Submission #1063195

#	Time	Username	Problem	Language	Result	Execution time	Memory
1063195		Boas	Tropical Garden (IOI11_garden)	C++17	0 / 100	1 ms	604 KiB

garden

#include "gardenlib.h"
#include <bits/stdc++.h>
using namespace std;
typedef pair<int, int> ii;
typedef tuple<int, int, int> iii;
typedef vector<int> vi;
typedef vector<bool> vb;
typedef vector<ii> vii;
typedef vector<vi> vvi;
typedef vector<vb> vvb;
typedef vector<vii> vvii;
#define loop(x, i) for (int i = 0; i < x; i++)
#define pb push_back

void count_routes(int N, int M, int P, int R[][2], int Q, int G[])
{
  vvii adj(N);
  loop(M, i)
  {
    adj[R[i][0]].pb({i, R[i][1]});
    adj[R[i][1]].pb({i, R[i][0]});
  }
  vvi p(30, vi(N));
  vvb otherOption(30, vb(N));
  loop(N, i)
  {
    auto [ix, j] = adj[i][0];
    p[0][i] = j;
    if (adj[j].size() > 1 && adj[j][0] == ii{ix, i})
      otherOption[0][i] = 1;
  }
  typedef pair<int, bool> ib;
  typedef tuple<int, int, bool> iib;
  map<iib, ib> dp;
  auto nthParent = [&](auto &&self, int i, int n, bool othOption) -> ib
  {
    iib input = {i, n, othOption};
    if (dp.count(input))
      return dp[input];
    loop(30, x)
    {
      if ((1 << x) & n)
      {
        if (othOption && adj[i].size() > 1)
        {
          auto [ix, j] = adj[i][1];
          othOption = 0;
          auto [newI, newOthOption] = self(self, j, (1 << x) - 1, adj[j][0].first == ix);
          i = newI;
          othOption = newOthOption;
        }
        else
        {
          i = p[x][i];
          if (otherOption[x][i])
            othOption = 1;
        }
      }
    }
    return dp[input] = {i, othOption};
  };
  for (int x = 1; x < 30; x++)
  {
    loop(N, i)
    {
      int half = p[x - 1][i];
      bool opt2 = otherOption[x - 1][i];
      /*if (otherOption[x - 1][i] && adj[i].size() > 1)
      {
        auto [halfN, opt2N] = nthParent(nthParent, adj[i][1].second, (1 << (x - 1)) - 1);
        half = halfN;
        opt2 = opt2N;
      }*/
      int nieuw = p[x - 1][half];
      otherOption[x][i] = otherOption[x - 1][half];
      if (opt2 && adj[half].size() > 1)
      {
        auto [ix, j] = adj[half][1];
        auto [nieuwN, opt2N] = nthParent(nthParent, j, (1 << (x - 1)) - 1, adj[j][0].first == ix);
        nieuw = nieuwN;
        otherOption[x][i] = opt2N;
      }
      p[x][i] = nieuw;
    }
  }
  for (int i = 0; i < Q; i++)
  {
    int K = G[i];
    int cnt = 0;
    loop(N, start)
    {
      if (nthParent(nthParent, start, K, 0).first == P)
        cnt++;
    }
    answer(cnt);
  }
}

• Subtask 1: 0 / 49
• Subtask 2: 0 / 20
• Subtask 3: 0 / 31