Submission #512338

#	Time	Username	Problem	Language	Result	Execution time	Memory
512338		Kaguya	Po (COCI21_po)	C++17	60 / 70	1095 ms	12360 KiB

Main

#include <bits/stdc++.h>
using namespace std;

#pragma GCC optimize("-O3")
#pragma GCC optimize("-Ofast")

int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  int n;
  cin >> n;
  vector<int> a(n);
  bool have = false;
  for (auto& t : a) {
    cin >> t;
    if (t == 0)
      have = true;
  }
  vector<int> ve;
  for (int i = 0; i < n; i++)
    ve.push_back(a[i]);
  sort(ve.begin(), ve.end());
  ve.resize(unique(ve.begin(), ve.end()) - ve.begin());
  for (int i = 0; i < n; i++) {
    a[i] = lower_bound(ve.begin(), ve.end(), a[i]) - ve.begin();
  }
  int ans = 0;
  vector<int> se;
  vector<bool> vis(n, false);
  vector<bool> was(n + 11, false);
  for (int i = 0; i < n; i++)
    if (!was[a[i]]) {
      se.push_back(a[i]);
      was[a[i]] = true;
    }
  sort(se.rbegin(), se.rend());
  map<int, vector<int>> pos;
  for (int i = 0; i < n; i++)
    pos[a[i]].push_back(i);
  if (!have) {
    ans += 1;
    se.pop_back();
  }
  for (int i = 0; i < n; i++)
    if (have && a[i] == 0)
      vis[i] = true;
  if (have && se.back() == 0)
    se.pop_back();
  while (!se.empty()) {
    int x = se.back();
    se.pop_back();
    for (auto t : pos[x]) {
      if (vis[t])
        continue;
      vis[t] = true;
      int i = t;
      ans += 1;
      while (i < n && a[i] >= x) {
        if (a[i] == x)
          vis[i] = true;
        i++;
      }
      if (a[i] == x)
        vis[i] = true;
    }
  }
  cout << ans << '\n';
}

• Subtask 1: 60 / 70