From 1600ed6dee49ddd6dbb80675c87e99985c31e7ca Mon Sep 17 00:00:00 2001
From: krahets <krahets@163.com>
Date: Sun, 16 Apr 2023 05:14:15 +0800
Subject: [PATCH] Fix the codes of backtracking.

---
 codes/java/chapter_backtracking/preorder_find_nodes.java       | 3 ---
 .../chapter_backtracking/preorder_find_constrained_paths.py    | 1 -
 codes/python/chapter_backtracking/preorder_find_paths.py       | 1 -
 3 files changed, 5 deletions(-)

diff --git a/codes/java/chapter_backtracking/preorder_find_nodes.java b/codes/java/chapter_backtracking/preorder_find_nodes.java
index 605c0201e..3208b031f 100644
--- a/codes/java/chapter_backtracking/preorder_find_nodes.java
+++ b/codes/java/chapter_backtracking/preorder_find_nodes.java
@@ -15,15 +15,12 @@ public class preorder_find_nodes {
         if (root == null) {
             return;
         }
-        // 尝试
         if (root.val == 7) {
             // 记录解
             res.add(root);
         }
         preOrder(root.left);
         preOrder(root.right);
-        // 回退
-        return;
     }
 
     public static void main(String[] args) {
diff --git a/codes/python/chapter_backtracking/preorder_find_constrained_paths.py b/codes/python/chapter_backtracking/preorder_find_constrained_paths.py
index 8ea42738c..e0670e2e7 100644
--- a/codes/python/chapter_backtracking/preorder_find_constrained_paths.py
+++ b/codes/python/chapter_backtracking/preorder_find_constrained_paths.py
@@ -24,7 +24,6 @@ def pre_order(root: TreeNode) -> None:
     pre_order(root.right)
     # 回退
     path.pop()
-    return
 
 
 """Driver Code"""
diff --git a/codes/python/chapter_backtracking/preorder_find_paths.py b/codes/python/chapter_backtracking/preorder_find_paths.py
index 781d96d8a..59ca81663 100644
--- a/codes/python/chapter_backtracking/preorder_find_paths.py
+++ b/codes/python/chapter_backtracking/preorder_find_paths.py
@@ -23,7 +23,6 @@ def pre_order(root: TreeNode) -> None:
     pre_order(root.right)
     # 回退
     path.pop()
-    return
 
 
 """Driver Code"""