mirror of
https://git.sb/baoshuo/OI-codes.git
synced 2024-11-08 13:38:48 +00:00
parent
37cb0c04e9
commit
7cd4ddfcee
@ -11,29 +11,32 @@ class AcAutomaton {
|
||||
private:
|
||||
struct node {
|
||||
int cnt;
|
||||
std::shared_ptr<node> child[26], fail;
|
||||
std::weak_ptr<node> child[26], fail;
|
||||
|
||||
node()
|
||||
: cnt(0), fail(nullptr) {
|
||||
std::fill(std::begin(child), std::end(child), nullptr);
|
||||
}
|
||||
: cnt(0), fail() {}
|
||||
};
|
||||
|
||||
std::shared_ptr<node> root;
|
||||
std::vector<std::shared_ptr<node>> nodes;
|
||||
|
||||
public:
|
||||
AcAutomaton()
|
||||
: root(new node()) {}
|
||||
: root(new node()), nodes() {}
|
||||
|
||||
void insert(std::string s) {
|
||||
std::shared_ptr<node> cur = root;
|
||||
|
||||
for (char c : s) {
|
||||
if (cur->child[c - 'a'] == nullptr) {
|
||||
cur->child[c - 'a'] = std::make_shared<node>();
|
||||
auto child_ptr = cur->child[c - 'a'].lock();
|
||||
|
||||
if (child_ptr == nullptr) {
|
||||
child_ptr = std::make_shared<node>();
|
||||
nodes.emplace_back(child_ptr); // Trick: store all nodes in a vector to avoid early expiration of weak_ptr
|
||||
cur->child[c - 'a'] = child_ptr;
|
||||
}
|
||||
|
||||
cur = cur->child[c - 'a'];
|
||||
cur = child_ptr;
|
||||
}
|
||||
|
||||
cur->cnt++;
|
||||
@ -43,9 +46,11 @@ class AcAutomaton {
|
||||
std::queue<std::shared_ptr<node>> q;
|
||||
|
||||
for (int i = 0; i < 26; i++) {
|
||||
if (root->child[i] != nullptr) {
|
||||
q.emplace(root->child[i]);
|
||||
root->child[i]->fail = root;
|
||||
auto child_ptr = root->child[i].lock();
|
||||
|
||||
if (child_ptr != nullptr) {
|
||||
q.emplace(child_ptr);
|
||||
child_ptr->fail = root;
|
||||
}
|
||||
}
|
||||
|
||||
@ -54,12 +59,27 @@ class AcAutomaton {
|
||||
q.pop();
|
||||
|
||||
for (int i = 0; i < 26; i++) {
|
||||
if (cur->child[i] != nullptr) {
|
||||
cur->child[i]->fail = cur->fail->child[i] == nullptr ? root : cur->fail->child[i];
|
||||
auto fail_ptr = cur->fail.lock(),
|
||||
child_ptr = cur->child[i].lock();
|
||||
|
||||
q.emplace(cur->child[i]);
|
||||
if (child_ptr != nullptr) {
|
||||
if (fail_ptr != nullptr) {
|
||||
auto fail_child_ptr = fail_ptr->child[i].lock();
|
||||
|
||||
child_ptr->fail = fail_child_ptr == nullptr ? root : fail_child_ptr;
|
||||
} else {
|
||||
cur->child[i] = cur->fail->child[i] == nullptr ? root : cur->fail->child[i];
|
||||
child_ptr->fail = root;
|
||||
}
|
||||
|
||||
q.emplace(child_ptr);
|
||||
} else {
|
||||
if (fail_ptr != nullptr) {
|
||||
auto fail_child_ptr = fail_ptr->child[i].lock();
|
||||
|
||||
cur->child[i] = fail_child_ptr == nullptr ? root : fail_child_ptr;
|
||||
} else {
|
||||
cur->child[i] = root;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
@ -67,12 +87,16 @@ class AcAutomaton {
|
||||
|
||||
int query(std::string t) {
|
||||
int res = 0;
|
||||
std::shared_ptr<node> cur = root;
|
||||
auto cur = root;
|
||||
|
||||
for (char c : t) {
|
||||
cur = cur->child[c - 'a'] == nullptr ? root : cur->child[c - 'a'];
|
||||
auto child_ptr = cur->child[c - 'a'].lock();
|
||||
|
||||
for (std::shared_ptr<node> i = cur; i != nullptr && i->cnt != -1; i = i->fail) {
|
||||
cur = child_ptr == nullptr ? root : child_ptr;
|
||||
|
||||
for (auto i = cur;
|
||||
i != nullptr && i->cnt != -1;
|
||||
i = i->fail.lock()) {
|
||||
res += i->cnt;
|
||||
i->cnt = -1;
|
||||
}
|
||||
|
Loading…
Reference in New Issue
Block a user