#967933 (C++23) No.1269 I hate Fibonacci Number

• 問題: No.1269 I hate Fibonacci Number
• ユーザー: cureskol
• 提出日時: 2024-03-31 20:45:57
• 言語: C++23 (gcc 15.2.0 + boost 1.89.0)
• 結果: CE (最新)
  AC
  (最初)
• 実行時間: -
• コード長: 3,659 bytes
• コンパイル時間: 2,093 ms
• コンパイル使用メモリ: 338,476 KB
• 最終ジャッジ日時: 2026-04-16 22:58:05
• 合計ジャッジ時間: 3,039 ms
• ジャッジサーバーID （参考情報）: judge1_0 / judge2_0

コンパイルメッセージ

main.cpp: In member function 'std::map<long unsigned int, unsigned int> AhoCorasick<SIGMA, MARGIN>::path(const std::string&) const':
main.cpp:92:30: error: cannot decompose inaccessible member 'std::map<long unsigned int, unsigned int>::_M_t' of 'const std::map<long unsigned int, unsigned int>' [-Wtemplate-body]
   92 |             for (const auto &[key, value] : vertex_counts)
      |                              ^~~~~~~~~~~~
In file included from /home/linuxbrew/.linuxbrew/Cellar/gcc/15.2.0_1/include/c++/15/map:65,
                 from /home/linuxbrew/.linuxbrew/Cellar/gcc/15.2.0_1/include/c++/15/x86_64-pc-linux-gnu/bits/stdc++.h:155,
                 from main.cpp:1:
/home/linuxbrew/.linuxbrew/Cellar/gcc/15.2.0_1/include/c++/15/bits/stl_map.h:161:17: note: declared private here
  161 |       _Rep_type _M_t;
      |                 ^~~~

ソースコード

#include <bits/stdc++.h>

template <size_t SIGMA = 26, char MARGIN = 'a'> class Trie {
    struct Node {
        std::array<int, SIGMA> nxt;
        Node() { std::ranges::fill(nxt, -1); }
    };

  protected:
    std::vector<Node> nodes;

  public:
    Trie() : nodes(1, Node()) {}

    int &nxt(size_t v, char c) { return nodes[v].nxt[c - MARGIN]; }

    size_t add(const std::string &s) {
        size_t now = 0;
        for (char c : s) {
            if (nxt(now, c) < 0) {
                nxt(now, c) = nodes.size();
                nodes.push_back(Node());
            }
            now = nxt(now, c);
        }
        return now;
    }

    std::vector<size_t> add(const std::vector<std::string> &v) {
        std::vector<size_t> ret;
        ret.reserve(v.size());
        for (const std::string &s : v)
            ret.push_back(add(s));
        return ret;
    }
};

template <size_t SIGMA = 26, char MARGIN = 'a'>
class AhoCorasick : Trie<SIGMA, MARGIN> {
    using super = Trie<SIGMA, MARGIN>;
    using super::nodes;

    std::vector<std::map<size_t, uint32_t>> vertex_counts;

  public:
    using super::nxt;
    using super::Trie;

    std::vector<size_t> add(const std::vector<std::string> &v) {
        auto ret = super::add(v);
        size_t n = nodes.size();
        vertex_counts.resize(n);

        std::vector<bool> exist(n, false);
        for (size_t v : ret)
            exist[v] = true;

        std::vector<size_t> suffix(n);
        std::queue<size_t> que;
        que.push(0);
        while (que.size()) {
            size_t v = que.front();
            que.pop();
            if (v) {
                if (exist[v])
                    vertex_counts[v][v]++;
                for (const auto &[key, value] : vertex_counts[suffix[v]])
                    vertex_counts[v][key] += value;
            }

            for (size_t i = 0; i < SIGMA; i++) {
                int &to = nodes[v].nxt[i];
                if (~to) {
                    suffix[to] = v ? nodes[suffix[v]].nxt[i] : 0;
                    que.push(to);
                } else
                    to = v ? nodes[suffix[v]].nxt[i] : 0;
            }
        }
        return ret;
    }

    const std::map<size_t, uint32_t> &count(size_t v) const {
        return vertex_counts[v];
    }

    std::map<size_t, uint32_t> path(const std::string &s) const {
        std::map<size_t, uint32_t> ret;
        size_t v = 0;
        for (const char &c : s) {
            v = nxt(v, c);
            for (const auto &[key, value] : vertex_counts)
                ret[key] += value;
        }
        return ret;
    }
};

#include <atcoder/modint>
using mint = atcoder::modint1000000007;

int main() {
    std::ios::sync_with_stdio(false);
    std::cin.tie(nullptr);

    int n;
    std::cin >> n;
    uint64_t l, r;
    std::cin >> l >> r;

    std::vector<uint64_t> fib{1, 2};
    while (fib.back() < r)
        fib.push_back(fib[fib.size() - 2] + fib[fib.size() - 1]);

    std::vector<std::string> v;
    for (const auto &x : fib) {
        if (std::clamp(x, l, r) != x)
            continue;
        v.push_back(std::to_string(x));
    }

    AhoCorasick<10, '0'> T;
    T.add(v);

    std::map<size_t, mint> dp{{0, 1}};
    while (n--) {
        std::map<size_t, mint> nxt;
        for (const auto &[v, val] : dp) {
            for (char c = '0'; c <= '9'; c++) {
                size_t to = T.nxt(v, c);
                if (T.count(to).size())
                    continue;
                nxt[to] += val;
            }
        }
        dp = nxt;
    }
    mint ans = -1;
    for (const auto &[key, val] : dp)
        ans += val;
    std::cout << ans.val() << '\n';
}