Submission #1321941

#	Time	Username	Problem	Language	Result	Execution time	Memory
1321941		jim_x	Knapsack (NOI18_knapsack)	C++17	73 / 100	336 ms	327680 KiB

knapsack

#include <iostream>
#include <vector>
#include <algorithm>
#include <map>
#include <set>
#include <cmath>
#include <numeric>
#include <queue>
#include <stack>
#include <iomanip>
using namespace std;

void baseIO(string s = ""){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    if (s.size()){
        freopen((s + ".in").c_str(), "r", stdin);
        freopen((s + ".out").c_str(), "w", stdout);
    }
}

int main() {
    baseIO();

    int s, n;
    cin >> s >> n;

    vector<vector<int>> items(n, vector<int>(3));
    vector<pair<int, int>> ai;
    for (int i = 0; i < n; i++){
        cin >> items[i][0] >> items[i][1] >> items[i][2];
        items[i][2] = min(items[i][2], s / items[i][1]);
        while (items[i][2]--) ai.push_back({items[i][0], items[i][1]});
    }

    
    int dp[s + 1]{};

    for (auto &item : ai){
        for (int pos = s - item.second; pos >= 0; pos--){
            dp[pos + item.second] = max(dp[pos + item.second], dp[pos] + item.first);
        }
    }

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

    return 0;
}

Compilation message (stderr)

knapsack.cpp: In function 'void baseIO(std::string)':
knapsack.cpp:17:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   17 |         freopen((s + ".in").c_str(), "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
knapsack.cpp:18:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   18 |         freopen((s + ".out").c_str(), "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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