Submission #944410

#	Time	Username	Problem	Language	Result	Execution time	Memory
944410		cot	Knapsack (NOI18_knapsack)	C++14	100 / 100	185 ms	248360 KiB

knapsack

#include <iostream>
#include <algorithm>
#include <vector>
#define int long long
#define ff first
#define ss second
#define pb push_back
#define pp pop_back
#define all(x) x.begin(),x.end()
#define pii pair<int,int>
#define r0 return 0
using namespace std;
const int N = 2005;
int s, n, raod[N], w, vv, r, cnt, cur, ans;
vector <pii> v[N];
int dp[N*12][N];
vector <pii> g;
signed main() {
    ios::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    cin >> s >> n;
    for (int i = 1; i <= n; i++) {
        cin >> vv >> w >> r;
        v[w].pb({vv,r});
        raod[w] += r;
    }
    for (int i = 1; i <= s; i++) {
        sort(all(v[i]));
        reverse(all(v[i]));
        cnt = 0; cur = 0;
        for (int j = 1; j <= min(raod[i], s / i); j++) {
            cnt++;

            g.pb({i, v[i][cur].ff});
            if (v[i][cur].ss == cnt) cur++, cnt = 0;
        }
    }
    n = g.size();
    for (int i = 1; i <= n; i++) {
        //cout<<g[i - 1].ff <<" "<<g[i - 1].ss<<endl;
        for (int j = 0; j <= s; j++) {
            dp[i][j] = dp[i - 1][j];
            if (j < g[i - 1].ff) continue;
            dp[i][j] = max (dp[i - 1][j], dp[i - 1][j - g[i - 1].ff] + g[i - 1].ss);
            ans = max(ans, dp[i][j]);
        }
    }
    cout << ans << endl;
    r0;
}

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