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krahets 2023-05-10 20:59:33 +08:00
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2
chapter_backtracking/backtracking_algorithm.md
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在每次“尝试”中，我们通过将当前节点添加进 `path` 来记录路径；而在“回退”前，我们需要将该节点从 `path` 中弹出，**以恢复本次尝试之前的状态**。换句话说，**我们可以将尝试和回退理解为“前进”与“撤销”**，两个操作是互为相反的。
=== "<1>"
![preorder_find_paths_step1](backtracking_algorithm.assets/preorder_find_paths_step1.png)
![尝试与回退](backtracking_algorithm.assets/preorder_find_paths_step1.png)
=== "<2>"
![preorder_find_paths_step2](backtracking_algorithm.assets/preorder_find_paths_step2.png)

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chapter_searching/replace_linear_by_hashing.md
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@ -203,7 +203,7 @@ comments: true
2. 将键值对 `num[i]` 和索引 `i` 添加进哈希表；
=== "<1>"
![two_sum_hashtable_step1](replace_linear_by_hashing.assets/two_sum_hashtable_step1.png)
![辅助哈希表求解两数之和](replace_linear_by_hashing.assets/two_sum_hashtable_step1.png)
=== "<2>"
![two_sum_hashtable_step2](replace_linear_by_hashing.assets/two_sum_hashtable_step2.png)

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chapter_sorting/counting_sort.md
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@ -287,7 +287,7 @@ $$
遍历完成后，数组 `res` 中就是排序好的结果，最后使用 `res` 覆盖原数组 `nums` 即可。
=== "<1>"
![counting_sort_step1](counting_sort.assets/counting_sort_step1.png)
![计数排序步骤](counting_sort.assets/counting_sort_step1.png)
=== "<2>"
![counting_sort_step2](counting_sort.assets/counting_sort_step2.png)

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chapter_tree/binary_search_tree.md
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- 若 `cur.val = num` ，说明找到目标节点，跳出循环并返回该节点；
=== "<1>"
![bst_search_step1](binary_search_tree.assets/bst_search_step1.png)
![二叉搜索树查找节点示例](binary_search_tree.assets/bst_search_step1.png)
=== "<2>"
![bst_search_step2](binary_search_tree.assets/bst_search_step2.png)
@ -620,7 +620,7 @@ comments: true
3. 用 `tmp` 的值覆盖待删除节点的值；
=== "<1>"
![bst_remove_case3_step1](binary_search_tree.assets/bst_remove_case3_step1.png)
![二叉搜索树删除节点示例](binary_search_tree.assets/bst_remove_case3_step1.png)
=== "<2>"
![bst_remove_case3_step2](binary_search_tree.assets/bst_remove_case3_step2.png)

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chapter_tree/binary_tree_traversal.md
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@ -651,7 +651,7 @@ comments: true
递归过程可分为“递”和“归”两个相反的部分。“递”表示开启新方法，程序在此过程中访问下一个节点；“归”表示函数返回，代表该节点已经访问完毕。如下图所示，为前序遍历二叉树的递归过程。
=== "<1>"
![preorder_step1](binary_tree_traversal.assets/preorder_step1.png)
![前序遍历的递归过程](binary_tree_traversal.assets/preorder_step1.png)
=== "<2>"
![preorder_step2](binary_tree_traversal.assets/preorder_step2.png)