王道训练营3月29日

  1 #include <stdio.h>
  2 #include <stdlib.h>
  3 #include <string.h>
  4 #include <malloc.h>
  5 typedef struct node
  6 {
  7     int val;
  8     struct node* lchild;
  9     struct node* rchild;
 10 }node,*pnode;
 11 
 12 
 13 int creatTree(pnode *root,int arr[],int len);
 14 int insertTree(pnode *root,int elem);
 15 int printTree(pnode root,int len);
 16 void inOrder(pnode root);
 17 
 18 
 19 
 20 
 21 int main(int argc,char* argv[])
 22 {
 23     int arr[] = {5,8,7,9,4,10,1};
 24     int len = sizeof(arr)/sizeof(arr[0]);
 25     int i;
 26     for(i=0;i<len;i++)
 27     {
 28         printf("%-3d",arr[i]);
 29     }
 30     printf("\n");
 31     pnode root = NULL;
 32     creatTree(&root,arr,len);
 33     inOrder(root);
 34     return 0;
 35 }
 36 
 37 int creatTree(pnode *root,int arr[],int len)
 38 {
 39     int i;
 40     for(i=0;i<len;i++)
 41     {
 42         insertTree(root,arr[i]);
 43     }
 44     return 1;
 45 }
 46 
 47 int insertTree(pnode *root,int elem)
 48 {
 49     pnode pnew = NULL;
 50     pnew = (pnode)(calloc(1,sizeof(node)));
 51     pnew->val = elem;
 52     pnew->lchild = NULL;
 53     pnew->rchild = NULL;
 54     pnode pcur = NULL;
 55     if(*root == NULL)
 56     {
 57         *root = pnew;
 58     }
 59     else {
 60         pcur = *root;
 61         while(1)
 62         {
 63             if(pcur->val > elem)
 64             {
 65                 if(pcur->lchild==NULL)
 66                 {
 67                     pcur->lchild = pnew;
 68                     break;
 69                 }
 70                 else {
 71                     pcur = pcur->lchild;
 72                     continue;
 73                 }
 74             }
 75             if(pcur->val <= elem)
 76             {
 77                 if(pcur->rchild==NULL)
 78                 {
 79                     pcur->rchild = pnew;
 80                     break;
 81                 }
 82                 else {
 83                     pcur = pcur->rchild;
 84                     continue;
 85                 }
 86             }
 87         }
 88     }
 89     return 1;
 90 }
 91 
 92 void inOrder(pnode root)    //后序遍历
 93 {
 94     if(root)
 95     {
 96         inOrder(root->lchild);
 97         inOrder(root->rchild);
 98         printf("%d ",root->val);
 99     }
100 }