Submission #630597

#	Time	Username	Problem	Language	Result	Execution time	Memory
630597		chjiao	Knapsack (NOI18_knapsack)	C++14	73 / 100	1092 ms	7108 KiB

knapsack

#include <bits/stdc++.h>
using namespace std;
#define ll long long

int main() {
    ios_base::sync_with_stdio(false); cin.tie(NULL);
    // freopen("Knapsack.in", "r", stdin);
    // freopen("Knapsack.out", "w", stdout);

	int limit, type_num;
	cin >> limit >> type_num;
	
	// map<int, vector<tuple<int, int, int>>> by_weight;  //{weight, {value, amount}}, 根据weight从小到大排序

    vector<vector<int>> items(type_num, vector<int>(3));
	for (int i = 0; i < type_num; i++) {
        int weight, num, val;
        cin >> val >> weight >> num;
        if (weight>limit) continue;
        items[i][0] = weight;  items[i][1] = num;  items[i][2] = val; 
        
	}
	
    vector<int> dp(limit+1, -1);
    dp[0]= 0;

    for (int t=0; t<items.size(); t++) {
        int weight, num, val;
        weight = items[t][0]; num = items[t][1]; val = items[t][2];
        for (int i=limit - weight; i>=0; i--) {
            if (dp[i]>=0) {
                for (int k=1; k <= num && i+weight*k <= limit; k++) {
                    dp[i+weight*k] = max(dp[i+weight*k], dp[i] + k*val);
                }
                
            }
        }
    }

    cout << *max_element(dp.begin(), dp.end()) << endl;
}

Compilation message (stderr)

knapsack.cpp: In function 'int main()':
knapsack.cpp:27:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   27 |     for (int t=0; t<items.size(); t++) {
      |                   ~^~~~~~~~~~~~~

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