Python3 Program to Check if a string can be obtained by rotating another string 2 places
Given two strings, the task is to find if a string can be obtained by rotating another string two places.
Examples:
Input: string1 = “amazon”, string2 = “azonam”
Output: Yes
// rotated anti-clockwise
Input: string1 = “amazon”, string2 = “onamaz”
Output: Yes
// rotated clockwise
Asked in: Amazon Interview
1- There can be only two cases:
a) Clockwise rotated
b) Anti-clockwise rotated
2- If clockwise rotated that means elements
are shifted in right.
So, check if a substring[2.... len-1] of
string2 when concatenated with substring[0,1]
of string2 is equal to string1. Then, return true.
3- Else, check if it is rotated anti-clockwise
that means elements are shifted to left.
So, check if concatenation of substring[len-2, len-1]
with substring[0....len-3] makes it equals to
string1. Then return true.
4- Else, return false.
Below is the implementation of the above approach.
Python3
def isRotated(str1, str2):
if ( len (str1) ! = len (str2)):
return False
if ( len (str1) < 2 ):
return str1 = = str2
clock_rot = ""
anticlock_rot = ""
l = len (str2)
anticlock_rot = (anticlock_rot +
str2[l - 2 :] +
str2[ 0 : l - 2 ])
clock_rot = clock_rot + str2[ 2 :] + str2[ 0 : 2 ]
return (str1 = = clock_rot or
str1 = = anticlock_rot)
if __name__ = = "__main__" :
str1 = "geeks"
str2 = "eksge"
if isRotated(str1, str2):
print ( "Yes" )
else :
print ( "No" )
|
Output:
Yes
Time Complexity: O(n), where n is the size of the given strings.
Please refer complete article on Check if a string can be obtained by rotating another string 2 places for more details!
Last Updated :
23 Aug, 2022
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