Submission #1153610

#	Time	Username	Problem	Language	Result	Execution time	Memory
1153610		fryingduc	CONSUL (info1cup19_consul)	C++20	100 / 100	11 ms	424 KiB

consul

#include "bits/stdc++.h"
#include "grader.h"
using namespace std;

mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
int rand(int l, int r) {
  assert(l <= r);
  return uniform_int_distribution<int> (l, r)(rng);
}

void solve(int n) {
  vector<int> a(n + 1, -1);
  if (n <= 50) {
    for (int i = 1; i <= n; ++i) {
      a[i] = kth(i);
    }
    for (int i = 1; i <= n; ++i) {
      int c = 0;
      for (int j = 1; j <= n; ++j) {
        c += a[j] == a[i];
      }
      if (c > n / 3) {
        say_answer(a[i]);
        return;
      }
    }
    say_answer(-1);
    return;
  }
  for (int ite = 1; ite <= 30; ++ite) {
    int x = rand(1, n);
    while (a[x] != -1) {
      x = rand(1, n);
    }
    a[x] = kth(x);
    int c = cnt(a[x]);
    if (c > n / 3) {
      say_answer(a[x]);
      return;
    }
  }
  say_answer(-1);
}

• Subtask 1: 15 / 15
• Subtask 2: 20 / 20
• Subtask 3: 65 / 65