Submission #486238

#	Time	Username	Problem	Language	Result	Execution time	Memory
486238		joshualiu555	Knapsack (NOI18_knapsack)	C++14	12 / 100	0 ms	204 KiB

knapsack

/*
  _____                                     _        _
 / ____|                                   | |      | |
| |  __ _ __ __ _ ___ ___ _   _ _ __   ___ | |_ __ _| |_ ___
| | |_ | '__/ _` / __/ __| | | | '_ \ / _ \| __/ _` | __/ _ \
| |__| | | | (_| \__ \__ \ |_| | |_) | (_) | || (_| | || (_) |
 \_____|_|  \__,_|___/___/\__, | .__/ \___/ \__\__,_|\__\___/
                           __/ | |
                          |___/|_|
*/

#include <fstream>
#include <iostream>
#include <iomanip>
#include <algorithm>
#include <numeric>
#include <utility>
#include <array>
#include <vector>
#include <set>
#include <map>
#include <stack>
#include <queue>
#include <cmath>
#include <cstring>
#include <climits>
#include <bitset>
#include <string>
#include <sstream>

using namespace std;

#define FOR(i, x, s) for (int i = x; i < s; i++)
#define TRAV(it, x) for (auto it = x.begin(); it != x.end(); it++)

using ll = long long;
const int INF = 2e5 + 5;
const int MOD = 1e9 + 7;
// DURL
const int dx[4] = {1, -1, 0, 0};
const int dy[4] = {0, 0, 1, -1};

ll S, N;
map<ll, vector<pair<ll, ll>>> weight_group;
ll dp[2005];

int main()
{
    std::ios_base::sync_with_stdio(false); cin.tie(0);

//    ifstream cin(".in");
//    ofstream cout(".out");

    memset(dp, -1, sizeof(dp));

    cin >> S >> N;
    for (ll i = 0; i < N; i++) {
        ll V, W, K;
        cin >> V >> W >> K;
        weight_group[W].push_back(make_pair(V, K));
    }

    dp[0] = 0;
    for (auto it = weight_group.begin(); it != weight_group.end(); it++) {
        ll weight = it -> first;
        // first = value, second = amount
        vector<pair<ll, ll>> items = it -> second;
        for (ll i = S; i >= 0; i--) {
            if (dp[i] == -1) continue;
            ll current = i;
            ll id = 0;
            ll left = items[id].second;
            while (current <= S) {
                if (id == (ll)items.size()) break;
                dp[current + weight] = max(dp[current + weight], dp[current] + items[id].first);
                left--;
                if (left == 0) {
                    id++;
                    left = items[id].second;
                }
                current += weight;
            }
        }
    }

    cout << *max_element(dp, dp + S + 1);

    return 0;
}

/*
 *
*/

//

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