Java solution, constant time, a two line code :)


  • 0
    S

    String builder because, String objects are immutable so there'll be n objects if we try using String, whereas StringBuilder is mutable, also it has an existing reverse function available :)

    class Solution {
        public String reverseString(String s) {
            StringBuilder r = new StringBuilder(s);        
            return r.reverse().toString();
        }
    }
    

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