Submission #464857

#	Time	Username	Problem	Language	Result	Execution time	Memory
464857		Qw3rTy	Knapsack (NOI18_knapsack)	C++11	73 / 100	1081 ms	15872 KiB

knapsack

#pragma GCC optimize(2)
#pragma GCC optimize(3)
#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
#include <bits/stdc++.h>
#define int long long
#define pi pair<int,int>
#define fi first
#define se second
using namespace std;

const int maxN = 1e5+5;
const int maxV = 2e3+5;
int cnt = 0;
pi item[maxN*30]; //.fi = value; .se = weight;
int f[maxV];
int S,N;

bool cmp(pi a, pi b){
	return a.se < b.se;
}

signed main(){
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	//freopen("../test.in","r",stdin);
	cin >> S >> N;
	for(int i = 1; i <= N; ++i){
		int v,w,k; cin >> v >> w >> k;
		for(int j = 1; j <= k; j <<= 1){
			if(w * j > S)break;
			item[++cnt] = pi(v*j,w*j);
			k -= j;
		}
		if(k > 0 && w * k <= S)item[++cnt] = pi(v*k,w*k);
	}
	sort(item+1,item+cnt+1,cmp);
	for(int i = 1; i <= cnt; ++i){
		if(item[i].se > S)break;
		for(int j = S; j >= item[i].se; --j){
			if(f[j-item[i].se] + item[i].fi > f[j])
				f[j] = f[j-item[i].se] + item[i].fi;
		}
	}
	cout << f[S] << '\n';
}

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