Submission #261669

#	Time	Username	Problem	Language	Result	Execution time	Memory
261669		sandoval	Cave (IOI13_cave)	C++11	34 / 100	81 ms	33036 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 q = 0;
int printq(const vector<int>& x) {
  /*cout << "?";
  for (auto q : x) cout << ' ' << q;
  cout << endl;
  int p; cin >> p;
  return p;*/
  ++q;
  for (int i = 0; i < (int)x.size(); ++i) if (x[i] == 0) return i;
  return -1;
}

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

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

  vector<int> ri = v;
  for (auto x : v) {
    sol[x] ^= 1;
    int r = ask(sol);
    if (r == -1) return;
    sol[x] ^= 1;

    if (r > ans) {
      ass[x] = ans;
      sol[x] ^= 1;
      ri.erase(find(ri.begin(), ri.end(), x));
      solve(ri, sol);
      return;
    } else if (r == ans) {
      sol[x] ^= rnd(0,1);
    } else {
      ri.erase(find(ri.begin(), ri.end(), x));
      ass[x] = r;
    }
  }
}

void exploreCave(int N) {
  vector<int> p(N,0), v;
  for (int i = 0; i < N; ++i) v.push_back(i), ass[i] = -1;
  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) {
    if (ass[i] == -1) {
      p[i] ^= 1;
      ass[i] = ask(p);
      p[i] ^= 1;
    }
  }
  answer(comb, ass);
  return;
  for (int i = 0; i < N; ++i) cout << comb[i] << ' ';
  cout << endl;
  for (int i = 0; i < N; ++i) cout << ass[i] << ' ';
  cout << endl;
  cout << q << endl;
}

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