#line 1 "a.cpp" #define PROBLEM "https://yukicoder.me/problems/no/0263" #line 2 "/home/kuhaku/atcoder/github/algo/lib/template/template.hpp" #pragma GCC target("sse4.2,avx2,bmi2") #pragma GCC optimize("O3") #pragma GCC optimize("unroll-loops") #include template bool chmax(T &a, const U &b) { return a < (T)b ? a = (T)b, true : false; } template bool chmin(T &a, const U &b) { return (T)b < a ? a = (T)b, true : false; } constexpr std::int64_t INF = 1000000000000000003; constexpr int Inf = 1000000003; constexpr int MOD = 1000000007; constexpr int MOD_N = 998244353; constexpr double EPS = 1e-7; constexpr double PI = M_PI; #line 3 "/home/kuhaku/atcoder/github/algo/lib/template/macro.hpp" #define FOR(i, m, n) for (int i = (m); i < int(n); ++i) #define FORR(i, m, n) for (int i = (m)-1; i >= int(n); --i) #define FORL(i, m, n) for (int64_t i = (m); i < int64_t(n); ++i) #define rep(i, n) FOR (i, 0, n) #define repn(i, n) FOR (i, 1, n + 1) #define repr(i, n) FORR (i, n, 0) #define repnr(i, n) FORR (i, n + 1, 1) #define all(s) (s).begin(), (s).end() #line 3 "/home/kuhaku/atcoder/github/algo/lib/template/sonic.hpp" struct Sonic { Sonic() { std::ios::sync_with_stdio(false); std::cin.tie(nullptr); } constexpr void operator()() const {} } sonic; #line 5 "/home/kuhaku/atcoder/github/algo/lib/template/atcoder.hpp" using namespace std; using ll = std::int64_t; using ld = long double; template std::istream &operator>>(std::istream &is, std::pair &p) { return is >> p.first >> p.second; } template std::istream &operator>>(std::istream &is, std::vector &v) { for (T &i : v) is >> i; return is; } template std::ostream &operator<<(std::ostream &os, const std::pair &p) { return os << '(' << p.first << ',' << p.second << ')'; } template std::ostream &operator<<(std::ostream &os, const std::vector &v) { for (auto it = v.begin(); it != v.end(); ++it) { os << (it == v.begin() ? "" : " ") << *it; } return os; } template void co(Head &&head, Tail &&...tail) { if constexpr (sizeof...(tail) == 0) std::cout << head << '\n'; else std::cout << head << ' ', co(std::forward(tail)...); } template void ce(Head &&head, Tail &&...tail) { if constexpr (sizeof...(tail) == 0) std::cerr << head << '\n'; else std::cerr << head << ' ', ce(std::forward(tail)...); } template auto make_vector(T x, int arg, Args... args) { if constexpr (sizeof...(args) == 0) return std::vector(arg, x); else return std::vector(arg, make_vector(x, args...)); } void setp(int n) { std::cout << std::fixed << std::setprecision(n); } void Yes(bool is_correct = true) { std::cout << (is_correct ? "Yes" : "No") << '\n'; } void No(bool is_not_correct = true) { Yes(!is_not_correct); } void YES(bool is_correct = true) { std::cout << (is_correct ? "YES" : "NO") << '\n'; } void NO(bool is_not_correct = true) { YES(!is_not_correct); } void Takahashi(bool is_correct = true) { std::cout << (is_correct ? "Takahashi" : "Aoki") << '\n'; } void Aoki(bool is_not_correct = true) { Takahashi(!is_not_correct); } #line 2 "/home/kuhaku/atcoder/github/algo/lib/tree/palindromic_tree.hpp" struct palindromic_tree { private: struct _node { using pointer = _node *; std::map link; int suffix_link; int len; int count; _node() : link(), suffix_link(), len(), count() {} _node(int _suffix_link, int _len, int _count) : link(), suffix_link(_suffix_link), len(_len), count(_count) {} }; public: using node_type = _node; using node_pointer = typename _node::pointer; palindromic_tree() : nodes(), str(), active_idx() { create_node(0, -1, 0); create_node(0, 0, 0); } int size() const { return nodes.size(); } int get_active_idx() const { return active_idx; } node_pointer get_node(int id) { return &nodes[id]; } int add(char ch) { str.push_back(ch); int a = find_prev_palindrome_idx(active_idx); auto inserted_result = nodes[a].link.insert(std::make_pair(ch, int(nodes.size()))); active_idx = inserted_result.first->second; if (!inserted_result.second) { nodes[active_idx].count++; return active_idx; } node_pointer node = create_node(0, nodes[a].len + 2, 1); if (node->len == 1) { node->suffix_link = 1; } else { int b = find_prev_palindrome_idx(nodes[a].suffix_link); node->suffix_link = nodes[b].link[ch]; } return active_idx; } int move(char ch) { str.push_back(ch); while (true) { active_idx = find_prev_palindrome_idx(active_idx); auto it = nodes[active_idx].link.find(ch); if (it != nodes[active_idx].link.end()) { active_idx = it->second; return active_idx; } if (active_idx == 0) break; active_idx = nodes[active_idx].suffix_link; } return active_idx; } std::vector build_frequency() { std::vector res(nodes.size()); for (int i = int(nodes.size()) - 1; i > 0; --i) { res[i] += nodes[i].count; res[nodes[i].suffix_link] += res[i]; } return res; } void clear() { str.clear(); active_idx = 0; } private: std::vector nodes; std::string str; int active_idx; node_pointer create_node(int suffix_link, int len, int count) { nodes.emplace_back(suffix_link, len, count); return &nodes.back(); } int find_prev_palindrome_idx(int node_id) { int pos = int(str.size()) - 1; while (true) { int opposite_side_idx = pos - 1 - nodes[node_id].len; if (opposite_side_idx >= 0 && str[opposite_side_idx] == str.back()) break; node_id = nodes[node_id].suffix_link; } return node_id; } }; #line 4 "a.cpp" int main(void) { string s, t; cin >> s >> t; palindromic_tree pt; for (auto c : s) pt.add(c); auto v = pt.build_frequency(); vector vs(all(v)); int m = vs.size(); rep (i, m) { if (i < 2) continue; int p = pt.get_node(i)->suffix_link; if (p >= 2) vs[i] += vs[p]; } pt.clear(); ll ans = 0; for (auto c : t) { int idx = pt.move(c); if (idx >= 2) ans += vs[idx]; } co(ans); return 0; }