Submission #261635

#	Time	Username	Problem	Language	Result	Execution time	Memory
261635		sandoval	Cave (IOI13_cave)	C++11	21 / 100	392 ms	648 KiB

cave

#include "cave.h"
#include <bits/stdc++.h>

using namespace std;
using ll = long long;

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

inline int rnd(int l, int r) {return uniform_int_distribution<>(l,r)(rng);}

constexpr int MAXN = 5002;
int a[MAXN], comb[MAXN], ass[MAXN];

/*int printq(const vector<int>& x) {
  cout << "?";
  for (auto q : x) cout << ' ' << q;
  cout << endl;
  int p; cin >> p;
  return p;
}*/

int ask(const vector<int>& p) {
  for (int i = 0; i < (int)p.size(); ++i) a[i] = p[i];
  //return printq(p);
  return tryCombination(a);
}

void solve(vector<int> v, vector<int>& sol) {
  if (v.empty()) return;
  int ans = ask(sol);
  if (ans == -1) return;

  while (!v.empty()) {
    int idx = rnd(0, (int)v.size()-1);
    int x = v[idx];
    sol[x] ^= 1;
    int r = ask(sol);
    if (r == -1) return;
    sol[x] ^= 1;

    if (r > ans) {
      sol[x] ^= 1;
      ans = r;
      v.erase(v.begin()+idx);
    } else if (r == ans) {
      continue;
    } else if (r < ans) {
      v.erase(v.begin()+idx);
    }
  }
}

void exploreCave(int N) {
  vector<int> p(N), v;
  for (auto& x : p) x = rnd(0,1);
  for (int i = 0; i < N; ++i) v.push_back(i);
  shuffle(v.begin(), v.end(), rng);
  solve(v, p);

  assert(ask(p) == -1);
  for (int i = 0; i < N; ++i) comb[i] = p[i];

  for (int i = 0; i < N; ++i) {
    p[i] ^= 1;
    ass[i] = ask(p);
    p[i] ^= 1;
  }
  answer(comb, ass);
  /*for (int i = 0; i < N; ++i) cout << comb[i] << ' ';
  cout << endl;
  for (int i = 0; i < N; ++i) cout << ass[i] << ' ';
  cout << endl;*/
}

• Subtask 1: 0 / 12
• Subtask 2: 0 / 13
• Subtask 3: 21 / 21
• Subtask 4: 0 / 30
• Subtask 5: 0 / 24