数据结构实验之二叉树五:层序遍历
Time Limit: 1000MS Memory Limit: 65536KB
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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。
Example Input
2
abd,,eg,,,cf,,,
xnl,,i,,u,,
Example Output
abcdefg
xnuli
Hint
Author
xam
#include <iostream>
#include <cstdio>
#include <cstring>
using namespace std;
const int MAX = 205;
typedef struct node
{
char data;
struct node *cl, *cr;
} tree, *ptree;
char str[MAX];
int i;
void gettreepre(ptree &root)
{
char ch;
ch = str[i++];
if (ch == ',')
{
root = NULL;
}
else
{
root = new tree;
root->data = ch;
gettreepre(root->cl);
gettreepre(root->cr);
}
}
void cengxuorder(ptree root)
{
if (root == NULL)
{
cout << endl;
return;
}
ptree arr[MAX];
int front, rear;
front = rear = 0;
arr[rear++] = root;
while (front < rear)
{
cout << arr[front]->data;
if (arr[front]->cl != NULL)
arr[rear++] = arr[front]->cl;
if (arr[front]->cr != NULL)
arr[rear++] = arr[front]->cr;
front++;
}
cout << endl;
}
int main()
{
int n;
cin >> n;
while (n--)
{
cin >> str;
i = 0;
ptree root = NULL;
gettreepre(root);
cengxuorder(root);
}
return 0;
}