Submission #445810

#	Time	Username	Problem	Language	Result	Execution time	Memory
445810		Pulgster	Knapsack (NOI18_knapsack)	C++17	0 / 100	1 ms	332 KiB

knapsack

#pragma GCC optimize("Ofast")
#include "bits/stdc++.h"
// #include <ext/pb_ds/assoc_container.hpp>
// #include <ext/pb_ds/tree_policy.hpp>
// using namespace __gnu_pbds;
typedef long long ll;
using namespace std;

	#define sim template < class c
	#define ris return * this
	#define dor > debug & operator <<
	#define eni(x) sim > typename \
enable_if<sizeof dud<c>(0) x 1, debug&>::type operator<<(c i) {
	sim > struct rge { c b, e; };
	sim > rge<c> range(c i, c j) { return rge<c>{i, j}; }
	sim > auto dud(c* x) -> decltype(cerr << *x, 0);
	sim > char dud(...);
	struct debug {
			// #ifdef LOCAL
		~debug() { cerr << endl; }
		eni(!=) cerr << boolalpha << i; ris; }
		eni(==) ris << range(begin(i), end(i)); }
		sim, class b dor(pair < b, c > d) {
			ris << "(" << d.first << ", " << d.second << ")";
		}
		sim dor(rge<c> d) {
			*this << "[";
			for (auto it = d.b; it != d.e; ++it)
				*this << ", " + 2 * (it == d.b) << *it;
			ris << "]";
		}

			// sim dor(const c&) { ris; }
	};
	#ifdef ASJKD
}
	#endif
#define imie(...) " [" << #__VA_ARGS__ ": " << (__VA_ARGS__) << "] "
#define read(x) for(auto &i : (x)){cin>>i;}
#define all(x) begin(x), end(x)
#define pb push_back
#define pll pair<ll,ll>
#define pii pair<int,int>
// #define ordered_set tree<int, null_type,less<int>, rb_tree_tag,tree_order_statistics_node_update>
int mod = 1e9+7;
int INF = 1e9+1e8;
ll INF64 = 1e18;
ll binpow(ll a, ll b, ll mod){
	ll res = 1;
	while(b > 0){
		if(b % 2){
			res = res * a % mod;
		}
		a = a * a % mod;
		b >>= 1;
	}

	return res;
}

void mxself(int &a, int b){
	a = max(a, b);
}
void rpii(pii &a){
	cin>>a.first>>a.second;
}
void mnself(int &a,int b){
	a = min(a, b);
}
void mult(ll &a, ll b){
	a = a * b % mod;
}
void add(ll &a, ll b){
	a = (a + b);
	while(a >= mod) a -= mod;
}
void setIO(string s){
	freopen((s + ".in").c_str(), "r", stdin);
	freopen((s + ".out").c_str(), "w", stdout);
}
void test_case(int test){
	int s, n;
	cin>>s>>n;
	vector<int> v(n);
	vector<int> w(n);
	vector<int> q(n);
	for(int i=0;i<n;i++){
		cin>>v[i]>>w[i]>>q[i];
	}
	vector<ll> dp(s+1);
	for(int rep=0;rep<n;rep++){
		vector<int> mx(s+1);
		for(int i=0;i<=s;i++){
			if(i < w[rep]){
				mx[i] = i;
			} else{
				int last = mx[i-w[rep]];
				int h = min(q[rep], i - last);
				if(h * v[rep] + dp[last]  < dp[i]){
					mx[i] = i;
				} else{
					mx[i] = mx[i-w[rep]];
					dp[i] = dp[last] + h * v[rep];
				}
			}
		}
		for(int i=1;i<=s;i++){
			dp[i] = max(dp[i], dp[i-1]);
		}
	}
	ll ans = 0;
	for(int i=s;i>=0;i--){
		ans = max(ans, dp[i]);
	}
	cout<<ans<<'\n';
}	

int main(){
	cin.tie(0);
	cout.tie(0);
	ios_base::sync_with_stdio(false);
	int t=1;
	// setIO("feast"); 	
	// cin>>t;
	for(int test=1;test<=t;test++){
		test_case(test);
	}
	return 0;
}

Compilation message (stderr)

knapsack.cpp: In function 'void setIO(std::string)':
knapsack.cpp:78:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   78 |  freopen((s + ".in").c_str(), "r", stdin);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
knapsack.cpp:79:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   79 |  freopen((s + ".out").c_str(), "w", stdout);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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