Leet Code OJ 344. Reverse String [Difficulty:easy]

Topic:
Write a function that takes a string as input and returns the string reversed.
Example:
Given s = "Hello", Return "Olleh".

Translation:
Write a function that uses a string as input to return the result after it has been reversed.
For example, enter "Hello" and Return "Olleh".

Analysis:
When you convert to a character array, the first and last characters are swapped, the second character is swapped with the penultimate one, and so on.

Java Edition code (time complexity O (n), spatial complexity O (n)):

publicclass Solution {    publicreverseString(String s) {        char[] chars=s.toCharArray();        int len=chars.length;        char temp;        for(int i=0;i<len/2;i++){            temp=chars[i];            chars[i]=chars[len-1-i];            chars[len-1-i]=temp;        }        returnnew String(chars);    }}

Leet Code OJ 344. Reverse String [Difficulty:easy]