結果

問題 No.497 入れ子の箱
ユーザー penguinshunya
提出日時 2020-01-28 10:56:38
言語 C++14
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 58 ms / 5,000 ms
コード長 3,477 bytes
コンパイル時間 1,749 ms
コンパイル使用メモリ 173,988 KB
実行使用メモリ 5,376 KB
最終ジャッジ日時 2024-09-15 07:54:42
合計ジャッジ時間 4,279 ms
ジャッジサーバーID
（参考情報） 		judge4 / judge3
このコードへのチャレンジ
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ファイルパターン 結果
sample AC * 3
other AC * 29
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

diff #
プレゼンテーションモードにする

#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < int(n); i++)
#define rrep(i, n) for (int i = int(n) - 1; i >= 0; i--)
#define reps(i, n) for (int i = 1; i <= int(n); i++)
#define rreps(i, n) for (int i = int(n); i >= 1; i--)
#define repc(i, n) for (int i = 0; i <= int(n); i++)
#define rrepc(i, n) for (int i = int(n); i >= 0; i--)
#define repi(i, a, b) for (int i = int(a); i < int(b); i++)
#define repic(i, a, b) for (int i = int(a); i <= int(b); i++)
#define each(x, y) for (auto &x : y)
#define all(a) (a).begin(), (a).end()
#define bit(b) (1ll << (b))
using namespace std;
using i32 = int;
using i64 = long long;
using u64 = unsigned long long;
using f80 = long double;
using vi32 = vector<i32>;
using vi64 = vector<i64>;
using vu64 = vector<u64>;
using vf80 = vector<f80>;
using vstr = vector<string>;
inline void yes() { cout << "Yes" << '\n'; exit(0); }
inline void no() { cout << "No" << '\n'; exit(0); }
inline i64 gcd(i64 a, i64 b) { if (min(a, b) == 0) return max(a, b); if (a % b == 0) return b; return gcd(b, a % b); }
inline i64 lcm(i64 a, i64 b) { return a / gcd(a, b) * b; }
inline u64 xorshift() { static u64 x = 88172645463325252ull; x = x ^ (x << 7); return x = x ^ (x >> 9); }
template <typename T> class pqasc : public priority_queue<T, vector<T>, greater<T>> {};
template <typename T> class pqdesc : public priority_queue<T, vector<T>, less<T>> {};
template <typename T> inline void amax(T &x, T y) { if (x < y) x = y; }
template <typename T> inline void amin(T &x, T y) { if (x > y) x = y; }
template <typename T> inline T exp(T x, i64 n, T e = 1) { T r = e; while (n > 0) { if (n & 1) r *= x; x *= x; n >>= 1; } return r; }
template <typename T> inline T bis(T ok, T ng, function<bool(T)> f, T eps = 1) { while (abs(ok - ng) > eps) { T mi = (ok + ng) / 2; (f(mi) ? ok : ng) 
    = mi; } return ok; }
template <typename T> istream& operator>>(istream &is, vector<T> &v) { each(x, v) is >> x; return is; }
template <typename T> ostream& operator<<(ostream &os, vector<T> &v) { rep(i, v.size()) { if (i) os << ' '; os << v[i]; } return os; }
template <typename T, typename S> istream& operator>>(istream &is, pair<T, S> &p) { is >> p.first >> p.second; return is; }
template <typename T, typename S> ostream& operator<<(ostream &os, pair<T, S> &p) { os << p.first << ' ' << p.second; return os; }
void solve(); int main() { ios::sync_with_stdio(0); cin.tie(0); cout << fixed << setprecision(16); solve(); return 0; }
struct Cube {
  vi32 v;
  bool operator<(const Cube &that) const {
    #define lt(x) if (x != that.x) return x < that.x;
    #define gt(x) if (x != that.x) return x > that.x;
    #undef gt
    #undef lt
    return false;
  }
  bool operator>(const Cube &that) const {
    return that < *this;
  }
};
void solve() {
  int n;
  cin >> n;
  vector<Cube> cubes(n);
  rep(i, n) {
    int x, y, z;
    cin >> x >> y >> z;
    cubes[i].v = {x, y, z};
  }
  vi32 dp(n, -1);
  function<int(int)> rec = [&](int x) {
    if (dp[x] != -1) return dp[x];
    int ret = 0;
    rep(i, n) {
      if (i == x) continue;
      vi32 ord(3);
      iota(all(ord), 0);
      do {
        if (cubes[x].v[0] > cubes[i].v[ord[0]] && 
            cubes[x].v[1] > cubes[i].v[ord[1]] &&
            cubes[x].v[2] > cubes[i].v[ord[2]]) {
          amax(ret, rec(i) + 1);
          break;
        }
      } while (next_permutation(all(ord)));
    }
    return dp[x] = ret;
  };
  int ans = 0;
  rep(i, n) amax(ans, rec(i) + 1);
  cout << ans << endl;
}
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