Submission #585125

#	Time	Username	Problem	Language	Result	Execution time	Memory
585125		Pety	medians (balkan11_medians)	C++14	100 / 100	96 ms	13004 KiB

medians

#include <bits/stdc++.h>
#define ll long long

using namespace std;

const int INF = 1e9;
const int MOD = 1e9 + 7;

int n, a[100002], b[200002], viz[200002];
set<int>s;

int main () 
{
  ios_base::sync_with_stdio(false);
  cin.tie(0); cout.tie(0);
  cin >> n;
  for (int i = 1; i <= n; i++)
    cin >> a[i];
  viz[a[1]] = 1;
  for (int i = 1; i < 2 * n; i++)
    s.insert(i);
  s.erase(a[1]);
  b[1] = a[1];

  for (int i = 2; i <= n; i++) {
    if (a[i] == a[i - 1]) {
      b[2 * i - 1] = *s.begin();
      b[2 * i - 2] = *prev(s.end());
    
      s.erase(b[2 * i - 1]);
      s.erase(b[2 * i - 2]);
      viz[b[2 * i - 2]] = 1;
      viz[b[2 * i - 1]] = 1;
    }
    else if (a[i] > a[i - 1]) {
      b[2 * i - 1] = *prev(s.end());
      s.erase(*prev(s.end()));
      if (viz[a[i]]) 
        b[2 * i - 2] = *prev(s.end());
      else
        b[2 * i - 2] = a[i];
      s.erase(b[2 * i - 2]);
      viz[b[2 * i - 2]] = 1;
      viz[b[2 * i - 1]] = 1;
    }
    else {
      b[2 * i - 1] = *s.begin();
      auto it = s.begin();
      if (viz[a[i]]) {
        it++;
        b[2 * i - 2] = *it;
      }
      else
        b[2 * i - 2] = a[i];
      s.erase(b[2 * i - 1]);
      s.erase(b[2 * i - 2]);
      viz[b[2 * i - 2]] = 1;
      viz[b[2 * i - 1]] = 1;
    }

  }
  for (int i = 1; i < 2 * n; i++)
    cout << b[i] << " ";
  return 0;
}

• Subtask 1: 65 / 65
• Subtask 2: 35 / 35