typedef struct Node* node;const int MAXNs = ;//模式串最大長(zhǎng)度 const int MAXNS = ;//文章（待匹配串）最大長(zhǎng)度 struct Node{node next[26];node fail;//失配指針int sum;Node(){sum = 0;fail = NULL;memset(next,NULL,sizeof next);} };char s[MAXNs];//模式串void Insert(node root)//字典樹(shù)的建立 {node p = root;int len = strlen(s);for(int i=0 ; i<len ; ++i){int x = s[i] - 'a';if(p->next[x] == NULL){node newnode = new Node();p->next[x] = newnode;}p = p->next[x];}p->sum++; }void build_fail_pointer(node root)//構(gòu)造fail指針 {queue<node> Q;Q.push(root);node p,temp;while(!Q.empty()){temp = Q.front();Q.pop();for(int i=0 ; i<26 ; ++i){if(temp->next[i]){if(temp == root){temp->next[i]->fail = root;}else{p = temp->fail;while(p){if(p->next[i]){temp->next[i]->fail = p->next[i];break;}p = p->fail;}if(p == NULL) temp->next[i]->fail = root;}Q.push(temp->next[i]);}}} }char S[MAXNS];//文章（待匹配串）int ac_automation(node root)//利用fail指針進(jìn)行匹配。 {node p = root;int len = strlen(S);int ans = 0;for(int i=0 ; i<len ; ++i){int x = S[i] - 'a';while(!p->next[x] && p != root) p = p->fail;p = p->next[x];if(!p) p = root;node temp = p;while(temp != root){if(temp->sum >= 0){ans += temp->sum;temp->sum = -1;}else break;temp = temp->fail;}}return ans; }void Del(node root){for(int i=0 ; i<26 ; ++i){if(root->next[i])Del(root->next[i]);}delete(root); }int main(){int T;// case數(shù)量 scanf("%d",&T);while(T--){int N;//模式串?dāng)?shù)量 node root = new Node();scanf("%d",&N);while(N--){scanf("%s",s);Insert(root);}scanf("%s",S);build_fail_pointer(root);//構(gòu)造fail指針printf("%d\n",ac_automation(root));Del(root);}return 0; }

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轉(zhuǎn)載于:https://www.cnblogs.com/vocaloid01/p/9514016.html

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