American Heritage

本文提供了一种使用递归算法从两个字符串中构造第三个字符串的方法。通过C++代码实现了基于后序遍历和中序遍历来求解先序遍历的问题。

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刘汝佳小白书上有递归写法的源代码。

/*
ID:jinbo wu
LANG:C++
TASK:heritage
*/
#include<bits/stdc++.h>  
using namespace std;
void solve(int n,char *s1,char *s2,char *s)
{
      if(n<=0) return ;
      int p=strchr(s2,s1[0])-s2;
      solve(p,s1+1,s2,s);
      solve(n-p-1,s1+p+1,s2+p+1,s+p);
      s[n-1]=s1[0];

}
int main()
{
	freopen("heritage.in","r",stdin);
	freopen("heritage.out","w",stdout);
	char s1[30];
	char s2[30];
	char ans[30];
	cin>>s1;
	cin>>s2;
	int n=strlen(s1);
	solve(n,s2,s1,ans);
	ans[n]='\0';
	cout<<ans<<endl;

}
过几天数据结构考试没准要考这个顺便把后序,中序求先序也写出来。

#include<bits/stdc++.h>
using namespace std;
void build(int n,char *s1,char*s2,char*s)
{
	if(n<=0) return;
	int p=strchr(s2,s1[n-1])-s2;
	s[0]=s1[n-1];
	build(p,s1,s2,s+1);
	build(n-p-1,s1+p,s2+p+1,s+p+1);
}
int main()
{
	char s1[30],s2[30],ans[30];
	cin>>s1>>s2;
	build(strlen(s1),s1,s2,ans);
	ans[strlen(s1)]='\0';
	cout<<ans<<endl;
	
}



American Heritage 题目描述 Farmer John takes the heritage of his cows very seriously. He is not, however, a truly fine bookkeeper. He keeps his cow genealogies as binary trees and, instead of writing them in graphic form, he records them in the more linear tree in-order" and tree pre-order" notations. Your job is to create the `tree post-order" notation of a cow"s heritage after being given the in-order and pre-order notations. Each cow name is encoded as a unique letter. (You may already know that you can frequently reconstruct a tree from any two of the ordered traversals.) Obviously, the trees will have no more than 26 nodes. Here is a graphical representation of the tree used in the sample input and output: C / \ / \ B G / \ / A D H / \ E F The in-order traversal of this tree prints the left sub-tree, the root, and the right sub-tree. The pre-order traversal of this tree prints the root, the left sub-tree, and the right sub-tree. The post-order traversal of this tree print the left sub-tree, the right sub-tree, and the root. ---------------------------------------------------------------------------------------------------------------------------- 题目大意: 给出一棵二叉树的中序遍历 (inorder) 和前序遍历 (preorder),求它的后序遍历 (postorder)。 输入描述 Line 1: The in-order representation of a tree. Line 2: The pre-o rder representation of that same tree. Only uppercase letter A-Z will appear in the input. You will get at least 1 and at most 26 nodes in the tree. 输出描述 A single line with the post-order representation of the tree. 样例输入 Copy to Clipboard ABEDFCHG CBADEFGH 样例输出 Copy to Clipboard AEFDBHGC c语言,代码不要有注释
最新发布
06-16
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