結果

問題 No.2639 Longest Increasing Walk
ユーザー miscalc
提出日時 2024-02-19 21:51:38
言語 C++17
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 131 ms / 2,000 ms
コード長 3,270 bytes
コンパイル時間 4,215 ms
コンパイル使用メモリ 254,832 KB
最終ジャッジ日時 2025-02-19 16:53:37
ジャッジサーバーID
（参考情報） 		judge5 / judge2
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ファイルパターン 結果
other AC * 33
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ソースコード

diff #
プレゼンテーションモードにする

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using ld = long double;
using ull = unsigned long long;
using pll = pair<ll, ll>;
using tlll = tuple<ll, ll, ll>;
constexpr ll INF = 1LL << 60;
template<class T> bool chmin(T& a, T b) {if (a > b) {a = b; return true;} return false;}
template<class T> bool chmax(T& a, T b) {if (a < b) {a = b; return true;} return false;}
ll safemod(ll A, ll M) {ll res = A % M; if (res < 0) res += M; return res;}
ll divfloor(ll A, ll B) {if (B < 0) A = -A, B = -B; return (A - safemod(A, B)) / B;}
ll divceil(ll A, ll B) {if (B < 0) A = -A, B = -B; return divfloor(A + B - 1, B);}
ll pow_ll(ll A, ll B) {if (A == 0 || A == 1) {return A;} if (A == -1) {return B & 1 ? -1 : 1;} ll res = 1; for (int i = 0; i < B; i++) {res *= A;} 
    return res;}
ll mul_limited(ll A, ll B, ll M = INF) { return B == 0 ? 0 : A > M / B ? M : A * B; }
ll pow_limited(ll A, ll B, ll M = INF) { if (A == 0 || A == 1) {return A;} ll res = 1; for (int i = 0; i < B; i++) {if (res > M / A) return M; res *= 
    A;} return res;}
template<class T> void unique(vector<T> &V) {V.erase(unique(V.begin(), V.end()), V.end());}
template<class T> void sortunique(vector<T> &V) {sort(V.begin(), V.end()); V.erase(unique(V.begin(), V.end()), V.end());}
#define FINALANS(A) do {cout << (A) << '\n'; exit(0);} while (false)
//*
#include <atcoder/all>
using namespace atcoder;
template <class T, internal::is_static_modint_t<T> * = nullptr>
istream &operator>>(istream &is, T &a) { ll v; is >> v; a = v; return is; }
template <class T, internal::is_dynamic_modint_t<T> * = nullptr>
istream &operator>>(istream &is, T &a) { ll v; is >> v; a = v; return is; }
template <class T, internal::is_static_modint_t<T> * = nullptr>
ostream &operator<<(ostream &os, const T &a) { os << a.val(); return os; }
template <class T, internal::is_dynamic_modint_t<T> * = nullptr>
ostream &operator<<(ostream &os, const T &a) { os << a.val(); return os; }
using mint = modint998244353;
//using mint = modint1000000007;
//using mint = modint;
//*/
template<class T> void printvec(const vector<T> &V) {int _n = V.size(); for (int i = 0; i < _n; i++) cout << V[i] << (i == _n - 1 ? "" : " "); cout << 
    '\n';}
template<class T> void printvect(const vector<T> &V) {for (auto v : V) cout << v << '\n';}
template<class T> void printvec2(const vector<vector<T>> &V) {for (auto &v : V) printvec(v);}
int main()
{
  ll H, W;
  cin >> H >> W;
  vector<vector<ll>> A(H, vector<ll>(W));
  for (ll i = 0; i < H; i++)
  {
    for (ll j = 0; j < W; j++)
    {
      cin >> A.at(i).at(j);
    }
  }
  const vector<pll> dij = {{1, 0}, {0, 1}, {-1, 0}, {0, -1}};
  vector<vector<ll>> dp(H, vector<ll>(W, -INF));
  auto calc = [&](auto self, ll i, ll j) -> ll
  {
    if (dp.at(i).at(j) != -INF)
      return dp.at(i).at(j);
    dp.at(i).at(j) = 0;
    for (auto [di, dj] : dij)
    {
      ll ni = i + di, nj = j + dj;
      if (!(0 <= ni && ni < H && 0 <= nj && nj < W))
        continue;
      if (A.at(ni).at(nj) < A.at(i).at(j))
      {
        chmax(dp.at(i).at(j), self(self, ni, nj) + 1);
      }
    }
    return dp.at(i).at(j);
  };
  ll ans = 0;
  for (ll i = 0; i < H; i++)
  {
    for (ll j = 0; j < W; j++)
    {
      chmax(ans, calc(calc, i, j));
    }
  }
  cout << ans + 1 << endl;
}
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