Submission #1265584

#	Time	Username	Problem	Language	Result	Execution time	Memory
1265584		tochika	Knapsack (NOI18_knapsack)	C++20	73 / 100	1096 ms	1600 KiB

knapsack

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

#define IN "iii.txt"
#define OUT "ooo.txt"
#define MULTI_TEST 0

const int MOD = 1e9 + 7;
const int MAX = 1e8 + 5;
const lint LMAX = 1e18;

void solve() {
    int s, n;
    cin >> s >> n;

    vector<vector<pair<int, int>>> grouped(s + 1);

    for (int i = 0; i < n; i++) {
        int v, w, k;
        cin >> v >> w >> k;

        if (w > s)
            continue;

        grouped[w].push_back({v, k});
    }

    vector<lint> dp(s + 1, 0);

    for (int w = 1; w <= s; w++) {
        if (grouped[w].empty())
            continue;

        for (auto items : grouped[w]) {
            int v = items.first;
            int k = items.second;

            for (int rem = 0; rem < w; rem++) {
                deque<pair<int, lint>> dq;

                int max_i = (s - rem) / w;
                for (int i = 0; i <= max_i; i++) {
                    int c = rem + i * w;

                    lint base = dp[c] - (lint)i * v;

                    while (!dq.empty() && dq.back().second <= base)
                        dq.pop_back();

                    dq.push_back({i, base});

                    if (dq.front().first < i - k)
                        dq.pop_front();

                    if (!dq.empty()) {
                        lint best = dq.front().second;
                        lint new_total = best +(lint)i * v;

                        dp[c] = max(dp[c], new_total);
                    }


                }
            }
        }
    }

    cout << *max_element(dp.begin(), dp.end());
}

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

    if (fopen(IN, "r")) {
        freopen(IN, "r", stdin);
        freopen(OUT, "w", stdout);
    }

    int t = 1;
    if (MULTI_TEST) {
        cin >> t;
    }

    for (int i = 1; i <= t; i++) {
        solve();
        cout << '\n';
    }

    return 0;
}

Compilation message (stderr)

knapsack.cpp: In function 'int main()':
knapsack.cpp:77:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   77 |         freopen(IN, "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~
knapsack.cpp:78:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   78 |         freopen(OUT, "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~

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