Merge pull request gzc426#769 from MMzhe/patch-50

gzc426 · web-flow · commit c5407ceaaa16 · 2019-02-26T11:07:35.000+08:00
Create sourcema.md
diff --git a/2019.01.14-leetcode257/sourcema.md b/2019.01.14-leetcode257/sourcema.md
@@ -0,0 +1,25 @@
+# leetcode 257
+    class Solution {
+        public List<String> binaryTreePaths(TreeNode root) {
+            List<String> list = new ArrayList<>();
+            if (root == null) {
+                return list;
+            }
+            dfs(root, list,new String());
+            return list;
+        }
+        private void dfs(TreeNode root, List<String> list,String ret) {
+            if (root.left==null&&root.right==null) {
+                ret+=root.val;
+                list.add(ret);
+                return;
+            }
+            ret += root.val + "->";
+            if(root.left!=null){
+            dfs(root.left,list,ret);
+            }
+            if(root.right!=null){
+            dfs(root.right,list,ret);
+            }
+        }
+    }
