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剑指Offer第3章高质量代码

第3章高质量代码

3中错误处理的方法

面试题11: 数值的整数次方

bool g_InvalidInput = false;
bool equal(double num1, double num2);
double PowerWithUnsignedExponent(double base, unsigned int exponent);
 
double Power(double base, int exponent)
{
    g_InvalidInput = false;
 
    if(equal(base, 0.0) && exponent < 0)
    {
        g_InvalidInput = true;
        return 0.0;
    }
 
    unsigned int absExponent = (unsigned int)(exponent);
    if(exponent < 0)
        absExponent = (unsigned int)(-exponent);
 
    double result = PowerWithUnsignedExponent(base, absExponent);
    if(exponent < 0)
        result = 1.0 / result;
 
    return result;
}
 
/*
double PowerWithUnsignedExponent(double base, unsigned int exponent)
{
    double result = 1.0;
    /
    for(int i = 1; i <= exponent; ++i)
        result *= base;
 
    return result;
}
*/
double PowerWithUnsignedExponent(double base, unsigned int exponent)
{
    if(exponent == 0)
        return 1;
    if(exponent == 1)
        return base;

    double result = PowerWithUnsignedExponent(base, exponent >> 1);
    result *= result;
    if((exponent & 0x1) == 1)
        result *= base;

    return result;
}

bool equal(double num1, double num2)
{
    if((num1 - num2 > -0.0000001)
        && (num1 - num2 < 0.0000001))
        return true;
    else
        return false;
}

// ====================测试代码====================
void Test(double base, int exponent, double expectedResult, bool expectedFlag)
{
    double result = Power(base, exponent);
    if(abs(result - expectedResult) < 0.00000001 
        && g_InvalidInput == expectedFlag)
        printf("Test passed.\n");
    else
        printf("Test failed.\n");
}

int main(int argc, char* argv[])
{
    // 底数、指数都为正数
    printf("Test1 begins.\n");
    Test(2, 3, 8, false);

    // 底数为负数、指数为正数
    printf("Test2 begins.\n");
    Test(-2, 3, -8, false);

    // 指数为负数
    printf("Test3 begins.\n");
    Test(2, -3, 0.125, false);

    // 指数为0
    printf("Test4 begins.\n");
    Test(2, 0, 1, false);

    // 底数、指数都为0
    printf("Test5 begins.\n");
    Test(0, 0, 1, false);

    // 底数为0、指数为正数
    printf("Test6 begins.\n");
    Test(0, 4, 0, false);

    // 底数为0、指数为负数
    printf("Test7 begins.\n");
    Test(0, -4, 0, true);

    return 0;
}

面试题12: 打印1到最大的n位数

void PrintNumber(char*number);
bool Increment(char* number);
void Print1ToMaxOfNDigits_1(int n){
    if(n<=0)
        return ;
    char* number=new char[n+1];
    memset(number,'0',sizeof(char)*(n+1));
    number[n]='\0';
    while(!Increment(number)){
        PrintNumber(number);
    }
    delete[] number;
}
void PrintNumber(char* number){
    char* p=number;
    while(*p=='0')
        p++;
    printf("%s\n",p);
}
bool Increment(char* number){
    int len=strlen(number);
    int carry=0,r;
    int t;
    for(int i=len-1;i>=0;i--){
        t=number[i]-'0'+carry;
        if(i==len-1)
            t++;
        if(i==0&&t>9)
            return  true;
        r=t%10;
        carry=t/10;
        number[i]='0'+r;
    }
    return false;
}
// ====================方法二====================
void Print1ToMaxOfNDigitsRecursively(char* number, int length, int index) {
    if(index==length-1){
        PrintNumber(number);
    }
    else{
        for(int i=0;i<10;i++){
            number[index+1]=i+'0';
        Print1ToMaxOfNDigitsRecursively(number,length,index+1);
        }
    }

}
 
void Print1ToMaxOfNDigits_2(int n){
    if(n<=0)
        return ;
    char* number=new char[n+1];
    memset(number,'0',sizeof(char)*(n+1));
    number[n]='\0';
    for(int i=0;i<10;i++){
        number[0]=i+'0';
        Print1ToMaxOfNDigitsRecursively(number,n,0);
    }

}
// ====================测试代码====================
void Test(int n)
{
    printf("Test for %d begins:\n", n);

    Print1ToMaxOfNDigits_1(n);
    Print1ToMaxOfNDigits_2(n);

    printf("Test for %d ends.\n", n);
}

int main(int argc, char* argv[])
{
    Test(1);
    Test(2);
    Test(3);
    Test(4);
    Test(0);
    Test(-1);

    return 0;
}

这个面试题其实很简单的,就是利用快排中交换的思想. 这儿想要说明一个函数指针的使用问题.

代码如下:

void Reorder(int *pData, unsigned int length, bool (*func)(int));
bool isEven(int n);

// ====================方法一====================
void ReorderOddEven_1(int *pData, unsigned int length)
{
    if(pData == NULL || length == 0)
        return;

    int *pBegin = pData;
    int *pEnd = pData + length - 1;

    while(pBegin < pEnd)
    {
        // 向后移动pBegin，直到它指向偶数
        while(pBegin < pEnd && (*pBegin & 0x1) != 0)
            pBegin ++;

        // 向前移动pEnd，直到它指向奇数
        while(pBegin < pEnd && (*pEnd & 0x1) == 0)
            pEnd --;

        if(pBegin < pEnd)
        {
            int temp = *pBegin;
            *pBegin = *pEnd;
            *pEnd = temp;
        }
    }
}

// ====================方法二====================
void ReorderOddEven_2(int *pData, unsigned int length)
{
    Reorder(pData, length, isEven);
}

void Reorder(int *pData, unsigned int length, bool (*func)(int))
{
    if(pData == NULL || length == 0)
        return;

    int *pBegin = pData;
    int *pEnd = pData + length - 1;

    while(pBegin < pEnd) 
    {
        // 向后移动pBegin
        while(pBegin < pEnd && !func(*pBegin))
            pBegin ++;

        // 向前移动pEnd
        while(pBegin < pEnd && func(*pEnd))
            pEnd --;

        if(pBegin < pEnd)
        {
            int temp = *pBegin;
            *pBegin = *pEnd;
            *pEnd = temp;
        }
    }
}

bool isEven(int n)
{
    return (n & 1) == 0;
}

// ====================测试代码====================
void PrintArray(int numbers[], int length)
{
    if(length < 0)
        return;

    for(int i = 0; i < length; ++i)
        printf("%d\t", numbers[i]);

    printf("\n");
}

void Test(char* testName, int numbers[], int length)
{
    if(testName != NULL)
        printf("%s begins:\n", testName);

    int* copy = new int[length];
    for(int i = 0; i < length; ++i)
    {
        copy[i] = numbers[i];
    }

    printf("Test for solution 1:\n");
    PrintArray(numbers, length);
    ReorderOddEven_1(numbers, length);
    PrintArray(numbers, length);

    printf("Test for solution 2:\n");
    PrintArray(copy, length);
    ReorderOddEven_2(copy, length);
    PrintArray(copy, length);

    delete[] copy;
}

void Test1()
{
    int numbers[] = {1, 2, 3, 4, 5, 6, 7};
    Test("Test1", numbers, sizeof(numbers)/sizeof(int));
}

void Test2()
{
    int numbers[] = {2, 4, 6, 1, 3, 5, 7};
    Test("Test2", numbers, sizeof(numbers)/sizeof(int));
}

void Test3()
{
    int numbers[] = {1, 3, 5, 7, 2, 4, 6};
    Test("Test3", numbers, sizeof(numbers)/sizeof(int));
}

void Test4()
{
    int numbers[] = {1};
    Test("Test4", numbers, sizeof(numbers)/sizeof(int));
}

void Test5()
{
    int numbers[] = {2};
    Test("Test5", numbers, sizeof(numbers)/sizeof(int));
}

void Test6()
{
    Test("Test6", NULL, 0);
}

int main(int argc, char* argv[])
{
    Test1();
    Test2();
    Test3();
    Test4();
    Test5();
    Test6();

    return 0;
}

代码如下:

ListNode* FindKthToTail(ListNode* pListHead, unsigned int k){
    if(pListHead==0||k==0)
        return 0;
    ListNode* p=pListHead;
    for(int i=1;i<k;i++){
        p=p->m_pNext;
        if(p==0)
            return 0;
    }
    ListNode* q=pListHead;
    while(p->m_pNext!=0){
        p=p->m_pNext;
        q=q->m_pNext;
    }
    return q;
}
// ====================测试代码====================
// 测试要找的结点在链表中间
void Test1()
{
    printf("=====Test1 starts:=====\n");
    ListNode* pNode1 = CreateListNode(1);
    ListNode* pNode2 = CreateListNode(2);
    ListNode* pNode3 = CreateListNode(3);
    ListNode* pNode4 = CreateListNode(4);
    ListNode* pNode5 = CreateListNode(5);

    ConnectListNodes(pNode1, pNode2);
    ConnectListNodes(pNode2, pNode3);
    ConnectListNodes(pNode3, pNode4);
    ConnectListNodes(pNode4, pNode5);

    printf("expected result: 4.\n");
    ListNode* pNode = FindKthToTail(pNode1, 2);
    PrintListNode(pNode);

    DestroyList(pNode1);
}

// 测试要找的结点是链表的尾结点
void Test2()
{
    printf("=====Test2 starts:=====\n");
    ListNode* pNode1 = CreateListNode(1);
    ListNode* pNode2 = CreateListNode(2);
    ListNode* pNode3 = CreateListNode(3);
    ListNode* pNode4 = CreateListNode(4);
    ListNode* pNode5 = CreateListNode(5);

    ConnectListNodes(pNode1, pNode2);
    ConnectListNodes(pNode2, pNode3);
    ConnectListNodes(pNode3, pNode4);
    ConnectListNodes(pNode4, pNode5);

    printf("expected result: 5.\n");
    ListNode* pNode = FindKthToTail(pNode1, 1);
    PrintListNode(pNode);

    DestroyList(pNode1);
}

// 测试要找的结点是链表的头结点
void Test3()
{
    printf("=====Test3 starts:=====\n");
    ListNode* pNode1 = CreateListNode(1);
    ListNode* pNode2 = CreateListNode(2);
    ListNode* pNode3 = CreateListNode(3);
    ListNode* pNode4 = CreateListNode(4);
    ListNode* pNode5 = CreateListNode(5);

    ConnectListNodes(pNode1, pNode2);
    ConnectListNodes(pNode2, pNode3);
    ConnectListNodes(pNode3, pNode4);
    ConnectListNodes(pNode4, pNode5);

    printf("expected result: 1.\n");
    ListNode* pNode = FindKthToTail(pNode1, 5);
    PrintListNode(pNode);

    DestroyList(pNode1);
}

// 测试空链表
void Test4()
{
    printf("=====Test4 starts:=====\n");
    printf("expected result: NULL.\n");
    ListNode* pNode = FindKthToTail(NULL, 100);
    PrintListNode(pNode);
}

// 测试输入的第二个参数大于链表的结点总数
void Test5()
{
    printf("=====Test5 starts:=====\n");
    ListNode* pNode1 = CreateListNode(1);
    ListNode* pNode2 = CreateListNode(2);
    ListNode* pNode3 = CreateListNode(3);
    ListNode* pNode4 = CreateListNode(4);
    ListNode* pNode5 = CreateListNode(5);

    ConnectListNodes(pNode1, pNode2);
    ConnectListNodes(pNode2, pNode3);
    ConnectListNodes(pNode3, pNode4);
    ConnectListNodes(pNode4, pNode5);

    printf("expected result: NULL.\n");
    ListNode* pNode = FindKthToTail(pNode1, 6);
    PrintListNode(pNode);

    DestroyList(pNode1);
}

// 测试输入的第二个参数为0
void Test6()
{
    printf("=====Test6 starts:=====\n");
    ListNode* pNode1 = CreateListNode(1);
    ListNode* pNode2 = CreateListNode(2);
    ListNode* pNode3 = CreateListNode(3);
    ListNode* pNode4 = CreateListNode(4);
    ListNode* pNode5 = CreateListNode(5);

    ConnectListNodes(pNode1, pNode2);
    ConnectListNodes(pNode2, pNode3);
    ConnectListNodes(pNode3, pNode4);
    ConnectListNodes(pNode4, pNode5);

    printf("expected result: NULL.\n");
    ListNode* pNode = FindKthToTail(pNode1, 0);
    PrintListNode(pNode);

    DestroyList(pNode1);
}

int main(int argc, char* argv[])
{
    Test1();
    Test2();
    Test3();
    Test4();
    Test5();
    Test6();

    return 0;
}

代码如下:

ListNode* ReverseList(ListNode* pHead){
    if(pHead==0)
        return 0;
    ListNode* p=pHead,*pp=0,*q=0;
    while(p!=0){
        q=p->m_pNext;
        p->m_pNext=pp;
        pp=p;
        p=q;
    }
    return pp;
}
// ====================测试代码====================
ListNode* Test(ListNode* pHead)
{
    printf("The original list is: \n");
    PrintList(pHead);

    ListNode* pReversedHead = ReverseList(pHead);

    printf("The reversed list is: \n");
    PrintList(pReversedHead);

    return pReversedHead;
}

// 输入的链表有多个结点
void Test1()
{
    ListNode* pNode1 = CreateListNode(1);
    ListNode* pNode2 = CreateListNode(2);
    ListNode* pNode3 = CreateListNode(3);
    ListNode* pNode4 = CreateListNode(4);
    ListNode* pNode5 = CreateListNode(5);

    ConnectListNodes(pNode1, pNode2);
    ConnectListNodes(pNode2, pNode3);
    ConnectListNodes(pNode3, pNode4);
    ConnectListNodes(pNode4, pNode5);

    ListNode* pReversedHead = Test(pNode1);

    DestroyList(pReversedHead);
}

// 输入的链表只有一个结点
void Test2()
{
    ListNode* pNode1 = CreateListNode(1);

    ListNode* pReversedHead = Test(pNode1);

    DestroyList(pReversedHead);
}

// 输入空链表
void Test3()
{
    Test(NULL);
}

int main(int argc, char* argv[])
{
    Test1();
    Test2();
    Test3();

    return 0;
}

代码如下:

ListNode* Merge(ListNode* pHead1, ListNode* pHead2){
    if(pHead1==0)
        return pHead2;
    if(pHead2==0)
        return pHead1;
    ListNode* pMerge;
    if(pHead1->m_nValue<pHead2->m_nValue){
        pMerge=pHead1;
        pMerge->m_pNext=Merge(pHead1->m_pNext,pHead2);
    }
    else{
        pMerge=pHead2;
        pMerge->m_pNext=Merge(pHead1,pHead2->m_pNext);
    }
    return pMerge;
}
// ====================测试代码====================
ListNode* Test(char* testName, ListNode* pHead1, ListNode* pHead2)
{
    if(testName != NULL)
        printf("%s begins:\n", testName);

    printf("The first list is:\n");
    PrintList(pHead1);

    printf("The second list is:\n");
    PrintList(pHead2);

    printf("The merged list is:\n");
    ListNode* pMergedHead = Merge(pHead1, pHead2);
    PrintList(pMergedHead);
    
    printf("\n\n");

    return pMergedHead;
}

// list1: 1->3->5
// list2: 2->4->6
void Test1()
{
    ListNode* pNode1 = CreateListNode(1);
    ListNode* pNode3 = CreateListNode(3);
    ListNode* pNode5 = CreateListNode(5);

    ConnectListNodes(pNode1, pNode3);
    ConnectListNodes(pNode3, pNode5);

    ListNode* pNode2 = CreateListNode(2);
    ListNode* pNode4 = CreateListNode(4);
    ListNode* pNode6 = CreateListNode(6);

    ConnectListNodes(pNode2, pNode4);
    ConnectListNodes(pNode4, pNode6);

    ListNode* pMergedHead = Test("Test1", pNode1, pNode2);

    DestroyList(pMergedHead);
}

// 两个链表中有重复的数字
// list1: 1->3->5
// list2: 1->3->5
void Test2()
{
    ListNode* pNode1 = CreateListNode(1);
    ListNode* pNode3 = CreateListNode(3);
    ListNode* pNode5 = CreateListNode(5);

    ConnectListNodes(pNode1, pNode3);
    ConnectListNodes(pNode3, pNode5);

    ListNode* pNode2 = CreateListNode(1);
    ListNode* pNode4 = CreateListNode(3);
    ListNode* pNode6 = CreateListNode(5);

    ConnectListNodes(pNode2, pNode4);
    ConnectListNodes(pNode4, pNode6);

    ListNode* pMergedHead = Test("Test2", pNode1, pNode2);

    DestroyList(pMergedHead);
}

// 两个链表都只有一个数字
// list1: 1
// list2: 2
void Test3()
{
    ListNode* pNode1 = CreateListNode(1);
    ListNode* pNode2 = CreateListNode(2);

    ListNode* pMergedHead = Test("Test3", pNode1, pNode2);

    DestroyList(pMergedHead);
}

// 一个链表为空链表
// list1: 1->3->5
// list2: 空链表
void Test4()
{
    ListNode* pNode1 = CreateListNode(1);
    ListNode* pNode3 = CreateListNode(3);
    ListNode* pNode5 = CreateListNode(5);

    ConnectListNodes(pNode1, pNode3);
    ConnectListNodes(pNode3, pNode5);

    ListNode* pMergedHead = Test("Test4", pNode1, NULL);

    DestroyList(pMergedHead);
}

// 两个链表都为空链表
// list1: 空链表
// list2: 空链表
void Test5()
{
    ListNode* pMergedHead = Test("Test5", NULL, NULL);
}

int main(int argc, char* argv[])
{
    Test1();
    Test2();
    Test3();
    Test4();
    Test5();

    return 0;
}

代码如下:

bool DoesTree1HaveTree2(BinaryTreeNode* pRoot1, BinaryTreeNode* pRoot2);

bool HasSubtree(BinaryTreeNode* pRoot1, BinaryTreeNode* pRoot2){
    bool flag=false;
    if(pRoot1!=0&&pRoot2!=0){
        flag=DoesTree1HaveTree2(pRoot1,pRoot2);
        if(!flag)
            flag=HasSubtree(pRoot1->m_pLeft,pRoot2)||HasSubtree(pRoot1->m_pRight,pRoot2);
    }
    return flag;
}
bool DoesTree1HaveTree2(BinaryTreeNode* pRoot1, BinaryTreeNode* pRoot2){
    if(pRoot2==0)
        return true;
    if(pRoot1==0)
        return false;
    if(pRoot1->m_nValue!=pRoot2->m_nValue)
        return false;
    return DoesTree1HaveTree2(pRoot1->m_pLeft,pRoot2->m_pLeft)&&
        DoesTree1HaveTree2(pRoot1->m_pRight,pRoot2->m_pRight);
}
// ====================测试代码====================
void Test(char* testName, BinaryTreeNode* pRoot1, BinaryTreeNode* pRoot2, bool expected)
{
    if(HasSubtree(pRoot1, pRoot2) == expected)
        printf("%s passed.\n", testName);
    else
        printf("%s failed.\n", testName);
}

// 树中结点含有分叉，树B是树A的子结构
//                  8                8
//              /       \           / \
//             8         7         9   2
//           /   \
//          9     2
//               / \
//              4   7
void Test1()
{
    BinaryTreeNode* pNodeA1 = CreateBinaryTreeNode(8);
    BinaryTreeNode* pNodeA2 = CreateBinaryTreeNode(8);
    BinaryTreeNode* pNodeA3 = CreateBinaryTreeNode(7);
    BinaryTreeNode* pNodeA4 = CreateBinaryTreeNode(9);
    BinaryTreeNode* pNodeA5 = CreateBinaryTreeNode(2);
    BinaryTreeNode* pNodeA6 = CreateBinaryTreeNode(4);
    BinaryTreeNode* pNodeA7 = CreateBinaryTreeNode(7);

    ConnectTreeNodes(pNodeA1, pNodeA2, pNodeA3);
    ConnectTreeNodes(pNodeA2, pNodeA4, pNodeA5);
    ConnectTreeNodes(pNodeA5, pNodeA6, pNodeA7);

    BinaryTreeNode* pNodeB1 = CreateBinaryTreeNode(8);
    BinaryTreeNode* pNodeB2 = CreateBinaryTreeNode(9);
    BinaryTreeNode* pNodeB3 = CreateBinaryTreeNode(2);

    ConnectTreeNodes(pNodeB1, pNodeB2, pNodeB3);

    Test("Test1", pNodeA1, pNodeB1, true);

    DestroyTree(pNodeA1);
    DestroyTree(pNodeB1);
}

// 树中结点含有分叉，树B不是树A的子结构
//                  8                8
//              /       \           / \
//             8         7         9   2
//           /   \
//          9     3
//               / \
//              4   7
void Test2()
{
    BinaryTreeNode* pNodeA1 = CreateBinaryTreeNode(8);
    BinaryTreeNode* pNodeA2 = CreateBinaryTreeNode(8);
    BinaryTreeNode* pNodeA3 = CreateBinaryTreeNode(7);
    BinaryTreeNode* pNodeA4 = CreateBinaryTreeNode(9);
    BinaryTreeNode* pNodeA5 = CreateBinaryTreeNode(3);
    BinaryTreeNode* pNodeA6 = CreateBinaryTreeNode(4);
    BinaryTreeNode* pNodeA7 = CreateBinaryTreeNode(7);

    ConnectTreeNodes(pNodeA1, pNodeA2, pNodeA3);
    ConnectTreeNodes(pNodeA2, pNodeA4, pNodeA5);
    ConnectTreeNodes(pNodeA5, pNodeA6, pNodeA7);

    BinaryTreeNode* pNodeB1 = CreateBinaryTreeNode(8);
    BinaryTreeNode* pNodeB2 = CreateBinaryTreeNode(9);
    BinaryTreeNode* pNodeB3 = CreateBinaryTreeNode(2);

    ConnectTreeNodes(pNodeB1, pNodeB2, pNodeB3);

    Test("Test2", pNodeA1, pNodeB1, false);

    DestroyTree(pNodeA1);
    DestroyTree(pNodeB1);
}

// 树中结点只有左子结点，树B是树A的子结构
//                8                  8
//              /                   / 
//             8                   9   
//           /                    /
//          9                    2
//         /      
//        2        
//       /
//      5
void Test3()
{
    BinaryTreeNode* pNodeA1 = CreateBinaryTreeNode(8);
    BinaryTreeNode* pNodeA2 = CreateBinaryTreeNode(8);
    BinaryTreeNode* pNodeA3 = CreateBinaryTreeNode(9);
    BinaryTreeNode* pNodeA4 = CreateBinaryTreeNode(2);
    BinaryTreeNode* pNodeA5 = CreateBinaryTreeNode(5);

    ConnectTreeNodes(pNodeA1, pNodeA2, NULL);
    ConnectTreeNodes(pNodeA2, pNodeA3, NULL);
    ConnectTreeNodes(pNodeA3, pNodeA4, NULL);
    ConnectTreeNodes(pNodeA4, pNodeA5, NULL);

    BinaryTreeNode* pNodeB1 = CreateBinaryTreeNode(8);
    BinaryTreeNode* pNodeB2 = CreateBinaryTreeNode(9);
    BinaryTreeNode* pNodeB3 = CreateBinaryTreeNode(2);

    ConnectTreeNodes(pNodeB1, pNodeB2, NULL);
    ConnectTreeNodes(pNodeB2, pNodeB3, NULL);

    Test("Test3", pNodeA1, pNodeB1, true);

    DestroyTree(pNodeA1);
    DestroyTree(pNodeB1);
}

// 树中结点只有左子结点，树B不是树A的子结构
//                8                  8
//              /                   / 
//             8                   9   
//           /                    /
//          9                    3
//         /      
//        2        
//       /
//      5
void Test4()
{
    BinaryTreeNode* pNodeA1 = CreateBinaryTreeNode(8);
    BinaryTreeNode* pNodeA2 = CreateBinaryTreeNode(8);
    BinaryTreeNode* pNodeA3 = CreateBinaryTreeNode(9);
    BinaryTreeNode* pNodeA4 = CreateBinaryTreeNode(2);
    BinaryTreeNode* pNodeA5 = CreateBinaryTreeNode(5);

    ConnectTreeNodes(pNodeA1, pNodeA2, NULL);
    ConnectTreeNodes(pNodeA2, pNodeA3, NULL);
    ConnectTreeNodes(pNodeA3, pNodeA4, NULL);
    ConnectTreeNodes(pNodeA4, pNodeA5, NULL);

    BinaryTreeNode* pNodeB1 = CreateBinaryTreeNode(8);
    BinaryTreeNode* pNodeB2 = CreateBinaryTreeNode(9);
    BinaryTreeNode* pNodeB3 = CreateBinaryTreeNode(3);

    ConnectTreeNodes(pNodeB1, pNodeB2, NULL);
    ConnectTreeNodes(pNodeB2, pNodeB3, NULL);

    Test("Test4", pNodeA1, pNodeB1, false);

    DestroyTree(pNodeA1);
    DestroyTree(pNodeB1);
}

// 树中结点只有右子结点，树B是树A的子结构
//       8                   8
//        \                   \ 
//         8                   9   
//          \                   \
//           9                   2
//            \      
//             2        
//              \
//               5
void Test5()
{
    BinaryTreeNode* pNodeA1 = CreateBinaryTreeNode(8);
    BinaryTreeNode* pNodeA2 = CreateBinaryTreeNode(8);
    BinaryTreeNode* pNodeA3 = CreateBinaryTreeNode(9);
    BinaryTreeNode* pNodeA4 = CreateBinaryTreeNode(2);
    BinaryTreeNode* pNodeA5 = CreateBinaryTreeNode(5);

    ConnectTreeNodes(pNodeA1, NULL, pNodeA2);
    ConnectTreeNodes(pNodeA2, NULL, pNodeA3);
    ConnectTreeNodes(pNodeA3, NULL, pNodeA4);
    ConnectTreeNodes(pNodeA4, NULL, pNodeA5);

    BinaryTreeNode* pNodeB1 = CreateBinaryTreeNode(8);
    BinaryTreeNode* pNodeB2 = CreateBinaryTreeNode(9);
    BinaryTreeNode* pNodeB3 = CreateBinaryTreeNode(2);

    ConnectTreeNodes(pNodeB1, NULL, pNodeB2);
    ConnectTreeNodes(pNodeB2, NULL, pNodeB3);

    Test("Test5", pNodeA1, pNodeB1, true);

    DestroyTree(pNodeA1);
    DestroyTree(pNodeB1);
}

// 树A中结点只有右子结点，树B不是树A的子结构
//       8                   8
//        \                   \ 
//         8                   9   
//          \                 / \
//           9               3   2
//            \      
//             2        
//              \
//               5
void Test6()
{
    BinaryTreeNode* pNodeA1 = CreateBinaryTreeNode(8);
    BinaryTreeNode* pNodeA2 = CreateBinaryTreeNode(8);
    BinaryTreeNode* pNodeA3 = CreateBinaryTreeNode(9);
    BinaryTreeNode* pNodeA4 = CreateBinaryTreeNode(2);
    BinaryTreeNode* pNodeA5 = CreateBinaryTreeNode(5);

    ConnectTreeNodes(pNodeA1, NULL, pNodeA2);
    ConnectTreeNodes(pNodeA2, NULL, pNodeA3);
    ConnectTreeNodes(pNodeA3, NULL, pNodeA4);
    ConnectTreeNodes(pNodeA4, NULL, pNodeA5);

    BinaryTreeNode* pNodeB1 = CreateBinaryTreeNode(8);
    BinaryTreeNode* pNodeB2 = CreateBinaryTreeNode(9);
    BinaryTreeNode* pNodeB3 = CreateBinaryTreeNode(3);
    BinaryTreeNode* pNodeB4 = CreateBinaryTreeNode(2);

    ConnectTreeNodes(pNodeB1, NULL, pNodeB2);
    ConnectTreeNodes(pNodeB2, pNodeB3, pNodeB4);

    Test("Test6", pNodeA1, pNodeB1, false);

    DestroyTree(pNodeA1);
    DestroyTree(pNodeB1);
}

// 树A为空树
void Test7()
{
    BinaryTreeNode* pNodeB1 = CreateBinaryTreeNode(8);
    BinaryTreeNode* pNodeB2 = CreateBinaryTreeNode(9);
    BinaryTreeNode* pNodeB3 = CreateBinaryTreeNode(3);
    BinaryTreeNode* pNodeB4 = CreateBinaryTreeNode(2);

    ConnectTreeNodes(pNodeB1, NULL, pNodeB2);
    ConnectTreeNodes(pNodeB2, pNodeB3, pNodeB4);

    Test("Test7", NULL, pNodeB1, false);

    DestroyTree(pNodeB1);
}

// 树B为空树
void Test8()
{
    BinaryTreeNode* pNodeA1 = CreateBinaryTreeNode(8);
    BinaryTreeNode* pNodeA2 = CreateBinaryTreeNode(9);
    BinaryTreeNode* pNodeA3 = CreateBinaryTreeNode(3);
    BinaryTreeNode* pNodeA4 = CreateBinaryTreeNode(2);

    ConnectTreeNodes(pNodeA1, NULL, pNodeA2);
    ConnectTreeNodes(pNodeA2, pNodeA3, pNodeA4);

    Test("Test8", pNodeA1, NULL, false);

    DestroyTree(pNodeA1);
}

// 树A和树B都为空
void Test9()
{
    Test("Test9", NULL, NULL, false);
}

int main(int argc, char* argv[])
{
    Test1();
    Test2();
    Test3();
    Test4();
    Test5();
    Test6();
    Test7();
    Test8();
    Test9();

    return 0;
}

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原文地址：https://www.cnblogs.com/xkfz007/p/2758129.html

剑指Offer第3章 高质量代码

剑指Offer第3章高质量代码