Submission #715222

#	Time	Username	Problem	Language	Result	Execution time	Memory
715222		cfjason	Knapsack (NOI18_knapsack)	C++17	100 / 100	111 ms	4864 KiB

knapsack

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
int main(int argc, char *argv[]) {
  ll s, n;
  cin >> s >> n;
  vector<ll> dp(s + 1);
  vector<vector<array<ll, 2>>> itemsByWeight(s + 1);
  for (int i = 0; i < n; i++) {
    ll v, w, k;
    cin >> v >> w >> k;
    itemsByWeight[w].push_back({v, k});
  }
  for (int i = 0; i <= s; i++) {
    sort(itemsByWeight[i].rbegin(), itemsByWeight[i].rend());
  }
  for (int i = 0; i < itemsByWeight.size(); i++) {
    for (int j = s; j >= 0; j--) {
      int cpIndex = j;
      int earnings = 0;
      for (int k = 0; k < itemsByWeight[i].size(); k++) {
        for (int d = 0; d < itemsByWeight[i][k][1]; d++) {
          if (cpIndex - i < 0)
            break;
          cpIndex -= i;
          earnings += itemsByWeight[i][k][0];
          dp[j] = max(dp[j], dp[cpIndex] + earnings);
        }
        if (cpIndex - i < 0)
          break;
      }
    }
  }
  cout << dp[s] << endl;
  return 0;
}

Compilation message (stderr)

knapsack.cpp: In function 'int main(int, char**)':
knapsack.cpp:17:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<std::array<long long int, 2> > >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   17 |   for (int i = 0; i < itemsByWeight.size(); i++) {
      |                   ~~^~~~~~~~~~~~~~~~~~~~~~
knapsack.cpp:21:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::array<long long int, 2> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   21 |       for (int k = 0; k < itemsByWeight[i].size(); k++) {
      |                       ~~^~~~~~~~~~~~~~~~~~~~~~~~~

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