《剑指offer》第三十二题(分行从上到下打印二叉树)
2024-10-19 09:47:00
// 面试题32(二):分行从上到下打印二叉树
// 题目:从上到下按层打印二叉树,同一层的结点按从左到右的顺序打印,每一层
// 打印到一行。 #include <cstdio>
#include "BinaryTree.h"
#include <queue> void Print(BinaryTreeNode* pRoot)
{
if (pRoot == nullptr)
return; std::queue<BinaryTreeNode*> nodes;
nodes.push(pRoot);
int nextLevel = ;//相比上个题,多了两个变量,一个是下层结点个数,初始化为0
int toBePrinted = ;//一个是待打印的点,初始化为1
while (!nodes.empty())
{
BinaryTreeNode* pNode = nodes.front();
printf("%d ", pNode->m_nValue); if (pNode->m_pLeft != nullptr)
{
nodes.push(pNode->m_pLeft);
++nextLevel;//每有一个孩子进入队列,下层结点加1
}
if (pNode->m_pRight != nullptr)
{
nodes.push(pNode->m_pRight);
++nextLevel;
} nodes.pop();
--toBePrinted;//每弹出一个节点,待打印节点就减1
if (toBePrinted == )//直到当前层打印完
{
printf("\n");//换行
toBePrinted = nextLevel;//把记住的下层结点总数给它
nextLevel = ;//下层结点要打印的个数置零,从新计数
}
}
} // ====================测试代码====================
// 8
// 6 10
// 5 7 9 11
void Test1()
{
BinaryTreeNode* pNode8 = CreateBinaryTreeNode();
BinaryTreeNode* pNode6 = CreateBinaryTreeNode();
BinaryTreeNode* pNode10 = CreateBinaryTreeNode();
BinaryTreeNode* pNode5 = CreateBinaryTreeNode();
BinaryTreeNode* pNode7 = CreateBinaryTreeNode();
BinaryTreeNode* pNode9 = CreateBinaryTreeNode();
BinaryTreeNode* pNode11 = CreateBinaryTreeNode(); ConnectTreeNodes(pNode8, pNode6, pNode10);
ConnectTreeNodes(pNode6, pNode5, pNode7);
ConnectTreeNodes(pNode10, pNode9, pNode11); printf("====Test1 Begins: ====\n");
printf("Expected Result is:\n");
printf("8 \n");
printf("6 10 \n");
printf("5 7 9 11 \n\n"); printf("Actual Result is: \n");
Print(pNode8);
printf("\n"); DestroyTree(pNode8);
} // 5
// 4
// 3
//
void Test2()
{
BinaryTreeNode* pNode5 = CreateBinaryTreeNode();
BinaryTreeNode* pNode4 = CreateBinaryTreeNode();
BinaryTreeNode* pNode3 = CreateBinaryTreeNode();
BinaryTreeNode* pNode2 = CreateBinaryTreeNode(); ConnectTreeNodes(pNode5, pNode4, nullptr);
ConnectTreeNodes(pNode4, pNode3, nullptr);
ConnectTreeNodes(pNode3, pNode2, nullptr); printf("====Test2 Begins: ====\n");
printf("Expected Result is:\n");
printf("5 \n");
printf("4 \n");
printf("3 \n");
printf("2 \n\n"); printf("Actual Result is: \n");
Print(pNode5);
printf("\n"); DestroyTree(pNode5);
} // 5
// 4
// 3
// 2
void Test3()
{
BinaryTreeNode* pNode5 = CreateBinaryTreeNode();
BinaryTreeNode* pNode4 = CreateBinaryTreeNode();
BinaryTreeNode* pNode3 = CreateBinaryTreeNode();
BinaryTreeNode* pNode2 = CreateBinaryTreeNode(); ConnectTreeNodes(pNode5, nullptr, pNode4);
ConnectTreeNodes(pNode4, nullptr, pNode3);
ConnectTreeNodes(pNode3, nullptr, pNode2); printf("====Test3 Begins: ====\n");
printf("Expected Result is:\n");
printf("5 \n");
printf("4 \n");
printf("3 \n");
printf("2 \n\n"); printf("Actual Result is: \n");
Print(pNode5);
printf("\n"); DestroyTree(pNode5);
} void Test4()
{
BinaryTreeNode* pNode5 = CreateBinaryTreeNode(); printf("====Test4 Begins: ====\n");
printf("Expected Result is:\n");
printf("5 \n\n"); printf("Actual Result is: \n");
Print(pNode5);
printf("\n"); DestroyTree(pNode5);
} void Test5()
{
printf("====Test5 Begins: ====\n");
printf("Expected Result is:\n"); printf("Actual Result is: \n");
Print(nullptr);
printf("\n");
} // 100
// /
// 50
// \
//
void Test6()
{
BinaryTreeNode* pNode100 = CreateBinaryTreeNode();
BinaryTreeNode* pNode50 = CreateBinaryTreeNode();
BinaryTreeNode* pNode150 = CreateBinaryTreeNode(); ConnectTreeNodes(pNode100, pNode50, nullptr);
ConnectTreeNodes(pNode50, nullptr, pNode150); printf("====Test6 Begins: ====\n");
printf("Expected Result is:\n");
printf("100 \n");
printf("50 \n");
printf("150 \n\n"); printf("Actual Result is: \n");
Print(pNode100);
printf("\n");
} int main(int argc, char* argv[])
{
Test1();
Test2();
Test3();
Test4();
Test5();
Test6();
system("pause");
return ;
}
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