Submission #827325

#	Time	Username	Problem	Language	Result	Execution time	Memory
827325		BERNARB01	Diversity (CEOI21_diversity)	C++17	0 / 100	1 ms	1492 KiB

diversity

/**
 *    author:  BERNARD B.01
**/
#include <bits/stdc++.h>

using namespace std;

#ifdef B01
#include "deb.h"
#else
#define deb(...)
#endif

int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  int n, q;
  cin >> n >> q;
  vector<int> a(n);
  for (int i = 0; i < n; i++) {
    cin >> a[i];
  }
  const int N = (int) 3e5 + 1;
  vector<int> cnt(N);
  for (int i = 0; i < n; i++) {
    cnt[a[i]]++;
  }
  vector<pair<int, int>> freqs;
  for (int i = 0; i < N; i++) {
    if (cnt[i] > 0) {
      freqs.emplace_back(cnt[i], i);
    }
  }
  sort(freqs.rbegin(), freqs.rend());
  deque<int> d;
  for (int i = 0; i < (int) freqs.size(); i++) {
    if (i & 1) {
      d.push_front(freqs[i].second);
    } else {
      d.push_back(freqs[i].first);
    }
  }
  vector<int> pos(n);
  for (int i = 0; i < (int) freqs.size(); i++) {
    pos[freqs[i].second] = i;
  }
  sort(a.begin(), a.end(), [&](int i, int j) {
    return pos[i] < pos[j];
  });
  long long ans = 0;
  for (int i = 0; i < n; i++) {
    if (i == 0 || a[i] != a[i - 1]) {
      ans += (long long) (i + 1) * (n - i);
    } else {
      ans += (n - i);
    }
  }
  while (q--) {
    int l, r;
    cin >> l >> r;
    --l; --r;
    cout << ans << '\n';
  }
  return 0;
}

• Subtask 1: 0 / 4
• Subtask 2: 0 / 10
• Subtask 3: 0 / 8
• Subtask 4: 0 / 16
• Subtask 5: 0 / 26
• Subtask 6: 0 / 36