Submission #844747

#	Time	Username	Problem	Language	Result	Execution time	Memory
844747		qrno	Knapsack (NOI18_knapsack)	C++17	17 / 100	1 ms	388 KiB

knapsack

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

#define int long long

int S, N;
vector<int> V, W;

signed main() {
  ios::sync_with_stdio(false); cin.tie(nullptr);

  cin >> S >> N;
  for (int i = 0; i < N; i++) {
    int v, w, k;
    cin >> v >> w >> k;
    int cnt = 1;
    for (; cnt <= k; cnt *= 2) {
      V.push_back(v * cnt);
      W.push_back(w * cnt);
    }
    if (k & (k+1)) {
      cnt = k - cnt/2;
      V.push_back(v * cnt);
      W.push_back(w * cnt);
    }
  }

  vector<int> most(S+1);
  for (int i = 0; i < size(V); i++) {
    for (int s = S; s-W[i] >= 0; s--) {
      most[s] = max(most[s], most[s-W[i]] + V[i]);
    }
  }

  cout << *max_element(begin(most), end(most)) << endl;
}

Compilation message (stderr)

knapsack.cpp: In function 'int main()':
knapsack.cpp:29:21: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   29 |   for (int i = 0; i < size(V); i++) {
      |                   ~~^~~~~~~~~

• Subtask 1: 0 / 12
• Subtask 2: 17 / 17
• Subtask 3: 0 / 20
• Subtask 4: 0 / 24
• Subtask 5: 0 / 27