Submission #982021

#	Time	Username	Problem	Language	Result	Execution time	Memory
982021		Amirreza_Fakhri	Knapsack (NOI18_knapsack)	C++17	100 / 100	109 ms	151464 KiB

knapsack

// In the name of the God
#include <bits/stdc++.h>
#define ll long long
// #define int long long
#define pb push_back
#define F first
#define S second
#define mp make_pair
#define pii pair <int, int>
#define smin(x, y) (x) = min((x), (y))
#define smax(x, y) (x) = max((x), (y))
#define all(x) (x).begin(), (x).end()
using namespace std;

// #pragma GCC optimize("O3,unroll-loops")
// #pragma GCC target("avx2")

const int inf = 1e9+7;
const int mod = 998244353;
const int maxw = 2e3+5, maxv = 1e6+5;

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

int s, n, dp[maxw*15][maxw];
vector <pii> va[maxv];
vector <int> we[maxw];

int32_t main() {
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    cin >> s >> n;
    for (int i = 0; i < n; i++) {
        int v, w, k; cin >> v >> w >> k;
        va[v].pb(mp(w, k));
        // while (k--) we[w].pb(v);
    }
    for (int i = maxv-1; i >= 1; i--) {
        for (pii p : va[i]) {
            int w = p.F, k = p.S;
            int left = s/w-we[w].size();
            while (left and k) {
                we[w].pb(i);
                left--, k--;
            }
        }
    }
    int cnt = 1;
    for (int i = 1; i <= s; i++) {
        for (int j : we[i]) {
            for (int k = 1; k <= s; k++) {
                dp[cnt][k] = dp[cnt-1][k];
                if (i <= k) {
                    smax(dp[cnt][k], dp[cnt-1][k-i]+j);
                }
            }
            cnt++;
        }
    }
    cout << dp[cnt-1][s] << '\n';
    return 0;
}





/*
srand(time(0));
cout << (rand()%1900) + 1 << ' ' << (rand()%2)+5 << '\n';
*/

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