README_EN.md

01.09. String Rotation

中文文档

Description

Given two strings, s1 and s2, write code to check if s2 is a rotation of s1 (e.g.,"waterbottle" is a rotation of"erbottlewat"). Can you use only one call to the method that checks if one word is a substring of another?

Example 1:

Input: s1 = "waterbottle", s2 = "erbottlewat"

Output: True

Example 2:

Input: s1 = "aa", "aba"

Output: False

 

Note:

1. 0 <= s1.length, s1.length <= 100000

Solutions

Python3

class Solution:
    def isFlipedString(self, s1: str, s2: str) -> bool:
        return len(s1) == len(s2) and s1 in (s2 * 2)

Java

class Solution {
    public boolean isFlipedString(String s1, String s2) {
        return s1.length() == s2.length() && (s2 + s2).indexOf(s1) != -1;
    }
}

Go

func isFlipedString(s1 string, s2 string) bool {
	return len(s1) == len(s2) && strings.Contains(s1+s1, s2)
}

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