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"]
Example 2:
Input: s = ["H","a","n","n","a","h"] Output: ["h","a","n","n","a","H"]
Constraints:
1 <= s.length <= 105s[i] is a printable ascii character.class Solution {
public:
void reverseString(vector<char>& s) {
int lt=0, rt=s.size()-1;
while(lt<rt){
swap(s[lt++], s[rt--]);
}
}
};class Solution {
public:
void reverseString(vector<char>& s) {
int lt=0, rt=s.size()-1;
while(lt<rt)
swap(s[lt++],s[rt--]);
}
};class Solution {
public void reverseString(char[] s) {
int lt = 0, rt = s.length-1;
while(lt<rt){
char temp = s[lt];
s[lt++] = s[rt];
s[rt--] = temp;
}
}
}