Yuwei Zhan
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comments of
Yuwei Zhan
``` public class ReverseString { static String reverse(String str) { StringBuffer newStr = new StringBuffer(); for (int i = str.length() - 1; i >= 0; i--) newStr.append(str.charAt(i)); return newStr.toString(); }...
``` java import java.util.*; /** * public class TreeNode { * int val; * TreeNode left; * TreeNode right; * TreeNode(int x) {val = x;} * } */ public class...