답안 #512355

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
512355	2022-01-16T09:55:45 Z	Kaguya	Po (COCI21_po)	C++17	60 / 70	1000 ms	6992 KB

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());
  vector<int> pos[n + 2];
  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;
      int nw = -1;
      int nw1 = -1;
      int nw2 = -1;
      while (i < n && a[i] >= x) {
        if (a[i] > x && nw == -1)
          nw = x;
        if (a[i] > x && a[i] != nw && nw != -1 && nw1 == -1)
          nw1 = x;
        if (a[i] > x && a[i] != nw && a[i] != nw1 && nw != -1 && nw1 != -1 && nw2 == -1)
          nw2 = x;
        if (a[i] == nw) {
          vis[i] = true;
        }
        if (a[i] == nw1)
          vis[i] = true;
        if (a[i] == nw2)
          vis[i] = true;
        if (a[i] < nw1)
          ans += 1;
        if (a[i] < nw2)
          ans += 1;
        if (a[i] < nw) {
          ans += 1;
        }
        if (a[i] == x)
          vis[i] = true;
        i++;
      }
      if (a[i] == x)
        vis[i] = true;
    }
  }
  cout << ans << '\n';
}

Subtask #1

60.0 / 70.0

#	결과	실행 시간	메모리	Grader output
1	Correct	0 ms	204 KB	Output is correct
2	Correct	0 ms	204 KB	Output is correct
3	Correct	1 ms	332 KB	Output is correct
4	Correct	13 ms	2240 KB	Output is correct
5	Correct	16 ms	3148 KB	Output is correct
6	Execution timed out	1093 ms	5188 KB	Time limit exceeded
7	Correct	29 ms	6992 KB	Output is correct