Submission #1043771

#	Time	Username	Problem	Language	Result	Execution time	Memory
1043771		vjudge1	Knapsack (NOI18_knapsack)	C++17	100 / 100	50 ms	2136 KiB

knapsack

#include <bits/stdc++.h>
using namespace std;
 
#define ll long long
#define ld long double
#define pii pair<int, int>
#define pll pair<ll, ll>
#define pld pair<ld, ld>
#define pb push_back
#define fi first
#define se second
#define debug(x) cerr << #x << " => " << x << endl
#define all(x) x.begin(),x.end()

int main()
{
	ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
	int s,n;cin>>s>>n;
	pair<int,pii> p[n];
	for(int i=0;i<n;i++) cin>>p[i].se.fi>>p[i].fi>>p[i].se.se;
	sort(p,p+n,greater<pair<int,pii>>());
	vector<pll> a;
	int now=s,cnt=0;
	for(int i=0;i<n;i++)
	{
		if(p[i].fi!=now) now=p[i].fi,cnt=0;
		while(cnt!=s/now && p[i].se.se!=0)
		{
			a.pb({p[i].fi,p[i].se.fi});
			p[i].se.se--;
			cnt++;
		}
	}

	ll dp[2][s+1];
	memset(dp,0,sizeof(dp));
	for(int i=0;i<a.size();i++)
	{
		for(int j=0;j<=s;j++)
		{
			dp[i%2][j]=max(dp[i%2][j],dp[(i+1)%2][j]);
			if(j+a[i].fi<=s) dp[i%2][j+a[i].fi]=max(dp[i%2][j+a[i].fi],dp[(i+1)%2][j]+a[i].se);
		}
		// for(int j=0;j<=s;j++) cout<<dp[i%2][j]<<' ';cout<<'\n';
	}
	cout<<dp[(a.size()-1)%2][s];
	return 0;
}

Compilation message (stderr)

knapsack.cpp: In function 'int main()':
knapsack.cpp:37:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   37 |  for(int i=0;i<a.size();i++)
      |              ~^~~~~~~~~

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