344 - Reverse String

#easy

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

You must do this by modifying the input array in-place with O(1) extra memory.

Example 1:
Input: s = ["h","e","l","l","o"]
Output: ["o","l","l","e","h"]

class Solution {
public:
    void reverseString(vector<char>& s) {
        int i = 0;
        int j = s.size() - 1;
        while ( i < j ) {
            swap(s[i],s[j]);
            i++;
            j--;
        }

    }

void reverseString(char* s, int sSize){
    char * start = s;
    for ( int i = 0; sSize / 2 > i; i++ ) {
        char temp = s[i];
        s[i] = s[sSize-1-i];
        s[sSize-1-i] = temp;
    }

    return start;
}