;
如果$S$是$T$的前缀但不是后缀,输出1;
如果$S$是$T$的后缀但不是前缀,输出2;
如果$S$既不是$T$的前缀也不是后缀,输出3。

约束条件

  • $1 \leq N \leq M \leq 100$
  • $S$是一个长度为$N$的由小写英文字母组成的字符串。
  • $T$是一个长度为$M$的由小写英文字母组成的字符串。

输入

输入将从标准输入中给出,如下所示:

$N$ $M$
$S$
$T$

输出

根据问题描述中的指示输出答案。


样例输入1

3 7
abc
abcdefg

样例输出1

1

$S$是$T$的前缀但不是后缀,所以你应该输出1。


样例输入2

3 4
abc
aabc

样例输出2

2

$S$是$T$的后缀但不是前缀。


样例输入3

3 3
abc
xyz

样例输出3

3

$S$既不是$T$的前缀也不是后缀。


样例输入4

3 3
aaa
aaa

样例输出4

0

$S$和$T$可能相同,在这种情况下,$S$既是$T$的前缀又是后缀。

HINT

判断字符串s和t的关系,前缀?后缀?前后缀?都不是?

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