제출 #604616

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
604616		Plurm	Uplifting Excursion (BOI22_vault)	C++11	5 / 100	5050 ms	12456 KiB

vault

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

template <typename T> class negarr {
private:
  T data[505000 * 2 + 1];

public:
  negarr() { memset(data, 0, sizeof(data)); }
  void reset() { fill(data, data + 505000 * 2 + 1, -1000000000); }
  inline T &operator[](int i) { return data[i + 505000]; }
};

class pstate {
public:
  int x, y;
  pstate(int x, int y) : x(x), y(y) {}
  friend bool operator<(const pstate &a, const pstate &b) {
    return a.x + a.y < b.x + b.y;
  }
};
class nstate {
public:
  int x, y;
  nstate(int x, int y) : x(x), y(y) {}
  friend bool operator<(const nstate &a, const nstate &b) {
    return a.y - a.x < b.y - b.x;
  }
};
negarr<int> a, knapsack;
int main() {
  int m;
  long long l;
  cin >> m >> l;
  const int BOUND = m * (m + 1) / 2 * 100;
  if (l > BOUND || l < -BOUND) {
    printf("impossible\n");
    return 0;
  }
  knapsack.reset();
  knapsack[0] = 0;
  for (int i = -m; i <= m; i++) {
    cin >> a[i];
    negarr<int> tmp;
    tmp.reset();
    if (i == 0) {
      for (int id = -BOUND; id <= BOUND; id++) {
        knapsack[id] += a[i];
      }
    } else {
      if (i > 0) {
        vector<priority_queue<nstate>> pq(i);
        for (int id = -BOUND; id <= BOUND; id++) {
          int mod = id % i;
          if (mod < 0)
            mod += i;
          int xx = (id + BOUND) / i;
          while (!pq[mod].empty() && xx - pq[mod].top().x > a[i])
            pq[mod].pop();
          while (!pq[mod].empty() && pq[mod].top() < nstate(xx, knapsack[id]))
            pq[mod].pop();
          pq[mod].push({xx, knapsack[id]});
          if (!pq[mod].empty()) {
            nstate t = pq[mod].top();
            tmp[id] = max(tmp[id], t.y - t.x + xx);
          }
        }
      } else if (i < 0) {
        vector<priority_queue<pstate>> pq(-i);
        for (int id = BOUND; id >= -BOUND; id--) {
          int mod = id % (-i);
          if (mod < 0)
            mod += (-i);
          int xx = (id + BOUND) / (-i);
          while (!pq[mod].empty() && pq[mod].top().x - xx > a[i])
            pq[mod].pop();
          while (!pq[mod].empty() && pq[mod].top() < pstate(xx, knapsack[id]))
            pq[mod].pop();
          pq[mod].push({xx, knapsack[id]});
          if (!pq[mod].empty()) {
            pstate t = pq[mod].top();
            knapsack[id] = max(knapsack[id], t.y + t.x - xx);
          }
        }
      }
      for (int id = -BOUND; id <= BOUND; id++) {
        knapsack[id] = max(knapsack[id], tmp[id]);
      }
    }
  }
  if (knapsack[l] >= 0)
    printf("%d\n", knapsack[l]);
  else
    printf("impossible\n");
  return 0;
}

• Subtask 1: 5 / 5
• Subtask 2: 0 / 15
• Subtask 3-1: 0 / 10
• Subtask 3-2: 0 / 10
• Subtask 4-1: 0 / 10
• Subtask 4-2: 0 / 10
• Subtask 5-1: 0 / 10
• Subtask 5-2: 0 / 10
• Subtask 6-1: 0 / 10
• Subtask 6-2: 0 / 10