Submission #1075438

#	Time	Username	Problem	Language	Result	Execution time	Memory
1075438		juicy	Knapsack (NOI18_knapsack)	C++17	100 / 100	48 ms	1884 KiB

knapsack

#include <bits/stdc++.h>

using namespace std;

#ifdef LOCAL
#include "debug.h"
#else
#define debug(...) 42
#endif

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

    int s, n; cin >> s >> n;
    vector<int> dp(s + 1);
    vector<vector<array<int, 2>>> cands(s);
    while (n--) {
        int v, w, k; cin >> v >> w >> k;
        cands[--w].push_back({v, k});
    }
    vector<array<int, 2>> items;
    for (int w = 0; w < s; ++w) {
        sort(cands[w].begin(), cands[w].end());
        int cnt = s / (w + 1);
        while (cands[w].size() && cnt) {
            auto [x, y] = cands[w].back(); cands[w].pop_back();
            int k = min(y, cnt);
            while (k--) {
                --cnt;
                items.push_back({w + 1, x});
            }
        }
    }
    for (auto [w, x] : items) {
        for (int j = s; j >= w; --j) {
            dp[j] = max(dp[j], dp[j - w] + x);
        }
    }
    cout << dp.back();
    return 0;
}

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