Count minimum swap to make string palindrome

Input: aabcb
Output: 3
Explanation:
After 1st swap: abacb
After 2nd swap: abcab
After 3rd swap: abcba
Input: adbcdbad
Output: -1

--

--

Get the Medium app

A button that says 'Download on the App Store', and if clicked it will lead you to the iOS App store
A button that says 'Get it on, Google Play', and if clicked it will lead you to the Google Play store