字典树模板
#include<stdio.h> #include<string.h> #define kind 26//字母种类 struct Treenode//树的结点结构 { int count;//这个附加变量在本题中记录遍历到该结点形成的字符串出现的次数,在不同题中可记录不同的内容。 Treenode *next[kind];//指向儿子结点 Treenode()//每个结点的初始化 { count=1; for(int i=0;i<kind;i++) next[i]=NULL; } }; void insert(Treenode *&root,char *word)//向以root为根结点的树中插入串word { Treenode *location=root; int i=0,branch=0; if(location==NULL) { location=new Treenode(); root=location; } while(word[i]) { branch=word[i]-'a'; if(location->next[branch]) location->next[branch]->count++;//如果该字符存在,串数量加1 else location->next[branch]=new Treenode();//如果不存在,建新结点 i++; location=location->next[branch]; } } int search(Treenode *&root,char *word)//查找,与插入类似 { Treenode *location=root; int i=0,branch=0,ans; if(location==NULL) return 0; while(word[i]) { branch=word[i]-'a'; if(!location->next[branch]) return 0; i++; location=location->next[branch]; ans=location->count; } return ans; } int main() { char word[101][10]; char ask[10]; Treenode *root=NULL; int n,i; scanf("%d",&n); for(i=0;i<n;i++) { scanf("%s",word[i]); insert(root,word[i]); } while(scanf("%s",ask)!=EOF) { printf("%d ",search(root,ask)); } return 0; }