Hdu 1075+ Hdu 1251 (动态Trie)

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大概两周前写的，拿出来总结下。

貌似这两题都没告诉数据规模，所以才想起练练动态写法，真心不喜欢用指针……

Hdu 1075

//重新写了一个动态开辟节点的.本题用map应该也可以#include <cstdio>#include <cstring>#include <iostream>using namespace std;struct Trie{Trie *next[26];char dic[10];Trie (){dic[0]=0;for (int i=0;i<26;i++)next[i]=NULL;}};Trie *root=NULL;char str1[15],str2[15];void Insert (){Trie *p=root;if (p==NULL){root=new Trie();p=root;}int i=0;while (str2[i]){if (p->next[str2[i]-'a']==NULL)p->next[str2[i]-'a']=new Trie();p=p->next[str2[i++]-'a'];}strcpy (p->dic,str1);}bool Find (){Trie *p=root;if (p==NULL)return false;int i=0;while (str1[i]){if (p->next[str1[i]-'a']==NULL)return false;p=p->next[str1[i++]-'a'];}if (p->dic[0]==0)return false;printf("%s",p->dic);return true;}int main (){#ifdef ONLINE_JUDGE#elsefreopen("read.txt","r",stdin);#endifscanf("%*s");while (scanf("%s",str1),strcmp(str1,"END")){scanf("%s",str2);Insert();}scanf("%*s");int i=0;bool flag=false;   //标记是否读入了一个单词char ch;getchar();while (scanf("%c",&ch))if (ch>='a'&& ch<='z'){str1[i++]=ch;flag=true;}else{if (flag){str1[i]=0;if (Find()==false)   //找到时在Find()中输出printf("%s",str1);flag=false;}i=0;if (ch=='E')break;printf("%c",ch);}return 0;}

Hdu 1251

#include <cstdio>#include <cstring>#include <iostream>using namespace std;struct Trie{int num;Trie *next[26];Trie (){num=0;for (int i=0;i<26;i++)next[i]=NULL;}};Trie *root=NULL;void Insert (char str[]){Trie *p=root;if (p==NULL){root=new Trie();p=root;}int i=0;while (str[i]){if (p->next[str[i]-'a']==NULL)p->next[str[i]-'a']=new Trie();p=p->next[str[i++]-'a'];p->num++;}}int Find (char str[]){Trie *p=root;if (p==NULL)return false;int i=0;while (str[i]){if (p->next[str[i]-'a']==NULL)return 0;p=p->next[str[i++]-'a'];}return p->num;}int main (){#ifdef ONLINE_JUDGE#elsefreopen("read.txt","r",stdin);#endifchar str[15];while (gets(str),strcmp(str,""))Insert (str);while (~scanf("%s",str))printf("%d\n",Find (str));return 0;}