Submission #887592

#	Time	Username	Problem	Language	Result	Execution time	Memory
887592		_saketks_07	Knapsack (NOI18_knapsack)	C++14	100 / 100	65 ms	6596 KiB

knapsack

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
 
map<int, int> sum;
 
const int mxN = 2*1e5+10;
 
ll dp[mxN];
 
int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int s, n;
    cin >> s >> n;
    vector<array<ll, 3>> v;
    for(int i = 0; i < n; i++) {
        ll val, w, k;
        cin >> val >> w >> k;
        v.push_back({val, w, k});
    }
    sort(v.rbegin(), v.rend());
    vector<array<ll, 2>> a;
    for(auto it : v) {
        ll val = it[0], w = it[1], k = it[2];
        while(sum[w]+w <= s && k) {
            sum[w] += w;
            k--;
            a.push_back({w, val});
        }
    }
    for(auto it : a) {
        for(int x = s; x >= 0; x--) {
            if(x-it[0] >= 0) {
                dp[x] = max(dp[x], dp[x-it[0]]+it[1]);
            }
        }
    }
    ll ans = 0;
    for(int i = 1; i <= s; i++) {
        ans = max(ans, dp[i]);
    }
    cout << ans;
    return 0;
}

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