Submission #316099

#	Time	Username	Problem	Language	Result	Execution time	Memory
316099		MrDomino	The Big Prize (IOI17_prize)	C++14	20 / 100	66 ms	376 KiB

prize

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

using namespace std;

mt19937 rng((long long) (new char));

int rn(int l, int r) {
  return l + rng() % (r - l + 1);
}

int cnt;

int rep(int l, int r, int q) {
  assert(q >= 0);
  if (l > r || q == 0) {
    return 0;
  }
  int i = rn(l, r);
  vector<int> v = ask(i); cnt++;
  q--;
  if (v[0] == 0 && v[1] == 0) {
    return i;
  }
  if (v[0] == 0) {
    return rep(i + 1, r, q);
  }
  if (v[1] == 0) {
    return rep(l, i - 1, q);
  }
  /// cnt(0) / cnt(1) = v[0] / v[1]
  /// cnt(0) + cnt(1) = q
  int c0 = (long long) v[0] * q / (v[0] + v[1]);
  int c1 = q - c0;
  int x = rep(l, i - 1, c0);
  if (x) {
    return x;
  } else {
    return rep(i + 1, r, c1);
  }
}

int find_best(int n) {
  return rep(0, n - 1, 9000 + 1000 - 8);
}

• Subtask 1: 20 / 20
• Subtask 2: 0 / 80