Submission #1113270

#	Time	Username	Problem	Language	Result	Execution time	Memory
1113270		Yang8on	Knapsack (NOI18_knapsack)	C++17	100 / 100	45 ms	3960 KiB

knapsack

#include <bits/stdc++.h>
#define file "main"
#define maxn (int) 2005
#define ll long long
#define pii pair<int, int>
#define fi(i, a, b) for(int i = a; i <= b; i ++)
#define fid(i, a, b) for(int i = a; i >= b; i --)

using namespace std;

int S, n, N;
vector<pii> gr[maxn];
pii a[(int)1e5 + 5];
ll dp[maxn];

 main() {
//    freopen(file".inp", "r", stdin);

    ios::sync_with_stdio(false);
    cin.tie(0);

    cin >> S >> n ;
    fi(i, 1, n) {
        int v, w, k; cin >> v >> w >> k ;
        gr[w].push_back({ v, k });
    }

    fi(i, 1, S) sort(gr[i].begin(), gr[i].end());
    fi(i, 1, S) {
        int mx_sl = S/i;
        while(gr[i].size() && mx_sl > 0) {
            int v, k; tie(v, k) = gr[i].back();
            gr[i].pop_back();
            fi(j, 1, min(mx_sl, k)) a[++N] = { v, i };
            mx_sl = max(0, mx_sl - k);
        }
    }

    memset(dp, -0x3f, sizeof dp);
    dp[0] = 0;

    fi(i, 1, N) {
        fid(j, S, a[i].second) {
            dp[j] = max(dp[j], dp[j - a[i].second] + a[i].first);
        }
    }

    cout << *max_element(dp + 0, dp + S + 1);

    return 0;
}

Compilation message (stderr)

knapsack.cpp:16:2: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   16 |  main() {
      |  ^~~~

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