7-20 玩轉二叉鏈表 (20 分)
設計程序,按先序創建二叉樹的二叉鏈表;然後先序、中序、後序遍歷二叉樹。
輸入格式:
按先序輸入一棵二叉樹。二叉樹中每個結點的鍵值用字符表示,字符之間不含空格。注意空樹信息也要提供,以#字符表示空樹。
輸出格式:
輸出3行。第一行是先序遍歷二叉樹的序列,第二行是中序遍歷二叉樹的序列,第三行是後序遍歷二叉樹的序列。每行首尾不得有多餘空格。序列中不含#。
輸入樣例:
ab##dc###
輸出樣例:
abdc
bacd
bcda
#include <stdio.h>
#include <stdlib.h>
typedef char ElementType;
typedef struct TNode *Position;
typedef Position BinTree;
struct TNode {
ElementType Data;
BinTree Left;
BinTree Right;
};
BinTree CreatBinTree() {//先序建立二叉鏈表
BinTree B;
char cp;
scanf("%c",&cp);
if(cp=='#'){
B=(BinTree)malloc(sizeof(struct TNode));
//B=NULL;
B->Data='#';
B->Left=B->Right=NULL;
}
else {
B=(BinTree)malloc(sizeof(struct TNode));
B->Data =cp;
B->Left =CreatBinTree();
B->Right=CreatBinTree();
}
return B;
}
void PreorderPrintLeaves1( BinTree BT ) {//先
if(BT->Data !='#') {
printf("%c",BT->Data );
PreorderPrintLeaves1( BT->Left );
PreorderPrintLeaves1( BT->Right );
}
}
void PreorderPrintLeaves2( BinTree BT ) {//中
if(BT->Data !='#') {
PreorderPrintLeaves2( BT->Left );
printf("%c",BT->Data );
PreorderPrintLeaves2( BT->Right );
}
}
void PreorderPrintLeaves3( BinTree BT ) {//後
if(BT->Data !='#') {
PreorderPrintLeaves3( BT->Left );
PreorderPrintLeaves3( BT->Right );
printf("%c",BT->Data );
}
}
int main() {
BinTree BT = CreatBinTree();
PreorderPrintLeaves1(BT);
printf("\n");
PreorderPrintLeaves2(BT);
printf("\n");
PreorderPrintLeaves3(BT);
printf("\n");
return 0;
}