Submission #588428

#	Time	Username	Problem	Language	Result	Execution time	Memory
588428		lorenzoferrari	Boxes with souvenirs (IOI15_boxes)	C++17	50 / 100	2054 ms	27880 KiB

boxes

#include "boxes.h"
#include <bits/stdc++.h>
using namespace std;
using LL = long long;

vector<LL> linear_cost(int n, int k, const vector<int>& p) {
  vector<LL> ans(n+1); ans[0] = 0;
  for (int i = 1; i <= n; ++i) {
    ans[i] = 2 * p[i-1] + ans[max(0, i - k)];
  }
  return ans;
}

LL delivery(int n, int k, int l, int p[]) {
  vector<int> v; v.reserve(n);
  for (int i = 0; i < n; ++i) if (p[i]) v.push_back(p[i]);
  n = int(v.size());
  auto ca = linear_cost(n, k, v);
  auto rv = v;
  for (int& i : rv) i = l - i;
  reverse(rv.begin(), rv.end());
  auto cb = linear_cost(n, k, rv);
  LL ans = 1e18;
  for (int i = 0; i <= n; ++i) {
    ans = min(ans, ca[i] + cb[n - i]);
  }
  for (int a = 0; a < n; ++a) {
    for (int b = a; b < n && b - a < k; ++b) {
      ans = min(ans, l + ca[a] + cb[n - b - 1]);
    }
  }
  return ans;
}

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 15 / 15
• Subtask 4: 15 / 15
• Subtask 5: 0 / 20
• Subtask 6: 0 / 30