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Submission #678448

# Submission time Handle Problem Language Result Execution time Memory
678448 2023-01-06T02:47:11 Z whaaaa Knapsack (NOI18_knapsack) C++11
100 / 100
 152 ms 35148 KB 
#include <iostream>
#include <vector>
#include <map>
#include <algorithm>

using std::cout;
using std::endl;
using std::vector;
using std::pair;

int main() {
	int limit;
	int type_num;
	std::cin >> limit >> type_num;
	
	std::map<int, vector<pair<int, int>>> by_weight;
	for (int t = 0; t < type_num; t++) {
		int value;
		int weight;
		int amt;
		std::cin >> value >> weight >> amt;
		if (weight <= limit && amt > 0) {
			by_weight[weight].push_back({value, amt});
		}
	}
	
	/*
	 * best[i][j] contains the most value we can
	 * get using j weight and the first i weight types
	 */
	vector<vector<long long>> best(
		by_weight.size() + 1, vector<long long>(limit + 1, INT32_MIN)
	);
	best[0][0] = 0;
	int at = 1;
	for (auto& [w, items] : by_weight) {
		// sort items in reverse order by value
		std::sort(items.begin(), items.end(), std::greater<pair<int, int>>());
		for (int i = 0; i <= limit; i++) {
			best[at][i] = best[at - 1][i];
			int copies = 0;
			int type_at = 0;
			int curr_used = 0;
			long long profit = 0;
			// go through as many items until we run out of items or usable weight
			while ((copies + 1) * w <= i && type_at < items.size()) {
				copies++;
				profit += items[type_at].first;
				if (best[at - 1][i - copies * w] != INT32_MIN) {
					best[at][i] = std::max(
						best[at][i],
						best[at - 1][i - copies * w] + profit
					);
				}
				
				curr_used++;
				if (curr_used == items[type_at].second) {
					curr_used = 0;
					type_at++;
				}
			}
		}
		at++;
	}
	cout << *std::max_element(best.back().begin(), best.back().end()) << endl;
}

Compilation message

knapsack.cpp: In function 'int main()':
knapsack.cpp:36:13: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   36 |  for (auto& [w, items] : by_weight) {
      |             ^
knapsack.cpp:46:44: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   46 |    while ((copies + 1) * w <= i && type_at < items.size()) {
      |                                    ~~~~~~~~^~~~~~~~~~~~~~

Subtask #1
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct

Subtask #2
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 0 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 2 ms 1748 KB Output is correct
7 Correct 2 ms 1876 KB Output is correct
8 Correct 2 ms 1712 KB Output is correct
9 Correct 2 ms 1708 KB Output is correct
10 Correct 2 ms 1748 KB Output is correct

Subtask #3
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 0 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 2 ms 1748 KB Output is correct
7 Correct 2 ms 1876 KB Output is correct
8 Correct 2 ms 1712 KB Output is correct
9 Correct 2 ms 1708 KB Output is correct
10 Correct 2 ms 1748 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Correct 3 ms 340 KB Output is correct
13 Correct 1 ms 304 KB Output is correct
14 Correct 1 ms 340 KB Output is correct
15 Correct 1 ms 340 KB Output is correct
16 Correct 2 ms 1748 KB Output is correct
17 Correct 2 ms 1748 KB Output is correct
18 Correct 2 ms 1836 KB Output is correct
19 Correct 2 ms 1748 KB Output is correct
20 Correct 2 ms 1876 KB Output is correct

Subtask #4
24.0 / 24.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 0 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 2 ms 1748 KB Output is correct
11 Correct 2 ms 1876 KB Output is correct
12 Correct 2 ms 1712 KB Output is correct
13 Correct 2 ms 1708 KB Output is correct
14 Correct 2 ms 1748 KB Output is correct
15 Correct 1 ms 212 KB Output is correct
16 Correct 3 ms 340 KB Output is correct
17 Correct 1 ms 304 KB Output is correct
18 Correct 1 ms 340 KB Output is correct
19 Correct 1 ms 340 KB Output is correct
20 Correct 2 ms 1748 KB Output is correct
21 Correct 2 ms 1748 KB Output is correct
22 Correct 2 ms 1836 KB Output is correct
23 Correct 2 ms 1748 KB Output is correct
24 Correct 2 ms 1876 KB Output is correct
25 Correct 1 ms 212 KB Output is correct
26 Correct 4 ms 340 KB Output is correct
27 Correct 1 ms 300 KB Output is correct
28 Correct 1 ms 296 KB Output is correct
29 Correct 1 ms 340 KB Output is correct
30 Correct 3 ms 1836 KB Output is correct
31 Correct 2 ms 1876 KB Output is correct
32 Correct 2 ms 1748 KB Output is correct
33 Correct 2 ms 1748 KB Output is correct
34 Correct 2 ms 1748 KB Output is correct

Subtask #5
27.0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 0 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 2 ms 1748 KB Output is correct
11 Correct 2 ms 1876 KB Output is correct
12 Correct 2 ms 1712 KB Output is correct
13 Correct 2 ms 1708 KB Output is correct
14 Correct 2 ms 1748 KB Output is correct
15 Correct 1 ms 212 KB Output is correct
16 Correct 3 ms 340 KB Output is correct
17 Correct 1 ms 304 KB Output is correct
18 Correct 1 ms 340 KB Output is correct
19 Correct 1 ms 340 KB Output is correct
20 Correct 2 ms 1748 KB Output is correct
21 Correct 2 ms 1748 KB Output is correct
22 Correct 2 ms 1836 KB Output is correct
23 Correct 2 ms 1748 KB Output is correct
24 Correct 2 ms 1876 KB Output is correct
25 Correct 1 ms 212 KB Output is correct
26 Correct 4 ms 340 KB Output is correct
27 Correct 1 ms 300 KB Output is correct
28 Correct 1 ms 296 KB Output is correct
29 Correct 1 ms 340 KB Output is correct
30 Correct 3 ms 1836 KB Output is correct
31 Correct 2 ms 1876 KB Output is correct
32 Correct 2 ms 1748 KB Output is correct
33 Correct 2 ms 1748 KB Output is correct
34 Correct 2 ms 1748 KB Output is correct
35 Correct 64 ms 2304 KB Output is correct
36 Correct 79 ms 2392 KB Output is correct
37 Correct 68 ms 2260 KB Output is correct
38 Correct 71 ms 2664 KB Output is correct
39 Correct 93 ms 3300 KB Output is correct
40 Correct 152 ms 35148 KB Output is correct
41 Correct 119 ms 34324 KB Output is correct
42 Correct 118 ms 34340 KB Output is correct
43 Correct 131 ms 34352 KB Output is correct
44 Correct 130 ms 34320 KB Output is correct
45 Correct 101 ms 6732 KB Output is correct
46 Correct 90 ms 3048 KB Output is correct
47 Correct 101 ms 9932 KB Output is correct
48 Correct 122 ms 19272 KB Output is correct
49 Correct 86 ms 3976 KB Output is correct
50 Correct 116 ms 3948 KB Output is correct