test/aho_corasick.test.cpp

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Last update: 2025-08-23 18:02:03+08:00
Problem: https://judge.yosupo.jp/problem/aho_corasick

Depends on

Code

#define PROBLEM "https://judge.yosupo.jp/problem/aho_corasick"

#include "../default/t.cpp"
#include "../string/AhoCorasick.cpp"

signed main() {
  ios::sync_with_stdio(false), cin.tie(NULL);

  int n; cin >> n;
  AhoCorasick ac(1 << 20);
  vector<int> vs;
  for(int i = 0; i < n; i++) {
    string s; cin >> s;
    vs.emplace_back(ac.insert(s));
  }

  ac.build();

  cout << ssize(ac.v) << '\n';
  for(auto &node : ac.v | views::drop(1))
    cout << node.p << ' ' << node.link << '\n';
  cout << vs << '\n';

  return 0;
}

#line 1 "test/aho_corasick.test.cpp"
#define PROBLEM "https://judge.yosupo.jp/problem/aho_corasick"

#line 1 "default/t.cpp"
#include <algorithm>
#include <array>
#include <bitset>
#include <cassert>
#include <cctype>
#include <cfenv>
#include <cfloat>
#include <chrono>
#include <cinttypes>
#include <climits>
#include <cmath>
#include <complex>
#include <cstdarg>
#include <cstddef>
#include <cstdint>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <deque>
#include <fstream>
#include <functional>
#include <initializer_list>
#include <iomanip>
#include <ios>
#include <iostream>
#include <istream>
#include <iterator>
#include <limits>
#include <list>
#include <map>
#include <memory>
#include <new>
#include <numeric>
#include <ostream>
#include <queue>
#include <random>
#include <set>
#include <sstream>
#include <stack>
#include <streambuf>
#include <string>
#include <tuple>
#include <type_traits>
#include <variant>
#include <bit>
#include <compare>
#include <concepts>
#include <numbers>
#include <ranges>
#include <span>

#define INT128_MAX (__int128)(((unsigned __int128) 1 << ((sizeof(__int128) * __CHAR_BIT__) - 1)) - 1)
#define INT128_MIN (-INT128_MAX - 1)

#define clock chrono::steady_clock::now().time_since_epoch().count()

using namespace std;

template<class T1, class T2>
ostream& operator<<(ostream& os, const pair<T1, T2> pr) {
  return os << pr.first << ' ' << pr.second;
}
template<class T, size_t N>
ostream& operator<<(ostream& os, const array<T, N> &arr) {
  for(size_t i = 0; T x : arr) {
    os << x;
    if (++i != N) os << ' ';
  }
  return os;
}
template<class T>
ostream& operator<<(ostream& os, const vector<T> &vec) {
  for(size_t i = 0; T x : vec) {
    os << x;
    if (++i != size(vec)) os << ' ';
  }
  return os;
}
template<class T>
ostream& operator<<(ostream& os, const set<T> &s) {
  for(size_t i = 0; T x : s) {
    os << x;
    if (++i != size(s)) os << ' ';
  }
  return os;
}
template<class T1, class T2>
ostream& operator<<(ostream& os, const map<T1, T2> &m) {
  for(size_t i = 0; pair<T1, T2> x : m) {
    os << x;
    if (++i != size(m)) os << ' ';
  }
  return os;
}

#ifdef DEBUG
#define dbg(...) cerr << '(', _do(#__VA_ARGS__), cerr << ") = ", _do2(__VA_ARGS__)
template<typename T> void _do(T &&x) { cerr << x; }
template<typename T, typename ...S> void _do(T &&x, S&&...y) { cerr << x << ", "; _do(y...); }
template<typename T> void _do2(T &&x) { cerr << x << endl; }
template<typename T, typename ...S> void _do2(T &&x, S&&...y) { cerr << x << ", "; _do2(y...); }
#else
#define dbg(...)
#endif

using ll = long long;
using ull = unsigned long long;
using ldb = long double;
using pii = pair<int, int>;
using pll = pair<ll, ll>;

template<typename T> using min_heap = priority_queue<T, vector<T>, greater<T>>;
template<typename T> using max_heap = priority_queue<T>;

template<ranges::forward_range rng, class T = ranges::range_value_t<rng>, class OP = plus<T>>
void pSum(rng &v) {
  if (!v.empty())
    for(T p = v[0]; T &x : v | views::drop(1))
      x = p = OP()(p, x);
}
template<ranges::forward_range rng, class T = ranges::range_value_t<rng>, class OP>
void pSum(rng &v, OP op) {
  if (!v.empty())
    for(T p = v[0]; T &x : v | views::drop(1))
      x = p = op(p, x);
}

template<ranges::forward_range rng>
void Unique(rng &v) {
  ranges::sort(v);
  v.resize(unique(v.begin(), v.end()) - v.begin());
}

template<ranges::random_access_range rng>
rng invPerm(rng p) {
  rng ret = p;
  for(int i = 0; i < ssize(p); i++)
    ret[p[i]] = i;
  return ret;
}

template<ranges::random_access_range rng, ranges::random_access_range rng2>
rng Permute(rng v, rng2 p) {
  rng ret = v;
  for(int i = 0; i < ssize(p); i++)
    ret[p[i]] = v[i];
  return ret;
}

template<bool directed>
vector<vector<int>> readGraph(int n, int m, int base) {
  vector<vector<int>> g(n);
  for(int i = 0; i < m; i++) {
    int u, v; cin >> u >> v;
    u -= base, v -= base;
    g[u].emplace_back(v);
    if constexpr (!directed)
      g[v].emplace_back(u);
  }
  return g;
}

template<class T>
void setBit(T &msk, int bit, bool x) {
  msk = (msk & ~(T(1) << bit)) | (T(x) << bit);
}
template<class T> void flipBit(T &msk, int bit) { msk ^= T(1) << bit; }
template<class T> bool getBit(T msk, int bit) { return msk >> bit & T(1); }

template<class T>
T floorDiv(T a, T b) {
  if (b < 0) a *= -1, b *= -1;
  return a >= 0 ? a / b : (a - b + 1) / b;
}
template<class T>
T ceilDiv(T a, T b) {
  if (b < 0) a *= -1, b *= -1;
  return a >= 0 ? (a + b - 1) / b : a / b;
}

template<class T> bool chmin(T &a, T b) { return a > b ? a = b, 1 : 0; }
template<class T> bool chmax(T &a, T b) { return a < b ? a = b, 1 : 0; }
#line 1 "string/AhoCorasick.cpp"
struct AhoCorasick {
  struct node {
    static const int size = 26;
    int nxt[size], p, link = -1, ex = -1, leaf = 0;
    char ch;

    node(int _p = -1, char _ch = ' ') : p(_p), ch(_ch) {
      fill(nxt, nxt + size, -1);
    }
  };

  vector<node> v;
  AhoCorasick(int sz) : v(1) {
    v.reserve(sz);
  }

  int insert(string s) {
    int now = 0;
    for(char x : s) {
      int id = x - 'a';
      if (v[now].nxt[id] == -1) {
        v[now].nxt[id] = v.size();
        v.emplace_back(now, x);
      }
      now = v[now].nxt[id];
    }
    v[now].leaf = 1;
    return now;
  }

  int go(int now, char ch) {
    int id = ch - 'a';
    if (v[now].nxt[id] != -1) return v[now].nxt[id];
    else if (now == 0) return 0;
    else return go(v[now].link, ch);
  }

  int calcLink(int now) {
    if (now == 0 or v[now].p == 0) return 0;
    else return go(v[v[now].p].link, v[now].ch);
  }

  int calcExit(int now) {
    if (now == 0) return -1;
    else if (v[v[now].link].leaf) return v[now].link;
    else return v[v[now].link].ex;
  }

  vector<int> build() {
    vector<int> q(1, 0);
    for(int i = 0; i < ssize(q); i++) {
      int now = q[i];
      v[now].link = calcLink(now);
      v[now].ex = calcExit(now);
      for(int j = 0; j < node::size; j++)
        if (v[now].nxt[j] != -1)
          q.emplace_back(v[now].nxt[j]);
    }
    return q;
  }
};
#line 5 "test/aho_corasick.test.cpp"

signed main() {
  ios::sync_with_stdio(false), cin.tie(NULL);

  int n; cin >> n;
  AhoCorasick ac(1 << 20);
  vector<int> vs;
  for(int i = 0; i < n; i++) {
    string s; cin >> s;
    vs.emplace_back(ac.insert(s));
  }

  ac.build();

  cout << ssize(ac.v) << '\n';
  for(auto &node : ac.v | views::drop(1))
    cout << node.p << ' ' << node.link << '\n';
  cout << vs << '\n';

  return 0;
}