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PostOrderTraversal
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‎insert-into-a-binary-search-tree/PostOrderTraversal.ixx‎

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module;
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#include <functional>
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export module insert_into_a_binary_search_tree.PostOrderTraversal;
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import leetcode_treenode_cpp.TreeNode;
6+
using leetcode_treenode_cpp::TreeNode;
7+
namespace insert_into_a_binary_search_tree {
8+
using std::function;
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export void PostOrderTraversal(TreeNode* root, function<void(TreeNode*)> callback)
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{
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if (root == nullptr) {
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return;
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}
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PostOrderTraversal(root->left, callback);
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PostOrderTraversal(root->right, callback);
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callback(root);
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}
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}

‎insert-into-a-binary-search-tree/insert-into-a-binary-search-tree.vcxproj‎

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<ClCompile Include="PostOrderTraversal.ixx" />
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@@ -63,13 +35,6 @@
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</ClCompile>
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<ClCompile Include="debugTreeNode.ixx">
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<FileType>Document</FileType>
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<ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">false</ExcludedFromBuild>

‎insert-into-a-binary-search-tree/insert-into-a-binary-search-tree.vcxproj.filters‎

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<ClCompile Include="PostOrderTraversal.ixx" />
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‎insert-into-a-binary-search-tree/test.cpp‎

Lines changed: 27 additions & 9 deletions
Original file line numberDiff line numberDiff line change
@@ -37,6 +37,7 @@ import leetcode_treenode_cpp.parseLeetCodeBinaryTree;
3737
import insert_into_a_binary_search_tree.Solution;
3838
import insert_into_a_binary_search_tree.HashTreeNode;
3939
import insert_into_a_binary_search_tree.EqualTreeNode;
40+
import insert_into_a_binary_search_tree.PostOrderTraversal;
4041
using namespace insert_into_a_binary_search_tree;
4142
using namespace leetcode_treenode_cpp;
4243
using namespace std;
@@ -67,19 +68,24 @@ void test1()
6768
println("insert-into-a-binary-search-tree");
6869
println("test1 start");
6970
TreeNode* none = NULL;
71+
auto nodes = unordered_set<TreeNode*, HashTreeNode, EqualTreeNode> {};
7072

73+
PostOrderTraversal(none, [&](auto* node) {
74+
nodes.emplace(node);
75+
});
7176
auto result2 = Solution().insertIntoBST(none, 111);
72-
77+
PostOrderTraversal(result2, [&](auto* node) {
78+
nodes.emplace(node);
79+
});
7380
println(serializeTreeNode(none));
7481
assertEquals(serializeTreeNode(none), "null");
7582
println(serializeTreeNode(result2));
7683
assertEquals(serializeTreeNode(result2),
7784
"TreeNode{val:111,left:null,right:null}");
7885

79-
auto nodes = unordered_set<TreeNode*, HashTreeNode, EqualTreeNode> { none, result2 };
8086
for (auto node : nodes) {
8187
printTreeNode(node);
82-
freeTreeNode(node);
88+
delete (node);
8389
}
8490
println("test1 end");
8591
}
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8894
{
8995
println("test2 start");
9096
auto tree = new TreeNode(99);
97+
auto nodes = unordered_set<TreeNode*, HashTreeNode, EqualTreeNode> {};
98+
99+
PostOrderTraversal(tree, [&](auto* node) {
100+
nodes.emplace(node);
101+
});
91102
println(serializeTreeNode(tree));
92103
assertEquals(serializeTreeNode(tree),
93104
"TreeNode{val:99,left:null,right:null}");
94105
auto result = Solution().insertIntoBST(tree, 111);
95-
106+
PostOrderTraversal(result, [&](auto* node) {
107+
nodes.emplace(node);
108+
});
96109
println(serializeTreeNode(result));
97110
assertEquals(serializeTreeNode(result),
98111
"TreeNode{val:99,left:null,right:TreeNode{val:111,left:null,"
99112
"right:null}}");
100113

101-
auto nodes = unordered_set<TreeNode*, HashTreeNode, EqualTreeNode> { tree, result };
102114
for (auto node : nodes) {
103115
printTreeNode(node);
104-
freeTreeNode(node);
116+
delete (node);
105117
}
106118
println("test2 end");
107119
}
@@ -134,17 +146,23 @@ class StringTest : public CppUnit::TestFixture {
134146
TreeNode* root = nullptr;
135147
int status = parseLeetCodeBinaryTree(example.root, &root);
136148
CPPUNIT_ASSERT_EQUAL(0, status);
137-
auto output = Solution().insertIntoBST(root, example.val);
149+
auto nodes = unordered_set<TreeNode*, HashTreeNode, EqualTreeNode> {};
138150

151+
PostOrderTraversal(root, [&](auto* node) {
152+
nodes.emplace(node);
153+
});
154+
auto output = Solution().insertIntoBST(root, example.val);
155+
PostOrderTraversal(output, [&](auto* node) {
156+
nodes.emplace(node);
157+
});
139158
CPPUNIT_ASSERT_EQUAL(LeetCodeTreeNodeToString(output),
140159
example.output);
141160
println(example.root);
142161
println(example.val);
143162
println(example.output);
144-
auto nodes = unordered_set<TreeNode*, HashTreeNode, EqualTreeNode> { root, output };
145163
for (auto node : nodes) {
146164
printTreeNode(node);
147-
freeTreeNode(node);
165+
delete (node);
148166
}
149167
}
150168
}

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