*题目记录 codevs3143 二叉树的序遍历

Posted 2021-01-08

#include<stdio.h>

typedef struct node{
    int boo; 
    struct node *chil;
    int l;
    struct node *chir;
    int r;
};
int bl(node *p);
int bj(node *q);
int bk(node *r);

int main(){
    struct node k[16];
    int n;
    scanf("%d",&n);
    for(int i=1;i<=n;i++){
        k[i].boo=i;
    } 
    for(int i=1;i<=n;i++){
        k[i].boo=i;
        int a,b;
        scanf("%d %d",&a,&b);
        if(a != 0){
            k[i].chil=&k[a];
            k[i].l=1;
        }else{
            k[i].l=0;
        }
        if(b != 0){
            k[i].chir=&k[b];
            k[i].r=1;
        }else{
            k[i].r=0;
        }
    }
    //输入数据 
    bl(&k[1]);
    printf("
");
    bj(&k[1]);
    printf("
");
    bk(&k[1]);
    return 0;
} 

int bl(node *p){
    printf("%d ",p->boo);
    if((p->l) == 1){
        bl(&(*p->chil));
    }
    if((p->r) == 1){
        bl(&(*p->chir));
    }
}

int bj(node *q){
    if((q->l)==1){
        bj(&(*q->chil));
    }
    printf("%d ",q->boo);
    if((q->r)==1){
        bj(&(*q->chir));
    }
}

int bk(node *r){
    if((r->l)==1){
        bk(&(*r->chil));
    }
    if((r->r)==1){
        bk(&(*r->chir));
    }
    printf("%d ",r->boo);
}