Submission #341660

#	Time	Username	Problem	Language	Result	Execution time	Memory
341660		xiaowuc1	medians (balkan11_medians)	C++17	95 / 100	77 ms	21484 KiB

medians

#include <algorithm>
#include <array>
#include <bitset>
#include <cassert>
#include <chrono>
#include <cstring>
#include <iomanip>
#include <iostream>
#include <map>
#include <numeric>
#include <queue>
#include <random>
#include <set>
#include <stack>
#include <vector>

using namespace std;

// BEGIN NO SAD
#define rep(i, a, b) for(int i = a; i < (b); ++i)
#define trav(a, x) for(auto& a : x)
#define all(x) x.begin(), x.end()
#define sz(x) (int)(x).size()
#define mp make_pair
#define pb push_back
#define eb emplace_back
#define lb lower_bound
#define ub upper_bound
typedef vector<int> vi;
#define f first
#define s second
// END NO SAD

typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<vector<ll>> matrix;

const int SZ = 1 << 17;
int tree[2 * SZ];
void upd(int idx) {
  idx += SZ;
  while(idx) {
    tree[idx]++;
    idx /= 2;
  }
}
int qry(int lhs, int rhs) {
  int ret = 0;
  lhs += SZ;
  rhs += SZ;
  while(lhs <= rhs) {
    if(lhs%2) ret += tree[lhs++];
    if(rhs%2==0) ret += tree[rhs--];
    lhs /= 2;
    rhs /= 2;
  }
  return ret;
}

void solve() {
  int n;
  cin >> n;
  set<int> s;
  for(int i = 1; i < 2*n; i++) s.insert(i);
  vector<int> ret;
  for(int a = 1; a <= n; a++) {
    int x;
    cin >> x;
    if(s.count(x)) {
      ret.pb(x); upd(ret.back()); s.erase(ret.back());
    }
    while(qry(1, x-1) < a-1) {
      ret.pb(*s.begin()); upd(ret.back()); s.erase(ret.back());
    }
    while(sz(ret) < 2*a-1) {
      ret.pb(*s.rbegin()); upd(ret.back()); s.erase(ret.back());
    }
  }
  for(int i = 0; i < sz(ret); i++) cout << ret[i] << " \n"[i == sz(ret)-1];
}

// !editcommand?
// are there edge cases (N=1?)
// are array sizes proper (scaled by proper constant, for example 2* for koosaga tree)
// integer overflow?
// DS reset properly between test cases
// are you doing geometry in floating points
// are you not using modint when you should

int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL); cout.tie(NULL);
  solve();
}

• Subtask 1: 65 / 65
• Subtask 2: 30 / 35