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NextNode.cpp
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executable file
·225 lines (185 loc) · 5.4 KB
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#include <stdio.h>
struct BinaryTreeNode
{
int m_nValue;
BinaryTreeNode* m_pLeft;
BinaryTreeNode* m_pRight;
BinaryTreeNode* m_pParent;
};
BinaryTreeNode* GetNext(BinaryTreeNode* pNode)
{
if(pNode == NULL)
return NULL;
BinaryTreeNode* pNext = NULL;
if(pNode->m_pRight != NULL)
{
BinaryTreeNode* pRight = pNode->m_pRight;
while(pRight->m_pLeft != NULL)
pRight = pRight->m_pLeft;
pNext = pRight;
}
else if(pNode->m_pParent != NULL)
{
BinaryTreeNode* pCurrent = pNode;
BinaryTreeNode* pParent = pNode->m_pParent;
while(pParent != NULL && pCurrent == pParent->m_pRight)
{
pCurrent = pParent;
pParent = pParent->m_pParent;
}
pNext = pParent;
}
return pNext;
}
// ==================== Code for Binary Trees ====================
BinaryTreeNode* CreateBinaryTreeNode(int value)
{
BinaryTreeNode* pNode = new BinaryTreeNode();
pNode->m_nValue = value;
pNode->m_pLeft = NULL;
pNode->m_pRight = NULL;
pNode->m_pParent = NULL;
return pNode;
}
void ConnectTreeNodes(BinaryTreeNode* pParent, BinaryTreeNode* pLeft, BinaryTreeNode* pRight)
{
if(pParent != NULL)
{
pParent->m_pLeft = pLeft;
pParent->m_pRight = pRight;
if(pLeft != NULL)
pLeft->m_pParent = pParent;
if(pRight != NULL)
pRight->m_pParent = pParent;
}
}
void PrintTreeNode(BinaryTreeNode* pNode)
{
if(pNode != NULL)
{
printf("value of this node is: %d\n", pNode->m_nValue);
if(pNode->m_pLeft != NULL)
printf("value of its left child is: %d.\n", pNode->m_pLeft->m_nValue);
else
printf("left child is null.\n");
if(pNode->m_pRight != NULL)
printf("value of its right child is: %d.\n", pNode->m_pRight->m_nValue);
else
printf("right child is null.\n");
}
else
{
printf("this node is null.\n");
}
printf("\n");
}
void PrintTree(BinaryTreeNode* pRoot)
{
PrintTreeNode(pRoot);
if(pRoot != NULL)
{
if(pRoot->m_pLeft != NULL)
PrintTree(pRoot->m_pLeft);
if(pRoot->m_pRight != NULL)
PrintTree(pRoot->m_pRight);
}
}
void DestroyTree(BinaryTreeNode* pRoot)
{
if(pRoot != NULL)
{
BinaryTreeNode* pLeft = pRoot->m_pLeft;
BinaryTreeNode* pRight = pRoot->m_pRight;
delete pRoot;
pRoot = NULL;
DestroyTree(pLeft);
DestroyTree(pRight);
}
}
// ==================== Test Code ====================
void Test(char* testName, BinaryTreeNode* pNode, BinaryTreeNode* expected)
{
if(testName != NULL)
printf("%s begins: ", testName);
BinaryTreeNode* pNext = GetNext(pNode);
if(pNext == expected)
printf("Passed.\n");
else
printf("FAILED.\n");
}
// 8
// 6 10
// 5 7 9 11
void Test1_7()
{
BinaryTreeNode* pNode8 = CreateBinaryTreeNode(8);
BinaryTreeNode* pNode6 = CreateBinaryTreeNode(6);
BinaryTreeNode* pNode10 = CreateBinaryTreeNode(10);
BinaryTreeNode* pNode5 = CreateBinaryTreeNode(5);
BinaryTreeNode* pNode7 = CreateBinaryTreeNode(7);
BinaryTreeNode* pNode9 = CreateBinaryTreeNode(9);
BinaryTreeNode* pNode11 = CreateBinaryTreeNode(11);
ConnectTreeNodes(pNode8, pNode6, pNode10);
ConnectTreeNodes(pNode6, pNode5, pNode7);
ConnectTreeNodes(pNode10, pNode9, pNode11);
PrintTree(pNode8); // now root is pNode8
Test("Test1", pNode8, pNode9);
Test("Test2", pNode6, pNode7);
Test("Test3", pNode10, pNode11);
Test("Test4", pNode5, pNode6);
Test("Test5", pNode7, pNode8);
Test("Test6", pNode9, pNode10);
Test("Test7", pNode11, NULL);
DestroyTree(pNode8);
}
// 5
// 4
// 3
// 2
void Test8_11()
{
BinaryTreeNode* pNode5 = CreateBinaryTreeNode(5);
BinaryTreeNode* pNode4 = CreateBinaryTreeNode(4);
BinaryTreeNode* pNode3 = CreateBinaryTreeNode(3);
BinaryTreeNode* pNode2 = CreateBinaryTreeNode(2);
ConnectTreeNodes(pNode5, pNode4, NULL);
ConnectTreeNodes(pNode4, pNode3, NULL);
ConnectTreeNodes(pNode3, pNode2, NULL);
Test("Test8", pNode5, NULL);
Test("Test9", pNode4, pNode5);
Test("Test10", pNode3, pNode4);
Test("Test11", pNode2, pNode3);
DestroyTree(pNode5);
}
// 2
// 3
// 4
// 5
void Test12_15()
{
BinaryTreeNode* pNode2 = CreateBinaryTreeNode(2);
BinaryTreeNode* pNode3 = CreateBinaryTreeNode(3);
BinaryTreeNode* pNode4 = CreateBinaryTreeNode(4);
BinaryTreeNode* pNode5 = CreateBinaryTreeNode(5);
ConnectTreeNodes(pNode2, NULL, pNode3);
ConnectTreeNodes(pNode3, NULL, pNode4);
ConnectTreeNodes(pNode4, NULL, pNode5);
Test("Test12", pNode5, NULL);
Test("Test13", pNode4, pNode5);
Test("Test14", pNode3, pNode4);
Test("Test15", pNode2, pNode3);
DestroyTree(pNode2);
}
void Test16()
{
BinaryTreeNode* pNode5 = CreateBinaryTreeNode(5);
Test("Test16", pNode5, NULL);
DestroyTree(pNode5);
}
int main(int argc, char* argv[])
{
Test1_7();
Test8_11();
Test12_15();
Test16();
}