#695959 (C++17) No.1668 Grayscale

提出ソース

結果

問題	No.1668 Grayscale
ユーザー	stoq
提出日時	2021-09-03 23:12:07
言語	C++17 (gcc 12.3.0 + boost 1.83.0)
結果	WA
実行時間	-
コード長	6,238 bytes
コンパイル時間	5,005 ms
コンパイル使用メモリ	280,244 KB
実行使用メモリ	192,928 KB
最終ジャッジ日時	2024-05-09 06:51:14
合計ジャッジ時間	9,648 ms
ジャッジサーバーID （参考情報）	judge3 / judge5

このコードへのチャレンジ
（要ログイン）

テストケース

テストケース表示

入力	結果	実行時間実行使用メモリ
testcase_00	WA	-
testcase_01	AC	15 ms 9,216 KB
testcase_02	AC	16 ms 9,088 KB
testcase_03	AC	15 ms 9,088 KB
testcase_04	WA	-
testcase_05	AC	17 ms 9,216 KB
testcase_06	WA	-
testcase_07	AC	490 ms 192,928 KB
testcase_08	AC	744 ms 164,184 KB
testcase_09	WA	-
testcase_10	WA	-
testcase_11	WA	-
testcase_12	WA	-
testcase_13	WA	-
testcase_14	WA	-
testcase_15	WA	-
testcase_16	WA	-
testcase_17	WA	-
testcase_18	AC	16 ms 9,216 KB
testcase_19	WA	-
testcase_20	WA	-
testcase_21	WA	-
testcase_22	AC	16 ms 9,216 KB
testcase_23	AC	15 ms 9,216 KB

権限があれば一括ダウンロードができます

ソースコード

raw source code

#define MOD_TYPE 1

#pragma region Macros

#include <bits/stdc++.h>
using namespace std;

#include <atcoder/all>
using namespace atcoder;

#if 0
#include <boost/multiprecision/cpp_dec_float.hpp>
#include <boost/multiprecision/cpp_int.hpp>
using Int = boost::multiprecision::cpp_int;
using lld = boost::multiprecision::cpp_dec_float_100;
#endif

#if 1
#pragma GCC target("avx2")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#endif

using ll = long long int;
using ld = long double;
using pii = pair<int, int>;
using pll = pair<ll, ll>;
using pld = pair<ld, ld>;
template <typename Q_type>
using smaller_queue = priority_queue<Q_type, vector<Q_type>, greater<Q_type>>;

#if MOD_TYPE == 1
constexpr ll MOD = ll(1e9 + 7);
#else
#if MOD_TYPE == 2
constexpr ll MOD = 998244353;
#else
constexpr ll MOD = 1000003;
#endif
#endif

using mint = static_modint<MOD>;
constexpr int INF = (int)1e9 + 10;
constexpr ll LINF = (ll)4e18;
constexpr double PI = acos(-1.0);
constexpr double EPS = 1e-11;
constexpr int Dx[] = {0, 0, -1, 1, -1, 1, -1, 1, 0};
constexpr int Dy[] = {1, -1, 0, 0, -1, -1, 1, 1, 0};

#define REP(i, m, n) for (ll i = m; i < (ll)(n); ++i)
#define rep(i, n) REP(i, 0, n)
#define REPI(i, m, n) for (int i = m; i < (int)(n); ++i)
#define repi(i, n) REPI(i, 0, n)
#define MP make_pair
#define MT make_tuple
#define YES(n) cout << ((n) ? "YES" : "NO") << "\n"
#define Yes(n) cout << ((n) ? "Yes" : "No") << "\n"
#define possible(n) cout << ((n) ? "possible" : "impossible") << "\n"
#define Possible(n) cout << ((n) ? "Possible" : "Impossible") << "\n"
#define Yay(n) cout << ((n) ? "Yay!" : ":(") << "\n"
#define all(v) v.begin(), v.end()
#define NP(v) next_permutation(all(v))
#define dbg(x) cerr << #x << ":" << x << "\n";
#define UNIQUE(v) v.erase(unique(all(v)), v.end())

struct io_init {
  io_init() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    cout << setprecision(30) << setiosflags(ios::fixed);
  };
} io_init;
template <typename T>
inline bool chmin(T &a, T b) {
  if (a > b) {
    a = b;
    return true;
  }
  return false;
}
template <typename T>
inline bool chmax(T &a, T b) {
  if (a < b) {
    a = b;
    return true;
  }
  return false;
}
inline ll CEIL(ll a, ll b) { return (a + b - 1) / b; }
template <typename A, size_t N, typename T>
inline void Fill(A (&array)[N], const T &val) {
  fill((T *)array, (T *)(array + N), val);
}
template <typename T>
vector<T> compress(vector<T> &v) {
  vector<T> val = v;
  sort(all(val)), val.erase(unique(all(val)), val.end());
  for (auto &&vi : v) vi = lower_bound(all(val), vi) - val.begin();
  return val;
}
template <typename T, typename U>
constexpr istream &operator>>(istream &is, pair<T, U> &p) noexcept {
  is >> p.first >> p.second;
  return is;
}
template <typename T, typename U>
constexpr ostream &operator<<(ostream &os, pair<T, U> p) noexcept {
  os << p.first << " " << p.second;
  return os;
}
ostream &operator<<(ostream &os, mint m) {
  os << m.val();
  return os;
}

random_device seed_gen;
mt19937_64 engine(seed_gen());

struct BiCoef {
  vector<mint> fact_, inv_, finv_;
  BiCoef(int n) noexcept : fact_(n, 1), inv_(n, 1), finv_(n, 1) {
    fact_.assign(n, 1), inv_.assign(n, 1), finv_.assign(n, 1);
    for (int i = 2; i < n; i++) {
      fact_[i] = fact_[i - 1] * i;
      inv_[i] = -inv_[MOD % i] * (MOD / i);
      finv_[i] = finv_[i - 1] * inv_[i];
    }
  }
  mint C(ll n, ll k) const noexcept {
    if (n < k || n < 0 || k < 0) return 0;
    return fact_[n] * finv_[k] * finv_[n - k];
  }
  mint P(ll n, ll k) const noexcept { return C(n, k) * fact_[k]; }
  mint H(ll n, ll k) const noexcept { return C(n + k - 1, k); }
  mint Ch1(ll n, ll k) const noexcept {
    if (n < 0 || k < 0) return 0;
    mint res = 0;
    for (int i = 0; i < n; i++)
      res += C(n, i) * mint(n - i).pow(k) * (i & 1 ? -1 : 1);
    return res;
  }
  mint fact(ll n) const noexcept {
    if (n < 0) return 0;
    return fact_[n];
  }
  mint inv(ll n) const noexcept {
    if (n < 0) return 0;
    return inv_[n];
  }
  mint finv(ll n) const noexcept {
    if (n < 0) return 0;
    return finv_[n];
  }
};

BiCoef bc(500010);

#pragma endregion

struct SCC {
  int V;
  vector<vector<int>> G, Gr;
  vector<int> comp, order, used;

  SCC(int V_) : V(V_), G(V_), Gr(V_), comp(V_, -1), used(V_) {}

  void add_edge(int a, int b) {
    G[a].emplace_back(b);
    Gr[b].emplace_back(a);
  }

  // 番号はトポロジカル順
  int operator[](int k) { return comp[k]; }

  void dfs(int idx) {
    if (used[idx]) return;
    used[idx] = true;
    for (int to : G[idx]) dfs(to);
    order.emplace_back(idx);
  }

  void rdfs(int idx, int cnt) {
    if (comp[idx] != -1) return;
    comp[idx] = cnt;
    for (int to : Gr[idx]) rdfs(to, cnt);
  }

  // del_mul が false の場合高速になるが多重辺が生える
  vector<vector<int>> build(bool del_mul = true) {
    vector<vector<int>> res;
    for (int i = 0; i < G.size(); i++) dfs(i);
    reverse(begin(order), end(order));
    int ptr = 0;
    for (int i : order)
      if (comp[i] == -1) rdfs(i, ptr), ptr++;

    res.resize(ptr);
    for (int i = 0; i < G.size(); i++) {
      for (auto &to : G[i]) {
        int x = comp[i], y = comp[to];
        if (x == y) continue;
        res[x].push_back(y);
      }
    }
    if (del_mul) {
      for (auto &&v : res) {
        sort(begin(v), end(v));
        auto itr = unique(begin(v), end(v));
        v.erase(itr, v.end());
      }
    }
    return res;
  }
};

int c[1010][1010];
int dp[1000010] = {};

void solve() {
  int h, w, n;
  cin >> h >> w >> n;
  rep(i, h) rep(j, w) cin >> c[i][j], c[i][j]--;

  SCC scc(h * w);

  auto f = [&](int i, int j) { return i * w + j; };
  rep(i, h - 1) rep(j, w) {
    if (c[i][j] <= c[i + 1][j]) scc.add_edge(f(i, j), f(i + 1, j));
    if (c[i][j] >= c[i + 1][j]) scc.add_edge(f(i + 1, j), f(i, j));
  }
  rep(i, h) rep(j, w - 1) {
    if (c[i][j] <= c[i][j + 1]) scc.add_edge(f(i, j), f(i, j + 1));
    if (c[i][j] >= c[i][j + 1]) scc.add_edge(f(i, j + 1), f(i, j));
  }

  auto G = scc.build(false);

  int m = G.size();
  int Max = 0;
  rep(i, m) {
    chmax(Max, dp[i]);
    for (auto to : G[i]) {
      chmax(dp[to], dp[i] + 1);
    }
  }
  cout << Max + 1 << "\n";
}

int main() { solve(); }

yukicoder

結果

テストケース

ソースコード