hihocoder 1014 : Trie树
link: https://hihocoder.com/problemset/problem/1014
题意:
实现Trie树,实现对单词的快速统计。
#include <iostream>
#include <cstdio>
using namespace std; typedef struct TrieNode{
int cnt;
struct TrieNode *next[26];
}TrieNode; TrieNode memory[2000000];
int alloop = 0; TrieNode* createNode(){
TrieNode* node = &memory[alloop++];
node->cnt = 1;
for(int i=0; i<26; ++i){
node->next[i] = NULL;
}
return node;
} void InsertNode(TrieNode *root, char *c){
TrieNode *cur = root;
for(int i=0; c[i]; ++i){
if(cur->next[c[i]-'a'] == NULL){
cur->next[c[i]-'a'] = createNode();
}else{
cur->next[c[i]-'a']->cnt += 1;
}
cur = cur->next[c[i]-'a'];
}
} int SearchNode(TrieNode* root, char *c){
TrieNode* cur = root;
for(int i=0; c[i]; ++i){
cur = cur->next[c[i]-'a'];
if(cur == NULL){
return 0;
}
}
return cur->cnt;
} int main(){
freopen("in.txt", "r", stdin); int n,m, ans;
char st[12];
TrieNode* root = createNode();
root->cnt = 0;
scanf("%d", &n);
for(int i=0; i<n; ++i){
scanf("%s", st);
getchar();
InsertNode(root, st);
}
scanf("%d", &m);
for(int i=0; i<m; ++i){
scanf("%s", st);
getchar();
ans = SearchNode(root, st);
printf("%d\n", ans);
}
return 0;
}