Submission #577148

#	Time	Username	Problem	Language	Result	Execution time	Memory
577148		MilosMilutinovic	Studentsko (COCI14_studentsko)	C++14	100 / 100	3 ms	468 KiB

studentsko

#include <bits/stdc++.h>

using namespace std;

template <typename T>
class fenwick {
  public:
  vector<T> fenw;
  int n;
  fenwick(int _n) : n(_n) {
    fenw.resize(n);
  }
  void modify(int x, T v) {
    while (x < n) {
      fenw[x] += v;
      x |= (x + 1);
    }
  }
  T get(int x) {
    T v{};
    while (x >= 0) {
      v += fenw[x];
      x = (x & (x + 1)) - 1;
    }
    return v;
  }
};
struct node {
  int a = 0; // don't forget to set default value
  inline void operator += (node &other) {
    a = max(a, other.a);
  }
};

int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  int n, k;
  cin >> n >> k;
  vector<int> a(n);
  for (int i = 0; i < n; i++) {
    cin >> a[i];
  }
  vector<int> order(n);
  iota(order.begin(), order.end(), 0);
  sort(order.begin(), order.end(), [&](int i, int j) {
    return a[i] > a[j];
  });
  vector<int> id(n);
  for (int i = 0; i < n; i++) {
    id[order[i]] = i / k;
  }
  sort(order.begin(), order.end(), [&](int i, int j) {
    if (id[i] == id[j]) {
      return i < j;
    } else {
      return a[i] < a[j];
    }
  });
  for (int i = 0; i < n; i++) {
    id[order[i]] = i;
  }
  fenwick<node> fenw(n);
  vector<int> dp(n);
  for (int i = 0; i < n; i++) {
    dp[i] = fenw.get(id[i]).a + 1;
    fenw.modify(id[i], {dp[i]});
  }
  cout << n - *max_element(dp.begin(), dp.end()) << '\n';
  return 0;
}

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 10 / 10
• Subtask 5: 10 / 10
• Subtask 6: 10 / 10
• Subtask 7: 10 / 10
• Subtask 8: 10 / 10
• Subtask 9: 10 / 10
• Subtask 10: 10 / 10