Submission #680154

#	Time	Username	Problem	Language	Result	Execution time	Memory
680154		Wobert	Knapsack (NOI18_knapsack)	C++17	100 / 100	114 ms	3988 KiB

knapsack

#include "bits/stdc++.h"

#define fox(i, n) for (int i = 0; i < n; ++i)
#define rep(i, a, b) for (int i = a; i <= b; ++i)
#define pb push_back
#define eb emplace_back
#define tomax(a, b) ((a) = max((a), (b)))
#define tomin(a, b) ((a) = min((a), (b)))
#define F first
#define S second

using namespace std;

typedef long long ll;
typedef pair<int, int> pii;
typedef vector<int> vi;

const int MAXW = 2005, MEMSET_INF = 127;

int n, s;
vector<pii> items[MAXW]; // {value, copies}
vector<pii> e; // {value, weight}
int wv[MAXW];

int main() {
    cin >> s >> n;

    fox(i, n) {
        int v, w, k;
        cin >> v >> w >> k;
        items[w].eb(v, k);
    }
    rep(i, 1, s) {
        sort(items[i].rbegin(), items[i].rend());
        int cnt = s/i + 1, idx = 0;
        while (cnt && idx != (int)items[i].size()) {
            if (items[i][idx].S == 0) {
                ++idx; continue;
            }
            items[i][idx].S--;
            cnt--;
            e.eb(items[i][idx].F, i);
        }

    }

    wv[0] = 0;
    for (auto [val, wt] : e) {
        for (int i = s; i-wt >= 0; --i) {
            tomax(wv[i], wv[i-wt] + val);
        }
    }
    cout << wv[s] << '\n';

    return 0;
}

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