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C++ 显示分段故障的红黑树插入代码11_C++_C_Data Structures_Tree_Red Black Tree Insertion - Fatal编程技术网

C++ 显示分段故障的红黑树插入代码11

C++ 显示分段故障的红黑树插入代码11,c++,c,data-structures,tree,red-black-tree-insertion,C++,C,Data Structures,Tree,Red Black Tree Insertion,当我输入数字时,显示分段故障11。 请帮忙。 我已经被困在这两个小时了。 我试过很多东西,但都没能通过。 请帮忙。 可能rbInsert或旋转函数有问题,但我找不到。非常感谢您的帮助 #include <iostream> #include <cstdlib> using namespace std; // enum nodeColor // { // red, // black // }; struct rbNode { int data; c

当我输入数字时,显示分段故障11。 请帮忙。 我已经被困在这两个小时了。 我试过很多东西,但都没能通过。 请帮忙。 可能rbInsert或旋转函数有问题,但我找不到。非常感谢您的帮助

#include <iostream>
#include <cstdlib>

using namespace std;

// enum nodeColor
// {
//  red,
//  black
// };

struct rbNode
{
    int data;
    char color;
    struct rbNode *left,*right,*parent;
};

struct rbNode *root=NULL;

struct rbNode *newNode(int data)
{
    struct rbNode *newnode=(struct rbNode*)malloc(sizeof(struct rbNode));
    newnode->data=data;
    newnode->color='r';
    newnode->left=newnode->right=newnode->parent=NULL;
    return newnode;
}

void swapColor(struct rbNode *a,struct rbNode *b)
{
    struct rbNode *temp=a;
    a=b;
    b=temp;
}


void leftRotate(struct rbNode *root,struct rbNode* x)
{
    struct rbNode *y;
    y=x->right;
    x->right=y->left;
    if(y->left!=NULL)
    {
        y->left->parent=x;
    }
    y->parent=x->parent;

    if(x->parent==NULL)
    {
        y=root;
    }
    if(x->parent->left->data==x->data)y=x->parent->left;
    else y=x->parent->right;
    y->left=x;
    x->parent=y;
}

void rightRotate(struct rbNode *root,struct rbNode* x)
{
    struct rbNode *y;
    y = x->left; 
    x->left = y->right; 
    if ( y->right != NULL){
        y->right->parent = x;
    }
    y->parent = x->parent;
    if( x->parent == NULL){
        root = y;
    } 
    else if( x->data == x->parent->left->data){
        x->parent->left = y;
    }
    else x->parent->right = y;
    y->right = x; 
    x->parent = y; 

    return;

}

void rbInsertFix(struct rbNode *root,struct rbNode *newnode)
{
    struct rbNode *uncle;
    while(newnode->parent->color=='r')
    {
        if(newnode->parent->data==newnode->parent->parent->left->data) 
        {
            uncle=newnode->parent->parent->right;
            if(uncle->color=='r')
            {
                newnode->parent->color='b';
                uncle->color='b';
                newnode=newnode->parent->parent;
            }
            else if(uncle->color=='b')
            {

                if(newnode->parent->left->data==newnode->data)
                {
                    rightRotate(root,newnode->parent->parent);
                    swapColor(newnode->parent->parent,newnode->parent);
                }   

                else if(newnode->parent->right->data==newnode->data)
                {
                    leftRotate(root,newnode->parent);
                    rightRotate(root,newnode->parent->parent);
                    swapColor(newnode->parent->parent,newnode->parent);
                }

            }
        }   

        else 

        {   
            uncle=newnode->parent->parent->left;
            if(uncle->color=='r')
            {
                newnode->parent->color='b';
                uncle->color='b';
                newnode=newnode->parent->parent;
            }
            else if(uncle->color=='b')
            {

                if(newnode->parent->left->data==newnode->data)
                {
                    rightRotate(root,newnode->parent->parent);
                    leftRotate(root,newnode->parent->parent);
                    swapColor(newnode->parent->parent,newnode->parent);
                }   

                else if(newnode->parent->right->data==newnode->data)
                {
                    leftRotate(root,newnode->parent);
                    swapColor(newnode->parent->parent,newnode->parent);
                }

            }

        }

    }
root->color='b';
}



void rbInsert(struct rbNode **root,int data){
struct rbNode *z = (struct rbNode*)malloc(sizeof(struct rbNode));
z->data = data;
z->left = NULL;
z->right = NULL;
z->color = 'r';
struct rbNode *x = *root;
struct rbNode *y;
if ( root == NULL ){
    *root = z;
    (*root)->color = 'b';
    return;
}
while ( x != NULL){
    y = x;
    if ( z->data < x->data){
        x = x->left;
    }
    else x = x->right;
}
z->parent = y;
if ( y == NULL){
    *root = z;
}
else if( z->data < y->data ){
    y->left = z;
}
else y->right = z;
rbInsertFix(*root,z);

//cout << "yo";
return;
}

void inOrderTraversal(struct rbNode* root)
{
    if(root==NULL)
        return;
    inOrderTraversal(root->left);
    cout << root->data << root->color;
    inOrderTraversal(root->right);
}

int main(int argc, char const *argv[])
{
    int loop = 1;
    while(loop)
    {
        printf("\nRed Black Tree Management - Enter your choice : ");
        printf("\n1\tInsert into RBT\n2\tDisplay RBT inorder\n");
        int choice;
        int data;
        scanf("%d",&choice);
        switch(choice){
            case 1:
            printf("\nEnter the integer you want to add : ");
            scanf("%d",&data);
            rbInsert(&root,data);
            break;

            case 2:
            printf("\nInorder tree traversal left-root-right\n");
            inOrderTraversal(root);
            break;

            default:
            printf("\nInvalid Choice\n");
        }
        printf("\nPress '0' to terminate and '1' to continue : ");
        scanf("%d",&loop);
    }       
    return 0;
}

在运行这个程序时,我遇到了一个主要的第一个问题。当从接口添加新节点时,我立即得到一个segfault,因为这行代码:

L85 while(newnode->parent->color=='r')
我将开始修复这个空解引用问题,然后从那里开始使用gdb。这是一个非常有用的工具。只需使用调试信息编译,使用-g标志并运行gdb[out file name]


在SEGFULT位置设置断点,然后开始调试。

其他问题:这是错误的,此函数不会交换任何内容:

void swapColor(struct rbNode *a,struct rbNode *b)
{
    struct rbNode *temp=a;
    a=b;
    b=temp;
}
void swapNumbers(int a, int b)
{
    int temp = a;
    a = b;
    b = temp;
}
问题与此函数中的问题相同:

void swapColor(struct rbNode *a,struct rbNode *b)
{
    struct rbNode *temp=a;
    a=b;
    b=temp;
}
void swapNumbers(int a, int b)
{
    int temp = a;
    a = b;
    b = temp;
}

<>我让你知道为什么做练习.< /p>为什么你在C++代码中使用SCANF?这基本上是C代码。并阅读警告:在z->parent=y行;编译器抱怨y可能未初始化。如何调用newNode和swapColor?问题可能就在那里。请阅读:C/C++语言不存在。你现在使用的语言是C语言,有一些C++的东西。在所有的代码中都有很多未初始化的指针。通常有很多问题,但是我认为这是OP开始使用调试工具和学习不同的调试方法的好机会。