Submission #883822

#	Time	Username	Problem	Language	Result	Execution time	Memory
883822		PieArmy	Knapsack (NOI18_knapsack)	C++14	12 / 100	1 ms	616 KiB

knapsack

#include <bits/stdc++.h>
typedef long long ll;
#define yem(re) (1ll<<(ll(re)))
#define endl '\n'
#define pb push_back
#define int long long
#define mid ((left+right)/2)
#define L(emanuelLasker,joseRaulCapablanca,anatolyKarpov) for(int emanuelLasker=(joseRaulCapablanca);emanuelLasker<=(anatolyKarpov);emanuelLasker++)
#define R(magnusCarlsen,paulMorphy,bobbyFischer) for(int magnusCarlsen=(paulMorphy);magnusCarlsen>=(bobbyFischer);magnusCarlsen--)
#define cint(vladimirKramnik) int vladimirKramnik;cin>>vladimirKramnik
#define inf (2e18+5)
#define sc second
#define fr first
#define Bismillahirrahmanirrahim ios_base::sync_with_stdio(false);cin.tie(NULL);
#define cinarr(mikhailTal) for(auto &garryKasparov:mikhailTal)cin>>garryKasparov;
#define all(mustafaKemalAtaturk) mustafaKemalAtaturk.begin(),mustafaKemalAtaturk.end()

using namespace std;
mt19937 rng(chrono::high_resolution_clock().now().time_since_epoch().count());

void code(){
	int n,k;cin>>k>>n;
	vector<pair<int,pair<int,int>>>v;
	L(i,0,n-1){
		cint(val);cint(cos);cint(num);
		v.pb({val,{cos,num}});
	}
	sort(all(v));
	vector<int>dp(k+1,-1);
	dp[0]=0;
	R(i,n-1,0){
		vector<int>dp2(k+1,-1);
		int val=v[i].fr,cos=v[i].sc.fr,num=v[i].sc.sc;
		L(j,0,k)dp2[i]=dp[i];
		L(j,0,k){
			if(dp[j]==-1)continue;
			int x=min(ll((k-j)/cos),num);
			dp2[j+(x*cos)]=max(dp2[j+(x*cos)],dp[j]+(x*val));
		}
		swap(dp2,dp);
	}
	int ans=0;
	for(int x:dp)ans=max(x,ans);
	cout<<ans;
}

int32_t main(){
    Bismillahirrahmanirrahim
	int t=1;
    bool usaco=0;
    if(usaco){freopen(".in","r",stdin);freopen(".out","w",stdout);}
	if(!t)cin>>t;
	while(t--){code();cout<<endl;}
	return 0;
}
//Haven't checked tutorial yet...

Compilation message (stderr)

knapsack.cpp: In function 'int32_t main()':
knapsack.cpp:51:22: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   51 |     if(usaco){freopen(".in","r",stdin);freopen(".out","w",stdout);}
      |               ~~~~~~~^~~~~~~~~~~~~~~~~
knapsack.cpp:51:47: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   51 |     if(usaco){freopen(".in","r",stdin);freopen(".out","w",stdout);}
      |                                        ~~~~~~~^~~~~~~~~~~~~~~~~~~

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