Leetcode 344. Reverse String

算法 Java Leetcode

Takes a string as input and returns the string reversed.

Question

Write a function that takes a string as input and returns the string reversed.
See it on Leetcode

Example: Given s = "hello", return "olleh".

Hint

Should pay attention to the null parameter judgement.

Solution

• java
• cpp

public class Solution {
    public String reverseString(String s) {
        char[] chars = new char[s.length()];  
        int index = 0;  
        for (int i = s.length() - 1; i >= 0; i--) {  
            chars[index++] = s.charAt(i);  
        }  
        return new String(chars);  
    }
}

class Solution {
public:
    string reverseString(string s) {
        if (s == "") return s;
        string reverseString = s;
        for (int i = 0;i<=s.length()-1;i++){
            reverseString[i]=s[s.length()-1-i];
        }
        return reverseString;
    }
};