Submission #776951

#	Time	Username	Problem	Language	Result	Execution time	Memory
776951		qenneth	Knapsack (NOI18_knapsack)	C++17	37 / 100	1079 ms	1108 KiB

knapsack

#pragma GCC optimize("O3")
#pragma GCC target("popcnt")
#include <bits/stdc++.h>
using namespace std;
#define FASTIO ios_base::sync_with_stdio(false);cin.tie(NULL)
#define all(x) x.begin(), x.end()
#define chmax(x, a) x = max(x, a);
#define chmin(x, a) x = min(x, a);

// usaco
void setIO(string s) {
	freopen((s + ".in").c_str(), "r", stdin);
	freopen((s + ".out").c_str(), "w", stdout);
}

const int MOD = 1e9 + 7;

int main() {
	FASTIO;
	// setIO("snakes");
	int s, n;
	cin >> s >> n;
	vector<vector<int>> a(n, vector<int>(3, 0));
	for (int i = 0; i < n; i++) {
		for (int j = 0; j < 3; j++) {
			cin >> a[i][j];
		}
	}
	vector<vector<int>> dp(n + 1, vector<int> (s + 1, 0));
	for (int i = 0; i < n; i++) {
		for (int j = 0; j <= s; j++) {
			dp[i + 1][j] = max(dp[i + 1][j], dp[i][j]);
			for (int k = 0; k <= a[i][2]; k++) {
				if (j + k * a[i][1] <= s) {
					dp[i + 1][j + k * a[i][1]] = max(dp[i + 1][j + k * a[i][1]], dp[i][j] + k * a[i][0]);
				}
			}
		}
	}
	cout << dp[n][s] << "\n";
}

Compilation message (stderr)

knapsack.cpp: In function 'void setIO(std::string)':
knapsack.cpp:12:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   12 |  freopen((s + ".in").c_str(), "r", stdin);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
knapsack.cpp:13:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   13 |  freopen((s + ".out").c_str(), "w", stdout);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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