Submission #877737

#	Time	Username	Problem	Language	Result	Execution time	Memory
877737		Beerus13	Knapsack (NOI18_knapsack)	C++14	100 / 100	56 ms	6236 KiB

knapsack

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define val first
#define sl second
#define pii pair<int, int>
const int N = 1e5 + 5;

int n, S;
int dp[2005];
vector<pii> w[N];

bool cmp(pii &a, pii &b) {
    return a.val > b.val;
}

int main() {
    ios::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    cin >> S >> n;
    for(int i = 1; i <= n; ++i) {
        int val, W, sl; cin >> val >> W >> sl;
        w[W].emplace_back(val, sl);
    }
    for(int i = 1; i <= S; ++i) {
        sort(w[i].begin(), w[i].end(), cmp);
        int cnt = 0;
        for(pii res : w[i]) {
            if(cnt > S / i) break;
            for(int j = 1; j <= res.sl; ++j) {
                for(int k = S; k >= i; --k) {
                    dp[k] = max(dp[k], dp[k - i] + res.val);
                }
                ++cnt;
                if(cnt > S / i) break;
            }
        }
    }
    int ans = 0;
    for(int i = 1; i <= S; ++i) ans = max(ans, dp[i]);
    cout << ans << '\n';
    return 0;
}

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