Submission #507538

#	Time	Username	Problem	Language	Result	Execution time	Memory
507538		Saeed_247	Knapsack (NOI18_knapsack)	C++14	100 / 100	94 ms	33152 KiB

knapsack

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

int main() {
    ios::sync_with_stdio(false); cin.tie(0); cout.tie(0);
    int s, n;
    cin >> s >> n;
    map<int, vector<pair<int, int>>> mp;
    for (int i = 1; i <= n; i++) {
        int v, w, a;
        cin >> v >> w >> a;
        if (w <= s && a > 0) {
            mp[w].push_back({v, a});
        }
    }
    vector<vector<long long>> dp(mp.size() + 1, vector<long long>(s + 1, INT_MIN));
    dp[0][0] = 0;
    int i = 1;
    for (auto& [w, items] : mp) {
        sort(items.begin(), items.end(), greater<pair<int, int>>());
        for (int j = 0; j <= s; j++) {
            dp[i][j] = dp[i - 1][j];
            int amt = 0, curr = 0, used = 0;
            long long x = 0;
            while ((amt + 1) * w <= j && curr < items.size()) {
                amt++;
                x += items[curr].first;
                if (dp[i - 1][j - amt * w] != INT_MIN) {
                    dp[i][j] = max(dp[i][j], dp[i - 1][j - amt * w] + x);
                }
                used++;
                if (used == items[curr].second) {
                    used = 0;
                    curr++;
                }
            }
        }
        i++;
    }
    cout << *max_element(dp.back().begin(), dp.back().end()) << '\n';
    return 0;
}

Compilation message (stderr)

knapsack.cpp: In function 'int main()':
knapsack.cpp:19:16: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   19 |     for (auto& [w, items] : mp) {
      |                ^
knapsack.cpp:25:47: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   25 |             while ((amt + 1) * w <= j && curr < items.size()) {
      |                                          ~~~~~^~~~~~~~~~~~~~

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