Submission #1033439

#	Time	Username	Problem	Language	Result	Execution time	Memory
1033439		cryptobunny	Knapsack (NOI18_knapsack)	C++14	37 / 100	1 ms	436 KiB

knapsack

#include <iostream>
#include <vector>
#include <cassert>
using namespace std;

int main() {
    int s, n;
    cin >> s >> n;
    vector<int> val, cost;

    for (int i = 0; i < n; i++) {
        int v, w, k;
        cin >> v >> w >> k;
        int j;
        for (j = 30; j >= 1; j--) {
            if (k >= (1 << j)) {
                break;
            }
        }
        for (int x = 0; x < j; x++) {
            val.push_back(v << x);
            cost.push_back(w << x);
            k -= 1 << x;
        }
        if (k) {
            val.push_back(v * k);
            cost.push_back(w * k);
        }
    }
    vector<int> dp(s + 1);
    int ans = 0;
    for (int i = 0; i < val.size(); i++) {
        assert(i < cost.size());
        // cout << val[i] << " " << cost[i] << endl;
        for (int w = s; w >= cost[i]; w--) {
            dp[w] = max(dp[w], dp[w - cost[i]] + val[i]);
            ans = max(ans, dp[w]);
        }
    }
    cout << ans << endl;
}

Compilation message (stderr)

knapsack.cpp: In function 'int main()':
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++) {
      |                     ~~^~~~~~~~~~~~
In file included from /usr/include/c++/10/cassert:44,
                 from knapsack.cpp:3:
knapsack.cpp:33:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   33 |         assert(i < cost.size());
      |                ~~^~~~~~~~~~~~~

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