Submission #871110

#	Time	Username	Problem	Language	Result	Execution time	Memory
871110		tvladm2009	Knapsack (NOI18_knapsack)	C++17	100 / 100	55 ms	4184 KiB

knapsack

#include <bits/stdc++.h>
 
using i64 = long long;

std::vector<std::pair<int, int>> a[2005];
int dp[2005];

int main() {
    std::ios::sync_with_stdio(false);
    std::cin.tie(nullptr);
    
    int s, n;
    std::cin >> s >> n;
    for (int i = 1; i <= n; i++) {
        int v, w, k;
        std::cin >> v >> w >> k;
        a[w].emplace_back(std::make_pair(v, k));
    }
    std::vector<int> val, w;
    for (int step = 1; step <= 2000; step++) {
        std::sort(a[step].rbegin(), a[step].rend());
        int lim = s / step;
        for (int j = 0; j < a[step].size() && lim > 0; j++) {
            for (int j2 = 1; j2 <= a[step][j].second && lim > 0; j2++) {
                val.emplace_back(a[step][j].first);
                w.emplace_back(step);
                lim--;
            }
        }
    }

    for (int i = 0; i < val.size(); i++) {
        for (int j = s; j >= w[i]; j--) {
            dp[j] = std::max(dp[j], dp[j - w[i]] + val[i]);
        }
    }
    std::cout << dp[s] << "\n";

    return 0;
}

Compilation message (stderr)

knapsack.cpp: In function 'int main()':
knapsack.cpp:23:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   23 |         for (int j = 0; j < a[step].size() && lim > 0; j++) {
      |                         ~~^~~~~~~~~~~~~~~~
knapsack.cpp:32:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   32 |     for (int i = 0; i < val.size(); i++) {
      |                     ~~^~~~~~~~~~~~

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