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.

Input : string1 = "amazon" 
        string2 = "azonam"  // rotated anti-clockwise
Output : Yes

Input : string1 = "amazon"
        string2 = "onamaz"  // rotated clockwise
Output : Yes

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.
// C++ program to check if a string is two time
// rotation of another string.
using namespace std;

// Function to check if string2 is obtained by
// string 1
bool isRotated(string str1, string str2)
    if (str1.length() != str2.length())
        return false;

    string clock_rot = "";
    string anticlock_rot = "";
    int len = str2.length();

    // Initialize string as anti-clockwise rotation
    anticlock_rot = anticlock_rot +
                    str2.substr(len-2, 2) +
                    str2.substr(0, len-2) ;

    // Initialize string as clock wise rotation
    clock_rot = clock_rot +
                str2.substr(2) +
                str2.substr(0, 2) ;

    // check if any of them is equal to string1
    return ( == 0 ||
   == 0);

// Driver code
int main()
    string str1 = "geeks";
    string str2 = "eksge";

    isRotated(str1, str2) ? cout << "Yes"
                          : cout << "No";
    return 0;



Exercise : Check if string2 is obtained by rotating string1 by k places.

Reference :

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