Merge pull request gzc426#314 from za1275952454/master

gzc426 · web-flow · commit e7c676159dbe · 2018-12-05T13:05:13.000+08:00
1
diff --git a/2018.12.04-leetcode101/fish.md b/2018.12.04-leetcode101/fish.md
@@ -0,0 +1,58 @@
+```
+class Solution {
+    public boolean isSymmetric(TreeNode treeNode) {
+        if (treeNode == null) {
+            return true;
+        }else {
+            return isSymmetric(treeNode.getLeft(), treeNode.getRight());
+        }
+    }
+
+    public boolean isSymmetric(TreeNode left, TreeNode right) {
+        if (left == null && right == null) {
+            return true;
+        }
+        if (left == null || right == null) {
+            return false;
+        }
+        if (left.getVal() != right.getVal()) {
+            return false;
+        }
+        return isSymmetric(left.getLeft(), right.getRight()) && isSymmetric(left.getRight(), right.getLeft());
+    }
+}
+class TreeNode{
+    private int val;
+    private TreeNode left;
+    private TreeNode right;
+
+    public TreeNode(int val, TreeNode left, TreeNode right) {
+        this.val = val;
+        this.left = left;
+        this.right = right;
+    }
+
+    public int getVal() {
+        return val;
+    }
+
+    public void setVal(int val) {
+        this.val = val;
+    }
+
+    public TreeNode getLeft() {
+        return left;
+    }
+
+    public void setLeft(TreeNode left) {
+        this.left = left;
+    }
+
+    public TreeNode getRight() {
+        return right;
+    }
+
+    public void setRight(TreeNode right) {
+        this.right = right;
+    }
+}
diff --git a/2018.12.3-leetcode58/fish.md b/2018.12.3-leetcode58/fish.md
@@ -0,0 +1,13 @@
+>给定一个仅包含大小写字母和空格 ' ' 的字符串，返回其最后一个单词的长度。
+>如果不存在最后一个单词，请返回 0 。  
+>说明：一个单词是指由字母组成，但不包含任何空格的字符串。
+
+```
+public static int lengthOfLastWord(String str){  
+  String trim = str.trim();
+  if (str.matches("[a-zA-Z ]*") && !trim.isEmpty()) {
+      int index = trim.lastIndexOf(' ');
+      return index < 0 ? trim.length() : trim.length() - index - 1;
+  }
+  return 0;
+}
