Submission #1086674

#	Time	Username	Problem	Language	Result	Execution time	Memory
1086674		quangminh412	Knapsack (NOI18_knapsack)	C++14	17 / 100	135 ms	262144 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 dp[n + 5][s + 5][s + 5];
		ll mx[n + 5][s + 5];
		memset(dp, sizeof(dp), 0);
		memset(mx, sizeof(mx), 0);
		
		ll ans = 0;
		for (int i = 1; i <= n; i++)
			for (int num = 0; num <= s; num++)
				for (int j = s; j >= 0; j--)
				{
					dp[i][num][j] = mx[i - 1][j];
					if (num > k[i]) continue;
					if (j - num * w[i] >= 0)
						dp[i][num][j] = max(dp[i][num][j], mx[i - 1][j - num * w[i]] + num * v[i]);
					mx[i][j] = max(mx[i][j], dp[i][num][j]);
					if (i == n) ans = max(ans, dp[i][num][j]);
				}
				
		cout << ans << '\n';

	return 0;
}

Compilation message (stderr)

knapsack.cpp: In function 'int main()':
knapsack.cpp:56:27: warning: 'memset' used with constant zero length parameter; this could be due to transposed parameters [-Wmemset-transposed-args]
   56 |   memset(dp, sizeof(dp), 0);
      |                           ^
knapsack.cpp:57:27: warning: 'memset' used with constant zero length parameter; this could be due to transposed parameters [-Wmemset-transposed-args]
   57 |   memset(mx, sizeof(mx), 0);
      |                           ^
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: 0 / 20
• Subtask 4: 0 / 24
• Subtask 5: 0 / 27