数据结构实验之二叉树五:层序遍历
Time Limit: 1000 ms Memory Limit: 65536 KiB
其实层序遍历就是一个递归存储的过程
Problem Description
已知一个按先序输入的字符序列,如abd,,eg,,,cf,,,(其中,表示空结点)。请建立二叉树并求二叉树的层次遍历序列。
Input
输入数据有多行,第一行是一个整数t (t<1000),代表有t行测试数据。每行是一个长度小于50个字符的字符串。
Output
输出二叉树的层次遍历序列。
Sample Input
2
abd,,eg,,,cf,,,
xnl,,i,,u,,
Sample Output
abcdefg
xnuli
Hint
Source
xam
#include <stdio.h>
#include<stdlib.h>
#include<string.h>
int l;
char s[51];
typedef struct node
{
char data;
struct node *left , *right;
}tree;
tree *creat()
{
char c;
c = s[l++];
tree *root;
if (c == ',')
return NULL;
else
{
root = (tree * )malloc(sizeof (tree));
root ->data = c;
root ->left = creat();
root ->right = creat();
}
return root;
}
void cengxu(tree *root)
{
int in = 0 , out = 0;
tree *a[1050];
a[in++] = root;
while(in > out)
{
if (a[out] != NULL)
{
printf("%c" , a[out] ->data);
a[in++] = a[out]->left;
a[in++] = a[out] ->right;
}
out ++;
}
}
int main()
{
int t;
tree *root;
scanf("%d" , &t);
while(t--)
{
scanf("%s" , s);
l = 0;
root = (tree *)malloc(sizeof(tree));
root = creat();
cengxu(root);
printf("\n");
}
return 0;
}