Submission #1047828

#	Time	Username	Problem	Language	Result	Execution time	Memory
1047828		Newtonabc	Knapsack (NOI18_knapsack)	C++14	100 / 100	43 ms	4100 KiB

knapsack

#include<bits/stdc++.h>
#define mp make_pair
using namespace std;
const int N=2e3+10;
vector<pair<int,int> > v;
vector<pair<int,pair<int,int> > > inp;
int dp[N],wg[N];
int main(){
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	int s,n;
	cin>>s >>n;
	for(int i=0;i<n;i++){
		int a,b,c;
		cin>>a >>b >>c;
		inp.push_back(mp(a,mp(b,c)));
		//value,weight,number
	}
	sort(inp.begin(),inp.end(),greater<pair<int,pair<int,int> > >());
	for(int i=0;i<n;i++){
		int val=inp[i].first,w=inp[i].second.first,num=inp[i].second.second;
		if(w>s) continue;
		while(wg[w]+w<=s && num){
			num--;
			wg[w]+=w;
			v.push_back(mp(val,w));
		}
	}
	for(int i=0;i<v.size();i++){
		int val=v[i].first,w=v[i].second;
		for(int j=s;j>=1;j--){
			if(j-w>=0) dp[j]=max(dp[j],dp[j-w]+val);
		}
	}
	cout<<dp[s];
}

Compilation message (stderr)

knapsack.cpp: In function 'int main()':
knapsack.cpp:29:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   29 |  for(int i=0;i<v.size();i++){
      |              ~^~~~~~~~~

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