Submission #989737

#	Time	Username	Problem	Language	Result	Execution time	Memory
989737		tch1cherin	Hedgehog Daniyar and Algorithms (IZhO19_sortbooks)	C++17	0 / 100	372 ms	61552 KiB

sortbooks

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

const int MAX_N = 1000000;
int W[MAX_N], L[MAX_N], R[MAX_N], K[MAX_N], W_val[MAX_N], W_max[MAX_N], W_pref[MAX_N];
bool answer[MAX_N];

void divide(vector<int>& queries, int left, int right) {
  if (right - left == 1) {
    vector<int>().swap(queries);
    for (int i : queries) {
      answer[i] = true;
    }
    return; 
  }
  int mid = (left + right) / 2;
  vector<int> q_left, q_mid, q_right;
  for (int i : queries) {
    if (R[i] < mid) {
      q_left.push_back(i);
    } else if (L[i] >= mid) {
      q_right.push_back(i);
    } else {
      q_mid.push_back(i);
    }
  }
  vector<int>().swap(queries);
  divide(q_left, left, mid);
  divide(q_right, mid, right);
  int current = -1e9, current_inv = 0;
  for (int i = mid - 1; i >= left; i--) {
    if (W[i] > current) {
      current_inv = max(current_inv, current + W[i]);
      current = W[i];
    }
    W_val[i] = current_inv;
    W_max[i] = current;
  }
  current = -1e9, current_inv = 0;
  for (int i = mid; i < right; i++) {
    if (W[i] > current) {
      current = W[i];
    } else {
      current_inv = max(current_inv, current + W[i]);
    }
    W_val[i] = current_inv;
    W_max[i] = current;
  }
  for (int i = mid - 1, j = mid; i >= left; i--) {
    while (j < right && W[j] < W[i]) {
      j++;
    }
    W_pref[i] = j;
  }
  for (int i = mid, j = 0; i < right; i++) {
    while (j < (int)q_mid.size() && R[q_mid[j]] == i) {
      int min_k = max({W_val[i], W_val[L[q_mid[j]]], W[mid] >= W_max[L[q_mid[j]]] ? 0 : W_max[min(W_pref[L[q_mid[j]]] - 1, i)] + W_max[L[q_mid[j]]]});
      answer[q_mid[j]] = min_k <= K[q_mid[j]];
      j++;
    }
  }
}

int main() {
  cin.tie(nullptr)->sync_with_stdio(false);
  int N, M;
  cin >> N >> M;
  for (int i = 0; i < N; i++) {
    cin >> W[i];
  }
  for (int i = 0; i < M; i++) {
    cin >> L[i] >> R[i] >> K[i];
    L[i]--, R[i]--;
  }
  vector<int> queries(M);
  iota(queries.begin(), queries.end(), 0);
  divide(queries, 0, N);
  for (int i = 0; i < M; i++) {
    cout << (int)answer[i] << "\n";
  }
}

• Subtask 1: 0 / 8
• Subtask 2: 0 / 9
• Subtask 3: 0 / 13
• Subtask 4: 0 / 17
• Subtask 5: 0 / 30
• Subtask 6: 0 / 23