Submission #1171725

#	Time	Username	Problem	Language	Result	Execution time	Memory
1171725		abcsedafaef	Knapsack (NOI18_knapsack)	C++20	29 / 100	3 ms	1100 KiB

knapsack

#include <bits/stdc++.h>
using namespace std;
#define vi vector<int>
#define fast_io ios_base::sync_with_stdio(false); cin.tie(NULL)

void solve() {
    int x, n;
    cin >> x >> n;
    vi v_temp, c_temp, t_temp;
    for (int i = 0; i < n; i++) {
        int value, weight, amt;
        cin >> value >> weight >> amt;
        if (weight <= x && amt > 0) {
            v_temp.push_back(value);
            c_temp.push_back(weight);
            t_temp.push_back(amt);
        }
    }
    n = v_temp.size();
    if(n == 0) {
        cout << 0;
        return;
    }
    vi v = v_temp, c = c_temp, t = t_temp;
    if(n == 1) {
        int maxCopies = min(t[0], x / c[0]);
        cout << maxCopies * v[0];
        return;
    }
    vector<vi> dp(n + 1, vi(x + 1, 0));
    for (int i = n - 1; i >= 0; i--) {
        for (int j = 0; j <= x; j++) {
            int skip = dp[i + 1][j];
            dp[i][j] = skip;
            if(t[i]*c[i]>x){
              continue;
            }
            for (int k = 1; k <= t[i] && k*c[i]<=j; k++) {
                if (j - k * c[i] >= 0) {
                    int pick = k * v[i] + dp[i + 1][j - k * c[i]];
                    dp[i][j] = max(dp[i][j], pick);
                }
            }
        }
    }
    cout << dp[0][x];
}

int main() {
    fast_io;
    solve();
    return 0;
}

• Subtask 1: 12 / 12
• Subtask 2: 17 / 17
• Subtask 3: 0 / 20
• Subtask 4: 0 / 24
• Subtask 5: 0 / 27