lizncu

Java

class Solution {
  public void reverseString(char[] s) {
    char t;

    for (int i = 0; i < s.length / 2; i++) {
      t = s[i];
      s[i] = s[s.length - i - 1];
      s[s.length - i - 1] = t;
    }
  }
}