Reverse String

Reverse String

Write a function that reverses a string. The input string is given as an array of characters char[].

Do not allocate extra space for another array, you must do this by modifying the input array in-place with O(1) extra memory.

You may assume all the characters consist of printable ascii characters.

Example 1:

Input: ["h","e","l","l","o"]
Output: ["o","l","l","e","h"]

Example 2:

Input: ["H","a","n","n","a","h"]
Output: ["h","a","n","n","a","H"]

Solutions

🧠 Cpp

class Solution
{
public:
    void reverseString(vector<char>& s)
    {
        const size_t size = s.size();
        for(int i = 0; i < size/2; ++i)
            std::swap(s[i], s[size-1-i]);
    }
};