#   
## Problem overview

Given two strings, `s1` and `s2`, check if `s1` and `s2` are rotations of each other. The rotation is in the clockwise direction.

## Example
```
s1 = "helloeducative"
s2 = "educativehello"
```

Here, `s2` is the rotated version of `s1`.

#   
## Solution

The first condition to check is whether the two strings are of the same length. If the strings are of different lengths, then we can easily say the two strings are not rotations of each other.

The next steps of the algorithm are as follows:

1. Concatenate one of the strings to itself.
2. Check if the other string is there in the concatenated version of the string from Step 1.


In the image above, `s1` is concatenated to itself and we can find `s2` in the concatenated string of `s1`.

public class Main{

    public static boolean check(String s1, String s2) {
        if (s1.length() != s2.length()) return false;
        String concatenatedString = s1 + s1;
        return concatenatedString.contains(s2);
    }

    public static void main(String[] args) {
        String s1 = "helloeducative";
        String s2 = "educativehello";
        boolean flag = check(s1, s2);
        if(flag) System.out.println(s1 + " and " + s2 + " are rotation of each other");
        else System.out.println(s1 + " and " + s2 + " are not rotation of each other");
    }
}


Java

def check(s1, s2):
  if len(s1) != len(s2): return false
  concat_str = s1 + s1
  return s2 in concat_str

if __name__ == "__main__":
  s1 = "helloeducative";
  s2 = "educativehello";
  if(check(s1, s2)): print("{0} and {1} are rotations of each other".format(s1, s2))
  else: print("{0} and {1} are rotations of each other".format(s1, s2))

Python

How to check if strings are rotations of each other in Java

Check if strings are of the same length. Concatenate one string to itself. Check if the other string is a substring.