标签:des style http color java os io strong
3 AA BB CC ooxxCC%dAAAoen....END
AA: 2 CC: 1HintHit: 题目描述中没有被提及的所有情况都应该进行考虑。比如两个病毒特征码可能有相互包含或者有重叠的特征码段。 计数策略也可一定程度上从Sample中推测。
#include<cstdio> #include<cstring> using namespace std; const int kind = 26; //有多少种字符 const int N = 1005; const int M = 2000005; struct node { node *next[kind]; node *fail; int id;//病毒编号 node() { for(int i = 0; i < kind; i++) next[i] = NULL; fail = NULL; id = 0; } }*q[51*N]; node *root; int head, tail; char source[M], s[M]; char vir[N][55]; int cnt[N]; void Insert(char *str, int id) { node *p = root; int i = 0, index; while(str[i]) { index = str[i] - 'A'; if(p->next[index] == NULL) p->next[index] = new node(); p = p->next[index]; i++; } p->id = id; } void build_ac_automation(node *root) { root->fail = NULL; q[tail++] = root; node *p = NULL; while(head < tail) { node *temp = q[head++]; for(int i = 0; i < kind; i++) { if(temp->next[i] != NULL) { if(temp == root) temp->next[i]->fail = root; else { p = temp->fail; while(p != NULL) { if(p->next[i] != NULL) { temp->next[i]->fail = p->next[i]; break; } p = p->fail; } if(p == NULL) temp->next[i]->fail = root; } q[tail++] = temp->next[i]; } } } } void Query(char *str) { int i = 0, index; node *p = root; while(str[i]) { index = str[i] - 'A'; while(p->next[index] == NULL && p != root) p = p->fail; p = p->next[index]; if(p == NULL) p = root; node *temp = p; while(temp != root && temp->id > 0) { cnt[temp->id]++; temp = temp->fail; } i++; } } int main() { int n; while(~scanf("%d",&n)) { memset(cnt, 0, sizeof(cnt)); head = tail = 0; root = new node(); for(int i = 1; i <= n; i++) { scanf("%s", vir[i]); Insert(vir[i], i); } build_ac_automation(root); scanf("%s",source); int len = strlen(source); int l = 0; for(int i = 0; i <= len; i++) { if(source[i] >= 'A' && source[i] <= 'Z') //因为病毒中只有大写字母,所以只处理连续的大写字母组成的字符串 s[l++] = source[i]; else { s[l] = '\0'; Query(s); l = 0; } } for(int i = 1; i <= n; i++) if(cnt[i]) printf("%s: %d\n",vir[i], cnt[i]); } return 0; }
hdu 3065 病毒侵袭持续中(AC自动机),布布扣,bubuko.com
标签:des style http color java os io strong
原文地址:http://blog.csdn.net/lyhvoyage/article/details/38586913