class Solution {
public void reverseString(char[] s) {
for (int left = 0,right=s.length-1; left < right; ++left,--right) {
char temp=s[left];
s[left]=s[right];
s[right]=temp;
}
}
}
class Solution {
public void reverseString(char[] s) {
for (int left = 0,right=s.length-1; left < right; ++left,--right) {
char temp=s[left];
s[left]=s[right];
s[right]=temp;
}
}
}