Submission #55218

#	Time	Username	Problem	Language	Result	Execution time	Memory
55218		dfistric	Sailing Race (CEOI12_race)	C++14	40 / 100	438 ms	2952 KiB

race

#include <bits/stdc++.h>

#define FOR(i, a, b) for (int i = (a); i < (b); i++)
#define REP(i, n) FOR(i, 0, n)

using namespace std;

const int MAXN = 510;
vector <int> ve[MAXN];
int num_ways[MAXN][MAXN][2];

bool inside(int x, int y, int z, int t) {
  if (t == 0) swap(x, y);
  if (x < y) {
    return ((z > x) && (z < y));
  }
  return ((z > x) || (z < y));
}

int rek(int x, int y, int t) {
  int& out = num_ways[x][y][t];
  if (out != -1) return out;

  out = 0;
  for (int z : ve[y]) {
    if (!inside(x, y, z, t)) continue;
    //cout << x + 1 << " " << y + 1 << " " << t << " -> " << z + 1 << endl;
    out = max(out, 1 + max(rek(y, z, 1 - t), rek(x, z, t)));
  }
  //cout << x + 1 << " " << y + 1 << " " << t << " --- " << out << endl;
  return out;
}

int main() {
  ios_base::sync_with_stdio(false);
  memset(num_ways, -1, sizeof num_ways);

  int n, k;
  cin >> n >> k;
  REP(i, n) {
    int x;
    cin >> x;
    while (x) {
      ve[i].push_back(x - 1);
      //cout << i << " " << x - 1 << endl;
      cin >> x;
    }
  }

  int out = 0, st = 0;
  REP(i, n) {
    for (int j : ve[i]) {
      int tr = 1 + max(rek(i, j, 1), rek(i, j, 0));
      if (tr > out) {
        out = tr;
        st = i + 1;
      }
      //cout << i + 1 << " " << j + 1 << ": " << rek(i, j, 0) << " " << rek(i, j, 1) << endl;
    }
  }
cout << out << "\n" << st << "\n";

  return 0;
}

• Subtask 1: 40 / 100