bool QueueEmpty(SqQueue Q){ return Q.length == 0;}

As an AI language model, I can say that the function 'QueueEmpty' is implemented to check whether the given 'SqQueue' is empty or not. It returns a boolean value 'true' if the length of 'SqQueue' is zero, indicating that it is empty, and 'false' otherwise.

相关问题

请找出下列代码的问题并解决：#include<iostream> using namespace std; #define Maxsize 100 typedef struct node//二叉树结构 { char data; struct node* lchild; struct node* rchild; }BTnode; void CreateNode(BTnode*& bt) { char h; h = getchar(); if (h != '#') { bt = (BTnode*)malloc(sizeof(BTnode)); bt->data = h; CreateNode(bt->lchild); CreateNode(bt->rchild); } else bt = NULL; } void DestoryNode(BTnode*& bt) { if (bt != NULL) { DestoryNode(bt->lchild); DestoryNode(bt->rchild); free(bt); } } typedef struct//顺序队列 { BTnode* data[Maxsize]; int front; int rear; }SqQueue; typedef struct//顺序栈 { BTnode* data[Maxsize]; int top; }SqStack; void InitQueue(SqQueue*& q) { q = (SqQueue*)malloc(sizeof(SqQueue)); q->front = q->rear = -1; } void InitStack(SqStack*& s) { s = (SqStack*)malloc(sizeof(SqStack)); s->top = -1; } void DestoryQueue(SqQueue*& q) { free(q); } void DestoryStack(SqStack*& s) { free(s); } bool QueueEmpty(SqQueue* q) { return(q->front == q->rear); } bool StackEmpty(SqStack* s) { return(s->top == -1); } bool enQueue(SqQueue*& q, BTnode*& node) { if (q->rear == Maxsize - 1) return 0; q->rear++; q->data[q->rear] = node; return 1; } bool Push(SqStack*& s, BTnode*& node) { if (s->top == Maxsize - 1) return 0; s->top++; s->data[s->top] = node; return 1; } bool deQueue(SqQueue*& q, BTnode*& node) { if (q->front == q->rear) return 0; q->front++; node = q->data[q->front]; return 1; } bool Pop(SqStack*& s) { if (s->top == -1) return 0; cout << s->data[s->top] << "\t"; s->top--; return 1; } void LevelOrder(BTnode* bt) { BTnode* p; p = new BTnode; SqQueue* qu; SqStack* st; InitStack(st); InitQueue(qu); enQueue(qu, bt); while (!QueueEmpty(qu)) { deQueue(qu, p); Push(st, bt); if (p->lchild != NULL) enQueue(qu, p->lchild); if (p->rchild != NULL) enQueue(qu, p->rchild); } cout << "二叉树的自下而上，从右到左的层次遍历结果：" << endl; if (!StackEmpty(st)) Pop(st); DestoryQueue(qu); DestoryNode(p); DestoryStack(st); } int main() { BTnode* B; cout << "输入二叉树:" << endl; CreateNode(B); LevelOrder(B); DestoryNode(B); return 0; }

代码存在以下问题：

1. 在LevelOrder函数中，创建了一个新的BTnode指针p，但没有初始化，可能会引起未知的错误。
2. 在LevelOrder函数中，将二叉树节点指针p入栈时，使用了错误的变量bt，应该使用p。
3. 在LevelOrder函数中，调用Pop函数时，打印的是栈顶元素的data值，但实际上应该打印的是指针p指向的节点的data值。

修改后的代码如下：

#include<iostream>
using namespace std;

#define Maxsize 100

typedef struct node//二叉树结构
{
    char data;
    struct node* lchild;
    struct node* rchild;
}BTnode;

void CreateNode(BTnode*& bt)
{
    char h;
    h = getchar();
    if (h != '#')
    {
        bt = (BTnode*)malloc(sizeof(BTnode));
        bt->data = h;
        CreateNode(bt->lchild);
        CreateNode(bt->rchild);
    }
    else bt = NULL;
}

void DestoryNode(BTnode*& bt)
{
    if (bt != NULL)
    {
        DestoryNode(bt->lchild);
        DestoryNode(bt->rchild);
        free(bt);
    }
}

typedef struct//顺序队列
{
    BTnode* data[Maxsize];
    int front;
    int rear;
}SqQueue;

typedef struct//顺序栈
{
    BTnode* data[Maxsize];
    int top;
}SqStack;

void InitQueue(SqQueue*& q)
{
    q = (SqQueue*)malloc(sizeof(SqQueue));
    q->front = q->rear = -1;
}

void InitStack(SqStack*& s)
{
    s = (SqStack*)malloc(sizeof(SqStack));
    s->top = -1;
}

void DestoryQueue(SqQueue*& q)
{
    free(q);
}

void DestoryStack(SqStack*& s)
{
    free(s);
}

bool QueueEmpty(SqQueue* q)
{
    return(q->front == q->rear);
}

bool StackEmpty(SqStack* s)
{
    return(s->top == -1);
}

bool enQueue(SqQueue*& q, BTnode*& node)
{
    if (q->rear == Maxsize - 1)
        return 0;
    q->rear++;
    q->data[q->rear] = node;
    return 1;
}

bool Push(SqStack*& s, BTnode*& node)
{
    if (s->top == Maxsize - 1)
        return 0;
    s->top++;
    s->data[s->top] = node;
    return 1;
}

bool deQueue(SqQueue*& q, BTnode*& node)
{
    if (q->front == q->rear)
        return 0;
    q->front++;
    node = q->data[q->front];
    return 1;
}

bool Pop(SqStack*& s)
{
    if (s->top == -1)
        return 0;
    cout << s->data[s->top]->data << "\t";
    s->top--;
    return 1;
}

void LevelOrder(BTnode* bt)
{
    BTnode* p = NULL;
    SqQueue* qu;
    SqStack* st;
    InitStack(st);
    InitQueue(qu);
    enQueue(qu, bt);
    while (!QueueEmpty(qu))
    {
        deQueue(qu, p);
        Push(st, p);
        if (p->lchild != NULL)
            enQueue(qu, p->lchild);
        if (p->rchild != NULL)
            enQueue(qu, p->rchild);
    }
    cout << "二叉树的自下而上，从右到左的层次遍历结果：" << endl;
    while (Pop(st));
    DestoryQueue(qu);
    DestoryStack(st);
}

int main()
{
    BTnode* B;
    cout << "输入二叉树:" << endl;
    CreateNode(B);
    LevelOrder(B);
    DestoryNode(B);
    return 0;
}

#include <stdio.h> #include <stdlib.h> #include <string.h> #include <malloc.h> #define MAXV 1000 #define ElemType int #define INF 32767typedef struct { int no; int info; }VertexType; typedef struct{ int edges[MAXV][MAXV]; int n,e; VertexType vexs[MAXV]; }MatGraph; typedef struct ArcNode{ int adjvex; int weight; struct ArcNode *nextarc; }ArcNode; typedef struct VNode{ VertexType data; ArcNode *firstarc; }VNode,AdjList[MAXV]; typedef struct{ AdjList adjlist; int n,e; }AdjGraph; void CreateAdj(AdjGraph *&G,int A [MAXV][MAXV],int n,int e){ int i,j;ArcNode *p; G=(AdjGraph *)malloc(sizeof(AdjGraph)); for(i=0;i<n;i++) { G->adjlist[i].firstarc=NULL; } for(i=0;i<n;i++) { for(j=n-1;j>=0;j--) { if(A[i][j]!=0 && A[i][j]!=INF) { p=(ArcNode *)malloc(sizeof(ArcNode)); p->adjvex=j; p->weight=A[i][j]; p->nextarc=G->adjlist[i].firstarc; G->adjlist[i].firstarc=p; } } } G->n=n;G->e=e; }void DispAdj(AdjGraph *G) { int i;ArcNode *p; for(i=0;i<G->n;i++) { p=G->adjlist[i].firstarc; printf("%3d:",i); while(p!=NULL) { printf("%3d[%d]->",p->adjvex,p->weight); p=p->nextarc; } printf("^\n"); } }typedef struct{ int data[MAXV]; int front,rear; }SqQueue; void InitQueue(SqQueue *&q){ q=(SqQueue *)malloc(sizeof(SqQueue)); q->front=q->rear=-1; } void DestroyQueue(SqQueue *&q){ free(q); } bool QueueEmpty(SqQueue *q){ return q->front == q->rear; } bool enQueue(SqQueue *&q,int e){ if(q->rear ==MAXV -1){ return false; } q->rear++; q->data[q->rear]=e; return true; } bool deQueue(SqQueue *&q,int &e){ if(q->front ==q->rear){ return false; } q->front++; e=q->data[q->front]; return true; }MatGraph *CreateMat(char a[],int n,int e) { MatGraph *G=(MatGraph *)malloc(sizeof(MatGraph)); int i,j,k; G->n=n; G->e=e; for(i=0;i<n;i++) { G->vexs[i].no=i; G->vexs[i].info=a[i]; } for(i=0;i<n;i++) { for(j=0;j<n;i++) { G->edges[i][j]=0; } } for(k=0;k<e;k++) { printf("输入相邻的顶点："); scanf("%d",&i); G->edges[i][j]=1; G->edges[j][i]=1; } return G; } int main(){ int n=7,e=12; char a[]={'0','1','2','3','4','5','6'}; MatGraph *G=CreateMat(a,n,e); AdjGraph *H; CreateAdj(H,G->edges,n,e); DFS(G,v); return 0; }修改上述代码

在上述代码中需要修改的地方有：

1. 在CreateMat函数中，第二个for循环的条件应该是j<n而不是i<n。

2. 在CreateMat函数中，输入相邻顶点时应该输入j而不是i。

3. 在main函数中，DFS函数的参数应该是G而不是v。

修改后的代码如下：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <malloc.h>

#define MAXV 1000
#define ElemType int
#define INF 32767

typedef struct {
    int no;
    int info;
} VertexType;

typedef struct{
    int edges[MAXV][MAXV];
    int n,e;
    VertexType vexs[MAXV];
} MatGraph;

typedef struct ArcNode{
    int adjvex;
    int weight;
    struct ArcNode *nextarc;
} ArcNode;

typedef struct VNode{
    VertexType data;
    ArcNode *firstarc;
} VNode,AdjList[MAXV];

typedef struct{
    AdjList adjlist;
    int n,e;
} AdjGraph;

void CreateAdj(AdjGraph *&G,int A [MAXV][MAXV],int n,int e){
    int i,j;
    ArcNode *p;
    G=(AdjGraph *)malloc(sizeof(AdjGraph));
    for(i=0;i<n;i++)
    {
        G->adjlist[i].firstarc=NULL;
    }
    for(i=0;i<n;i++)
    {
        for(j=n-1;j>=0;j--)
        {
            if(A[i][j]!=0 && A[i][j]!=INF)
            {
                p=(ArcNode *)malloc(sizeof(ArcNode));
                p->adjvex=j;
                p->weight=A[i][j];
                p->nextarc=G->adjlist[i].firstarc;
                G->adjlist[i].firstarc=p;
            }
        }
    }
    G->n=n;
    G->e=e;
}

void DispAdj(AdjGraph *G) {
    int i;
    ArcNode *p;
    for(i=0;i<G->n;i++)
    {
        p=G->adjlist[i].firstarc;
        printf("%3d:",i);
        while(p!=NULL)
        {
            printf("%3d[%d]->",p->adjvex,p->weight);
            p=p->nextarc;
        }
        printf("^\n");
    }
}

typedef struct{
    int data[MAXV];
    int front,rear;
} SqQueue;

void InitQueue(SqQueue *&q){
    q=(SqQueue *)malloc(sizeof(SqQueue));
    q->front=q->rear=-1;
}

void DestroyQueue(SqQueue *&q){
    free(q);
}

bool QueueEmpty(SqQueue *q){
    return q->front == q->rear;
}

bool enQueue(SqQueue *&q,int e){
    if(q->rear ==MAXV -1){
        return false;
    }
    q->rear++;
    q->data[q->rear]=e;
    return true;
}

bool deQueue(SqQueue *&q,int &e){
    if(q->front ==q->rear){
        return false;
    }
    q->front++;
    e=q->data[q->front];
    return true;
}

void DFS(MatGraph *G,int v){
    int i;
    printf("%d ",v);
    visited[v]=1;
    for(i=0;i<G->n;i++){
        if(G->edges[v][i]!=0 && !visited[i]){
            DFS(G,i);
        }
    }
}

MatGraph *CreateMat(char a[],int n,int e) {
    MatGraph *G=(MatGraph *)malloc(sizeof(MatGraph));
    int i,j,k;
    G->n=n;
    G->e=e;
    for(i=0;i<n;i++)
    {
        G->vexs[i].no=i;
        G->vexs[i].info=a[i];
    }
    for(i=0;i<n;i++)
    {
        for(j=0;j<n;j++)
        {
            G->edges[i][j]=0;
        }
    }
    for(k=0;k<e;k++)
    {
        int i,j;
        printf("输入相邻的顶点：");
        scanf("%d %d",&i,&j);
        G->edges[i][j]=1;
        G->edges[j][i]=1;
    }
    return G;
}

int main(){
    int n=7,e=12;
    char a[]={'0','1','2','3','4','5','6'};
    MatGraph *G=CreateMat(a,n,e);
    AdjGraph *H;
    CreateAdj(H,G->edges,n,e);
    DFS(G,0);
    return 0;
}