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地址:http://acm.split.hdu.edu.cn/showproblem.php?pid=1251
题目:
Time Limit: 4000/2000 MS (Java/Others) Memory Limit: 131070/65535 K (Java/Others)
Total Submission(s): 35141 Accepted Submission(s): 13175
思路:Trie树,每个节点记录以此为前缀的单词的数量
代码:
#include <stdio.h> #include <stdlib.h> #include <string.h> #define MAXNUM 26 //定义字典树结构体 typedef struct Trie { int cnt; Trie *next[MAXNUM]; }Trie; //声明一个根 Trie *root; //初始化该根 void init() { root = (Trie *)malloc(sizeof(Trie)); root->cnt=0; for(int i=0;i<MAXNUM;i++) root->next[i]=NULL; } //对该字典树的插入单词操作 void insert(char *word) { Trie *tem = root; while(*word!=‘\0‘) { if(tem->next[*word-‘a‘]==NULL) { Trie *cur = (Trie *)malloc(sizeof(Trie)); for(int i=0;i<MAXNUM;i++) cur->next[i]=NULL; cur->cnt=0; tem->next[*word-‘a‘]=cur; } tem = tem->next[*word-‘a‘]; tem->cnt++; word++; } } //查询一个单词的操作 int search(char *word) { Trie *tem = root; for(int i=0;word[i]!=‘\0‘;i++) { if(tem==NULL||tem->next[word[i]-‘a‘]==NULL) return 0; tem=tem->next[word[i]-‘a‘]; } return tem->cnt; } int main(void) { init(); //freopen("in.txt","r",stdin); char ss[11]; while(gets(ss)&&strlen(ss)) insert(ss); while(~scanf("%s",ss)) printf("%d\n",search(ss)); return 0; }
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原文地址:http://www.cnblogs.com/weeping/p/5932391.html