Submission #750445

#	Time	Username	Problem	Language	Result	Execution time	Memory
750445		nguyennehehe	Knapsack (NOI18_knapsack)	C++14	100 / 100	57 ms	3864 KiB

knapsack

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

signed main() {
  cin.tie(nullptr)->sync_with_stdio(false);

  int s, n; cin >> s >> n;
  vector<vector<pair<int, int>>> items(s + 1);
  for (int i = 0; i < n; ++i) {
    int v, w, k; cin >> v >> w >> k;
    items[w].emplace_back(v, k);
  }

  vector<pair<int, int>> a;
  for (int w = 1; w <= s; ++w) {
    sort(items[w].begin(), items[w].end(), greater<>());
    int cnt = s / w;
    for (pair<int, int> p: items[w]) {
      int bound = min(p.second, cnt);
      for (int i = 1; i <= bound; ++i) {
        a.emplace_back(w, p.first);
      }
      cnt -= bound;
      if (cnt == 0) break;
    }
  }

  vector<long long> dp(s + 1);
  for (pair<int, int> p: a) {
    for (int w = s; w >= p.first; --w) {
      dp[w] = max(dp[w], dp[w - p.first] + p.second);
    }
  }

  cout << *max_element(dp.begin(), dp.end());
}

• Subtask 1: 12 / 12
• Subtask 2: 17 / 17
• Subtask 3: 20 / 20
• Subtask 4: 24 / 24
• Subtask 5: 27 / 27