test/verify/yosupo-enumerate-palindromes.test.cpp

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• Last update: 2025-08-16 01:23:21+09:00
• Problem: https://judge.yosupo.jp/problem/enumerate_palindromes

Depends on

• Manacher(最長回文) (string/manacher.hpp)
• template/template.hpp

Code

// competitive-verifier: PROBLEM https://judge.yosupo.jp/problem/enumerate_palindromes

#include "../../template/template.hpp"

#include "../../string/manacher.hpp"

int main() {
  string s;
  cin >> s;
  cout << manacher(s) << "\n";
}

#line 1 "test/verify/yosupo-enumerate-palindromes.test.cpp"
// competitive-verifier: PROBLEM https://judge.yosupo.jp/problem/enumerate_palindromes

#line 1 "template/template.hpp"
#include <bits/stdc++.h>
#if __has_include(<atcoder/all>)
#include <atcoder/all>
#endif

using namespace std;

using int64 = long long;

const int64 infll = (1LL << 62) - 1;
const int inf = (1 << 30) - 1;

struct IoSetup {
  IoSetup() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    cout << fixed << setprecision(10);
    cerr << fixed << setprecision(10);
  }
} iosetup;

template <typename T1, typename T2>
ostream& operator<<(ostream& os, const pair<T1, T2>& p) {
  os << p.first << " " << p.second;
  return os;
}

template <typename T1, typename T2>
istream& operator>>(istream& is, pair<T1, T2>& p) {
  is >> p.first >> p.second;
  return is;
}

template <typename T>
ostream& operator<<(ostream& os, const vector<T>& v) {
  for (int i = 0; i < (int)v.size(); i++) {
    os << v[i] << (i + 1 != v.size() ? " " : "");
  }
  return os;
}

template <typename T>
istream& operator>>(istream& is, vector<T>& v) {
  for (T& in : v) is >> in;
  return is;
}

template <typename T1, typename T2>
inline bool chmax(T1& a, T2 b) {
  return a < b && (a = b, true);
}

template <typename T1, typename T2>
inline bool chmin(T1& a, T2 b) {
  return a > b && (a = b, true);
}

template <typename T = int64>
vector<T> make_v(size_t a) {
  return vector<T>(a);
}

template <typename T, typename... Ts>
auto make_v(size_t a, Ts... ts) {
  return vector<decltype(make_v<T>(ts...))>(a, make_v<T>(ts...));
}

template <typename T, typename V>
typename enable_if<is_class<T>::value == 0>::type fill_v(T& t, const V& v) {
  t = v;
}

template <typename T, typename V>
typename enable_if<is_class<T>::value != 0>::type fill_v(T& t, const V& v) {
  for (auto& e : t) fill_v(e, v);
}

template <typename F>
struct FixPoint : F {
  explicit FixPoint(F&& f) : F(std::forward<F>(f)) {}

  template <typename... Args>
  decltype(auto) operator()(Args&&... args) const {
    return F::operator()(*this, std::forward<Args>(args)...);
  }
};

template <typename F>
inline decltype(auto) MFP(F&& f) {
  return FixPoint<F>{std::forward<F>(f)};
}
#line 4 "test/verify/yosupo-enumerate-palindromes.test.cpp"

#line 1 "string/manacher.hpp"
/**
 * @brief Manacher(最長回文)
 */
template <typename S>
vector<int> manacher(S s, bool calc_even = true) {
  if (calc_even) {
    int n = (int)s.size();
    assert(n > 0);
    s.resize(2 * n - 1);
    for (int i = n - 1; i >= 0; i--) {
      s[2 * i] = s[i];
    }
    auto d = *min_element(begin(s), end(s));
    for (int i = 0; i < n - 1; i++) {
      s[2 * i + 1] = d;
    }
  }
  int n = (int)s.size();
  vector<int> rad(n);
  {
    int i = 0, j = 0;
    while (i < n) {
      while (i - j >= 0 && i + j < n && s[i - j] == s[i + j]) ++j;
      rad[i] = j;
      int k = 1;
      while (i - k >= 0 && i + k < n && k + rad[i - k] < j) {
        rad[i + k] = rad[i - k];
        ++k;
      }
      i += k, j -= k;
    }
  }
  if (calc_even) {
    for (int i = 0; i < n; i++) {
      if (((i ^ rad[i]) & 1) == 0) rad[i]--;
    }
  } else {
    for (auto&& x : rad) x = 2 * x - 1;
  }
  return rad;
}
#line 6 "test/verify/yosupo-enumerate-palindromes.test.cpp"

int main() {
  string s;
  cin >> s;
  cout << manacher(s) << "\n";
}

Test cases

Env	Name	Status	Elapsed	Memory
g++	all_same_00	AC	59 ms	9 MB
g++	all_same_01	AC	59 ms	9 MB
g++	all_same_02	AC	60 ms	9 MB
g++	all_same_03	AC	67 ms	9 MB
g++	all_same_04	AC	60 ms	9 MB
g++	example_00	AC	5 ms	4 MB
g++	example_01	AC	4 ms	4 MB
g++	example_02	AC	4 ms	4 MB
g++	example_03	AC	4 ms	4 MB
g++	max_random_00	AC	58 ms	9 MB
g++	max_random_01	AC	59 ms	9 MB
g++	max_random_02	AC	58 ms	9 MB
g++	max_random_03	AC	58 ms	9 MB
g++	max_random_04	AC	59 ms	9 MB
g++	random_00	AC	47 ms	8 MB
g++	random_01	AC	54 ms	8 MB
g++	random_02	AC	11 ms	4 MB
g++	random_03	AC	50 ms	8 MB
g++	random_04	AC	35 ms	7 MB
g++	small_00	AC	5 ms	4 MB
g++	small_01	AC	4 ms	4 MB
g++	small_02	AC	4 ms	4 MB
g++	small_03	AC	4 ms	4 MB
g++	small_04	AC	4 ms	4 MB
clang++	all_same_00	AC	69 ms	9 MB
clang++	all_same_01	AC	70 ms	9 MB
clang++	all_same_02	AC	61 ms	9 MB
clang++	all_same_03	AC	60 ms	9 MB
clang++	all_same_04	AC	61 ms	9 MB
clang++	example_00	AC	5 ms	4 MB
clang++	example_01	AC	4 ms	4 MB
clang++	example_02	AC	4 ms	4 MB
clang++	example_03	AC	4 ms	4 MB
clang++	max_random_00	AC	59 ms	9 MB
clang++	max_random_01	AC	60 ms	9 MB
clang++	max_random_02	AC	58 ms	9 MB
clang++	max_random_03	AC	56 ms	9 MB
clang++	max_random_04	AC	57 ms	9 MB
clang++	random_00	AC	45 ms	8 MB
clang++	random_01	AC	52 ms	9 MB
clang++	random_02	AC	10 ms	4 MB
clang++	random_03	AC	51 ms	8 MB
clang++	random_04	AC	33 ms	6 MB
clang++	small_00	AC	5 ms	4 MB
clang++	small_01	AC	5 ms	4 MB
clang++	small_02	AC	4 ms	4 MB
clang++	small_03	AC	4 ms	4 MB
clang++	small_04	AC	4 ms	4 MB

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