Submission #677282

#	Time	Username	Problem	Language	Result	Execution time	Memory
677282		airths	Knapsack (NOI18_knapsack)	C++17	100 / 100	98 ms	9952 KiB

knapsack

/*
 * 
 * 	^v^
 * 
 */
#include <iostream>
#include <string>
#include <cmath>
#include <vector>
#include <iomanip>
#include <map>
#include <algorithm>
#include <set>
#include <queue>
#include <climits>
#include <cstdlib>
#include <chrono>
// #include <ext/pb_ds/assoc_container.hpp>
// #include <ext/pb_ds/tree_policy.hpp>
// using namespace __gnu_pbds;
using namespace std;
// #define ordered_set tree<int, null_type, less<int>, rb_tree_tag, tree_order_statistics_node_update>
#define iamtefu ios_base::sync_with_stdio(false); cin.tie(0);
#define ll long long int
#define ld long double
#define fl(i,a,n) for (int i(a); i<n; i++)
#define rfl(i,a,n) for (int i(n-1); i>=a; i--)
#define print(a) for (auto x:a){cout<<x<<" ";} cout<<"\n";
#define tt int tt; cin>>tt; for(;tt--;)
template <typename T1, typename T2>
decltype(auto) max(T1 a, T2 b){return (a>b?a:b);}
template <typename T1, typename T2>
decltype(auto) min(T1 a, T2 b){return (a<b?a:b);}
int gcd(int a, int b){
	if (b==0){
		return a;
	}
	return gcd(b, a%b);
}
int pw(int a, int b, int m){
	int res=1;
	a%=m;
	while (b){
		if (b&1){
			res=(res*a)%m;
		}
		a=(a*a)%m;
		b>>=1;
	}
	return res;
}
void scn(){
	int n, s; cin>>s>>n;
	vector <vector <vector <int>>> huh(s+1);
	fl(i,0,n){
		int v, w, k; cin>>v>>w>>k;
		huh[w].push_back({v, k});
	}
	for (auto &x:huh){
		sort(x.rbegin(), x.rend());
	}
	vector <vector <int>> eheh;
	fl(i,1,s+1){
		int sz = (s+i-1)/i;
		for (auto x:huh[i]){
			if (sz==0){
				break;
			}
			int jk = min(sz, x[1]);
			while (jk){
				jk--;
				eheh.push_back({x[0], i});
			}
			sz-=(min(sz, x[1]));
		}
	}
	huh.clear();
	vector <int> dp(s+1);
	dp[0]=1;
	fl(i,1,eheh.size()+1){
		rfl(j,0,s+1){
			if (j>=eheh[i-1][1] && dp[j-eheh[i-1][1]]){
				dp[j]=max(dp[j], dp[j-eheh[i-1][1]]+eheh[i-1][0]);
			}
		}
	}
	// print(dp)
	cout<<*max_element(dp.begin(), dp.end())-1<<'\n';
}
int main(){
	iamtefu;
	#if defined(airths)
		auto t1=chrono::high_resolution_clock::now();
		freopen("in", "r", stdin);
		freopen("out", "w", stdout);
	#else
		//
	#endif
	// tt
	{
		scn();
	}
	#if defined(airths)
		auto t2=chrono::high_resolution_clock::now();
		ld ti=chrono::duration_cast<chrono::nanoseconds>(t2-t1).count();
		ti*=1e-6;
		cerr<<"Time: "<<setprecision(12)<<ti;
		cerr<<"ms\n";
	#endif
	return 0;
}

Compilation message (stderr)

knapsack.cpp: In function 'void scn()':
knapsack.cpp:26:35: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   26 | #define fl(i,a,n) for (int i(a); i<n; i++)
......
   80 |  fl(i,1,eheh.size()+1){
      |     ~~~~~~~~~~~~~~~~~              
knapsack.cpp:80:2: note: in expansion of macro 'fl'
   80 |  fl(i,1,eheh.size()+1){
      |  ^~

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