Submission #887710

#	Time	Username	Problem	Language	Result	Execution time	Memory
887710		votranngocvy	Knapsack (NOI18_knapsack)	C++14	100 / 100	70 ms	34388 KiB

knapsack

#include <bits/stdc++.h>
using namespace std;

#define int long long
#define pii pair<int,int>
#define fi first
#define se second
#define mp make_pair
const int N = 1e5 + 5;
int dp[2005][2005];
vector<pii>a[2005];

signed main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    int n,s;
    cin >> s >> n;
    for (int i = 1; i <= n; i++) {
        int v,w,k;
        cin >> v >> w >> k;
        a[w].push_back(mp(v,k));
    }
    for (int i = 1; i <= 2000; i++) 
        sort(a[i].begin(),a[i].end(),greater<pii>());
    int ans = 0;
    for (int i = 1; i <= 2000; i++) {
        for (int j = 0; j <= s; j++) {
            dp[i][j] = max(dp[i][j],dp[i - 1][j]);
            int sumW = 0,sumV = 0;
            for (auto x: a[i]) {
                for (int k = 1; k <= x.se; k++) {
                    sumW += i,sumV += x.fi;
                    if (sumW > j) break;
                    dp[i][j] = max(dp[i][j],dp[i - 1][j - sumW] + sumV);
                }
                if (sumW > j) break;
            }
            ans = max(ans,dp[i][j]);
        }
    }
    cout << ans << "\n";
}

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