4-3-4.cpp

#include<iostream>
#define ELEMTYPE int
#define MAXSIZE 50
#define END 9999
#define NOP -1
using namespace std;
typedef struct BiNode{
    ELEMTYPE data;
    struct BiNode *lchild,*rchild;
}BiNode,*BiTree;
typedef struct ListNode{
    int lchild;
    int rchild;
    ELEMTYPE data;
}List;

BiTree q[MAXSIZE];
int front=0,rear=0;
bool EnQueue(BiTree p){
    if((rear+1)%MAXSIZE!=front){
        q[rear]=p;
        rear=(rear+1)%MAXSIZE;
        return true;
    }else return false;
}
bool DeQueue(BiTree &p){
    if(front!=rear){
        p=q[front];
        front=(front+1)%MAXSIZE;
        return true;
    }else return false;
}
bool IsQueueEmpty(){
    if(front==rear)return true;
    return false;
}
void fun_start(BiTree &T);
void fun(BiTree &T){
    BiTree stk[MAXSIZE];
    BiTree p;
    int top=0;
    if(T){
        EnQueue(T);
        while(!IsQueueEmpty()){
            DeQueue(p);
            stk[top++]=p;
            if(p->lchild)EnQueue(p->lchild);
            if(p->rchild)EnQueue(p->rchild);
        }
        while(--top>=0)cout<<stk[top]->data<<" ";
    }
}






//不使用第一项
void InitList(List L[]){
    int x=0,y=0,n=0;
    ELEMTYPE d;
    L[0]={0,0,0};
    cout<<"input numbers of tree node:"<<endl;
    cin>>n;
    for(int i=1;n<MAXSIZE&&i<=n;i++){
        cin>>x>>y>>d;
        L[i].lchild=x;
        L[i].rchild=y;
        L[i].data=d;
    }
}
void InitTreeWithList(BiTree &T,List L[],int index){
    if(index!=NOP){
        BiTree nd=(BiTree)malloc(sizeof(BiNode));
        nd->data=L[index].data;
        T=nd;
        InitTreeWithList(T->lchild,L,L[index].lchild);
        InitTreeWithList(T->rchild,L,L[index].rchild);
    }else{
        T=NULL;
    }
}
// 1 for PreOrder,2 for InOrder,3 for PostOrder
void PrintTree(BiTree T,int x){
    if(T){
        if(x==1){
            cout<<T->data<<" ";
        }
        PrintTree(T->lchild,x);
        if(x==2){
            cout<<T->data<<" ";
        }
        PrintTree(T->rchild,x);
        if(x==3){
            cout<<T->data<<" ";
        }
        free(T);
    }
}
void fun_start(BiTree &T){
    //以下是一个预置的初始化数组
    //不使用第一项
    List L0[10]={{0,0,0},{2,3,11},{4,5,12},{6,NOP,13},{NOP,7,14},{NOP,8,15},{NOP,NOP,16},{9,NOP,17},{NOP,NOP,18},{NOP,NOP,19}};
    List L[MAXSIZE];
    //InitList(L);
    InitTreeWithList(T,L0,1);
    cout<<"fun:"<<endl;
    fun(T);
    cout<<endl;
    PrintTree(T,1);
}



int main(){
    BiTree T;
    fun_start(T);
    cout<<endl;
    return 0;
}