Submission #1086679

#	Time	Username	Problem	Language	Result	Execution time	Memory
1086679		quangminh412	Knapsack (NOI18_knapsack)	C++14	37 / 100	5 ms	1956 KiB

knapsack

#include<bits/stdc++.h>

using namespace std;

#define faster() ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define ll long long

const int maxn = 1e5 + 9;

ll s;
int n;
ll v[maxn], w[maxn], k[maxn];

int main()
{
	if (fopen("BALO.INP", "r"))
	{
		freopen("BALO.INP", "r", stdin);
		freopen("BALO.OUT", "w", stdout);		
	}
	faster();
	
	cin >> s >> n;
	bool sub2 = true;
	for (int i = 1; i <= n; i++)
	{
		cin >> v[i] >> w[i] >> k[i];
		if (k[i] != 1) sub2 = false;
	}
	
	if (n == 1)
	{
		ll num = s / w[1];
		cout << num * v[1] << '\n';
		
		return 0;	
	} else
	if (sub2 == true)
	{
		vector<vector<ll>> dp(n + 5, vector<ll>(s + 5, 0));
		ll ans = 0;
		for (int i = 1; i <= n; i++)
			for (int j = 0; j <= s; j++)
			{
				dp[i][j] = dp[i - 1][j];
				if (j - w[i] >= 0)
					dp[i][j] = max(dp[i][j], dp[i - 1][j - w[i]] + v[i]);
				if (i == n) ans = max(ans, dp[i][j]);
			}
		cout << ans << '\n';	
		
		return 0;
	}
	ll ans = 0;
	vector<vector<ll>> dp(n + 5, vector<ll>(s + 5, 0));
	
	for (int i = 1; i <= n; i++)
	{
		for (int j = 0; j <= s; j++)
		{
			dp[i][j] = dp[i - 1][j];
			for (ll c = 1; c <= min(s, k[i]); c++)
				if (j - c * w[i] >= 0)
					dp[i][j] = max(dp[i][j], dp[i - 1][j - c * w[i]] + c * v[i]);
			if (i == n) ans = max(ans, dp[i][j]);
		}
	}
	
	cout << ans << '\n';

	return 0;
}

Compilation message (stderr)

knapsack.cpp: In function 'int main()':
knapsack.cpp:18:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   18 |   freopen("BALO.INP", "r", stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
knapsack.cpp:19:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   19 |   freopen("BALO.OUT", "w", stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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