Assume you have a method isSubstring which checks if one word is a substring of another. Given two strings, s1 and s2, write code to check if s2 is a rotation of s1 using only one call to isSubstring(e.g. "waterbottle" is a rotation of "erbottlewat").
O(n)
O(n)
Run make to build and run C++ files and run Swift files. Or you can run .playground file.