Submission #975083

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
975083	2024-05-04T11:49:25 Z	allw	Knapsack (NOI18_knapsack)	C++17	Compilation error	0 ms	0 KB

knapsack

#include <iostream>
#include <vector>

int main() {
    int s, n; std::cin >> s >> n;
    std::vector<std::vector<int>> items(n, std::vector<int>(3));

    // s in [1, 2000]
    for (int i = 0; i < n; ++i) {
        std::cin >> items[i][0] >> items[i][1] >> items[i][2];
        // cost, weight, count
    }

    std::sort(items.begin(), items.end(), std::greater<std::vector<int>>());

    std::vector<std::vector<int>> a(2001, std::vector<int>());
    for (int i = 0; i < n; ++i) {
        int cnt = items[i][2];
        int w = items[i][1];
        int max_items = 2000 / w;

        while (cnt > 0 && a[w].size() < max_items) {
            a[w].push_back(items[i][0]);
            cnt--;
        }
    }

    std::vector<std::vector<int>> items2;
    for (int i = 0; i < a.size(); ++i) {
        for (int j = 0; j < a[i].size(); ++j) {
            items2.push_back({i, a[i][j]});
            // w, cost
        }
    }

    std::vector<int> dp(s + 1, INT_MIN);
    dp[0] = 0;

    for (int i = 0; i < items2.size(); ++i) {
        int w = items2[i][0];
        int c = items2[i][1];
        std::vector<int> new_dp = dp;

        for (int j = 0; j < dp.size(); ++j) {
            if (dp[j] >= 0 && j + w < dp.size()) {
                new_dp[j + w] = std::max(new_dp[j + w], dp[j] + c);
            }
        }

        dp = new_dp;
    }

    int mmax = 0;
    for (int i = 0; i < dp.size(); ++i) {
        mmax = std::max(dp[i], mmax);
    }

    std::cout << mmax << '\n';
}

Compilation message

knapsack.cpp: In function 'int main()':
knapsack.cpp:14:10: error: 'sort' is not a member of 'std'
   14 |     std::sort(items.begin(), items.end(), std::greater<std::vector<int>>());
      |          ^~~~
knapsack.cpp:22:39: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   22 |         while (cnt > 0 && a[w].size() < max_items) {
      |                           ~~~~~~~~~~~~^~~~~~~~~~~
knapsack.cpp:29:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   29 |     for (int i = 0; i < a.size(); ++i) {
      |                     ~~^~~~~~~~~~
knapsack.cpp:30:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   30 |         for (int j = 0; j < a[i].size(); ++j) {
      |                         ~~^~~~~~~~~~~~~
knapsack.cpp:36:32: error: 'INT_MIN' was not declared in this scope
   36 |     std::vector<int> dp(s + 1, INT_MIN);
      |                                ^~~~~~~
knapsack.cpp:3:1: note: 'INT_MIN' is defined in header '<climits>'; did you forget to '#include <climits>'?
    2 | #include <vector>
  +++ |+#include <climits>
    3 | 
knapsack.cpp:39:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   39 |     for (int i = 0; i < items2.size(); ++i) {
      |                     ~~^~~~~~~~~~~~~~~
knapsack.cpp:44:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   44 |         for (int j = 0; j < dp.size(); ++j) {
      |                         ~~^~~~~~~~~~~
knapsack.cpp:45:37: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   45 |             if (dp[j] >= 0 && j + w < dp.size()) {
      |                               ~~~~~~^~~~~~~~~~~
knapsack.cpp:54:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   54 |     for (int i = 0; i < dp.size(); ++i) {
      |                     ~~^~~~~~~~~~~