Submission #1255920

#	Time	Username	Problem	Language	Result	Execution time	Memory
1255920		goutom	Knapsack (NOI18_knapsack)	C++20	100 / 100	35 ms	2884 KiB

knapsack

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

struct Item {
    long long value;
    int weight;     
    long long qty;  
};

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    int capacity, numItems;
    cin >> capacity >> numItems;

    vector<priority_queue<pair<long long, long long>>> grouped(capacity + 1);
    for (int i = 0; i < numItems; i++) {
        Item item;
        cin >> item.value >> item.weight >> item.qty;
        grouped[item.weight].push(make_pair(item.value, item.qty));
    }
    vector<long long> dp(capacity + 1, 0);
    for (int w = 1; w <= capacity; w++) {
        long long maxCanTake = capacity / w;
        while (!grouped[w].empty() && maxCanTake > 0) {
            pair<long long, long long> topItem = grouped[w].top();
            grouped[w].pop();
            long long value = topItem.first;
            long long qty   = topItem.second;
            if (qty > maxCanTake) qty = maxCanTake;
            maxCanTake -= qty;
            for (int i = 0; i < qty; i++) {
                for (int c = capacity; c >= w; c--) {
                    dp[c] = max(dp[c], dp[c - w] + value);
                }
            }
        }
    }
    long long answer = 0;
    for (int c = 1; c <= capacity; c++) {
        answer = max(answer, dp[c]);
    }
    cout << answer << "\n";
    return 0;
}

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