Submission #1212194

#	Time	Username	Problem	Language	Result	Execution time	Memory
1212194		nanh0607	Knapsack (NOI18_knapsack)	C++17	100 / 100	45 ms	1864 KiB

knapsack

#include <bits/stdc++.h>
#define FOR(i, l, r) for (int i=l; i<=r; i++)
#define FOR2(i, l, r) for (int i=l; i>=r; i--)
#define ALL(v) v.begin(), v.end()
#define fi first
#define se second
#define pii pair<int, int>
#define pb push_back
using namespace std;

void solve() {
    int s, n;
    cin >> s >> n;
    map<int, vector<pii>> groups;
    FOR(i, 1, n) {
        int v, w, k;
        cin >> v >> w >> k;
        groups[w].pb({v, k});
    }
    
    // for (auto i:groups) {
    //     cout << i.fi; ce;
    //     for (auto j:i.se) {
    //         cout << j.fi << ' ' << j.se; ce;
    //     }
    //     ce;
    // }

    vector<int> dp(s+1, 0);
    for (auto& group:groups) {
        int w = group.fi;
        int limit = s/w;
        sort(ALL(group.se), [](const pii &a, const pii &b) {
            return a.first > b.first;
        });
        for (auto item:group.se) {
            int v = item.fi, k = item.se;
            while (k > 0 && limit > 0) {
                k--; limit--;
                FOR2(i, s, w) {
                    dp[i] = max(dp[i], dp[i-w] + v);
                }
            }
            if (limit == 0) {break;}
        }
    }

    cout << dp[s];
}

int main() {
	ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    solve();
}

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