Submission #330040

#	Time	Username	Problem	Language	Result	Execution time	Memory
330040		oak	Knapsack (NOI18_knapsack)	C++14	100 / 100	97 ms	5100 KiB

knapsack

#include<bits/stdc++.h>
using namespace std;
vector<pair<long long,int> > wei[2001],vc;
long long dp[2001];
int main(){
	int n,s,i,j,w,k;
	long long v;
	scanf("%d %d",&s,&n);
	for(i=0;i<n;i++){
		scanf("%lld %d %d",&v,&w,&k);
		wei[w].push_back(make_pair(v,k));
	}
	for(i=1;i<=s;i++){
		sort(wei[i].begin(),wei[i].end(),greater<pair<long long,int> >());
		int remain = s/i;
		for(j = 0; j<wei[i].size() && remain >0; j++){
			int sel = min(remain,wei[i][j].second);
			remain -= sel;
			while(sel--)vc.push_back(make_pair(wei[i][j].first,i));
		}
	}
	for(i=0;i<vc.size();i++){
		for(j = s;j >= vc[i].second;j--){
			dp[j] = max(dp[j],dp[j-vc[i].second] + vc[i].first);
		}
	}
	printf("%lld",dp[s]);
}

Compilation message (stderr)

knapsack.cpp: In function 'int main()':
knapsack.cpp:16:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<long long int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   16 |   for(j = 0; j<wei[i].size() && remain >0; j++){
      |              ~^~~~~~~~~~~~~~
knapsack.cpp:22:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<long long int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   22 |  for(i=0;i<vc.size();i++){
      |          ~^~~~~~~~~~
knapsack.cpp:8:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    8 |  scanf("%d %d",&s,&n);
      |  ~~~~~^~~~~~~~~~~~~~~
knapsack.cpp:10:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   10 |   scanf("%lld %d %d",&v,&w,&k);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~

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