#689533 (C++17) No.1646 Avoid Palindrome

• 問題: No.1646 Avoid Palindrome
• ユーザー: keijak
• 提出日時: 2021-08-13 23:07:15
• 言語: C++17 (gcc 12.3.0 + boost 1.83.0)
• 結果: AC
• 実行時間: 1,892 ms / 3,000 ms
• コード長: 3,351 bytes
• コンパイル時間: 2,726 ms
• コンパイル使用メモリ: 211,184 KB
• 実行使用メモリ: 5,248 KB
• 最終ジャッジ日時: 2024-11-08 16:01:34
• 合計ジャッジ時間: 43,357 ms
• ジャッジサーバーID （参考情報）: judge5 / judge4

入力	結果	実行時間; 実行使用メモリ
testcase_00	AC	2 ms; 5,248 KB
testcase_01	AC	2 ms; 5,248 KB
testcase_02	AC	2 ms; 5,248 KB
testcase_03	AC	2 ms; 5,248 KB
testcase_04	AC	900 ms; 5,248 KB
testcase_05	AC	887 ms; 5,248 KB
testcase_06	AC	863 ms; 5,248 KB
testcase_07	AC	892 ms; 5,248 KB
testcase_08	AC	899 ms; 5,248 KB
testcase_09	AC	842 ms; 5,248 KB
testcase_10	AC	866 ms; 5,248 KB
testcase_11	AC	833 ms; 5,248 KB
testcase_12	AC	889 ms; 5,248 KB
testcase_13	AC	925 ms; 5,248 KB
testcase_14	AC	1,706 ms; 5,248 KB
testcase_15	AC	1,744 ms; 5,248 KB
testcase_16	AC	1,694 ms; 5,248 KB
testcase_17	AC	1,778 ms; 5,248 KB
testcase_18	AC	1,741 ms; 5,248 KB
testcase_19	AC	1,717 ms; 5,248 KB
testcase_20	AC	1,748 ms; 5,248 KB
testcase_21	AC	1,786 ms; 5,248 KB
testcase_22	AC	1,726 ms; 5,248 KB
testcase_23	AC	1,806 ms; 5,248 KB
testcase_24	AC	1,871 ms; 5,248 KB
testcase_25	AC	1,885 ms; 5,248 KB
testcase_26	AC	1,892 ms; 5,248 KB
testcase_27	AC	1,850 ms; 5,248 KB
testcase_28	AC	1,862 ms; 5,248 KB
testcase_29	AC	327 ms; 5,248 KB
testcase_30	AC	328 ms; 5,248 KB
testcase_31	AC	319 ms; 5,248 KB
testcase_32	AC	336 ms; 5,248 KB
testcase_33	AC	327 ms; 5,248 KB
testcase_34	AC	1,854 ms; 5,248 KB
testcase_35	AC	2 ms; 5,248 KB
testcase_36	AC	2 ms; 5,248 KB
testcase_37	AC	2 ms; 5,248 KB
testcase_38	AC	2 ms; 5,248 KB
testcase_39	AC	2 ms; 5,248 KB
testcase_40	AC	2 ms; 5,248 KB
testcase_41	AC	2 ms; 5,248 KB
testcase_42	AC	2 ms; 5,248 KB
testcase_43	AC	328 ms; 5,248 KB

ソースコード

#include <bits/stdc++.h>
#define REP_(i, a_, b_, a, b, ...) \
  for (int i = (a), END_##i = (b); i < END_##i; ++i)
#define REP(i, ...) REP_(i, __VA_ARGS__, __VA_ARGS__, 0, __VA_ARGS__)
#define ALL(x) std::begin(x), std::end(x)
using i64 = long long;

#include <atcoder/modint>
using Mint = atcoder::modint998244353;
std::ostream &operator<<(std::ostream &os, const Mint &m) {
  return os << m.val();
}

template<typename T, typename U>
inline bool chmax(T &a, U b) {
  return a < b and ((a = std::move(b)), true);
}
template<typename T, typename U>
inline bool chmin(T &a, U b) {
  return a > b and ((a = std::move(b)), true);
}
template<typename T>
inline int ssize(const T &a) {
  return (int) std::size(a);
}

template<typename T>
std::istream &operator>>(std::istream &is, std::vector<T> &a) {
  for (auto &x : a) is >> x;
  return is;
}
template<typename T, typename U>
std::ostream &operator<<(std::ostream &os, const std::pair<T, U> &a) {
  return os << "(" << a.first << ", " << a.second << ")";
}
template<typename Container>
std::ostream &print_seq(const Container &a, std::string_view sep = " ",
                        std::string_view ends = "\n",
                        std::ostream &os = std::cout) {
  auto b = std::begin(a), e = std::end(a);
  for (auto it = std::begin(a); it != e; ++it) {
    if (it != b) os << sep;
    os << *it;
  }
  return os << ends;
}
template<typename T, typename = void>
struct is_iterable : std::false_type {};
template<typename T>
struct is_iterable<T, std::void_t<decltype(std::begin(std::declval<T>())),
                                  decltype(std::end(std::declval<T>()))>>
    : std::true_type {
};

template<typename T, typename = std::enable_if_t<
    is_iterable<T>::value &&
        !std::is_same<T, std::string_view>::value &&
        !std::is_same<T, std::string>::value>>
std::ostream &operator<<(std::ostream &os, const T &a) {
  return print_seq(a, ", ", "", (os << "{")) << "}";
}

void print() { std::cout << "\n"; }
template<class T>
void print(const T &x) {
  std::cout << x << "\n";
}
template<typename Head, typename... Tail>
void print(const Head &head, Tail... tail) {
  std::cout << head << " ";
  print(tail...);
}

void read_from_cin() {}
template<typename T, typename... Ts>
void read_from_cin(T &value, Ts &...args) {
  std::cin >> value;
  read_from_cin(args...);
}
#define INPUT(type, ...) \
  type __VA_ARGS__;      \
  read_from_cin(__VA_ARGS__)

#ifdef MY_DEBUG
#include "debug_dump.hpp"
#else
#define DUMP(...)
#endif

using namespace std;

auto solve() {
  INPUT(int, n);
  INPUT(string, s);
  assert(ssize(s) == n);
  char nothing = 26;
  auto dp = vector(2, vector(27, vector(27, Mint(0))));
  dp[0][nothing][nothing] = 1;

  REP(i, n) {
    REP(c, 26) {
      if (s[i] != '?' and (s[i] - 'a') != c) continue;
      REP(c1, 27) {
        REP(c2, 27) {
          if (c != c1 and c != c2) {
            dp[1][c][c1] += dp[0][c1][c2];
          }
        }
      }
    }
    swap(dp[0], dp[1]);
    REP(c1, 27) {
      REP(c2, 27) {
        dp[1][c1][c2] = 0;
      }
    }
  }
  Mint ans = 0;
  REP(c1, 27) REP(c2, 27) {
      ans += dp[0][c1][c2];
    }
  return ans;
}

int main() {
  ios_base::sync_with_stdio(false), cin.tie(nullptr);
  cout << std::fixed << std::setprecision(15);
  int t = 1;
  REP(test_case, t) {
    auto ans = solve();
    print(ans);
  }
}