Submission #1275656

#	Time	Username	Problem	Language	Result	Execution time	Memory
1275656		almaz	Knapsack (NOI18_knapsack)	C++20	73 / 100	1096 ms	2796 KiB

knapsack

#include <bits/stdc++.h>
using namespace std;

#define int long long
// #define endl '\n'
#define ff first
#define ss second
#define pb push_back
#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()
#define ar array

const int MOD = 1e9 + 7,INF = 1e18, N = 2e5 + 5;
/*
5 2
1 2 2
2 3 2
3 4 2
4 5 2
*/

void solve(){
	int s , n;
	cin >> s >> n;
	
	vector <int> v(n) , w(n) , k(n);
	
	int sum = 0;
	
	for(int i = 0;i < n;i++){
		cin >> v[i] >> w[i] >> k[i];
		sum += w[i] * k[i];
	}
	
	sum = min(s, sum);
	
	vector <int> dp(sum + 1, 0);
	vector <int> use(sum + 1);
	int cnt = 0;
	for(int i = 1;i <= 100000;i++){
		for(int j = 1;j <= 2000;j++){
			cnt++;
		}
	}
	
	dp[0] = 0;
	for(int i = 0;i < n;i++){
		int x = 1;
		k[i] = min(k[i] ,1ll * 2000);

		while(k[i] > 0){
			int z = min(x , k[i]);
			for(int j = sum;j >= (w[i] * z);j--){
				dp[j] = max(dp[j] , dp[j - (w[i] * z)] + (v[i] * z));
			}
			k[i] -= z;
			x *= 2;
		}
		// cout<<cnt<<endl;
	}
	int ans = 0;
	for(int i = 0;i <= sum;i++){
		// cout<<dp[i]<<' ';
		if(dp[i] != INF){
			ans = max(ans , dp[i]);
		}
	}
	// cout<<endl;
	cout<<ans<<endl;
}

signed main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int ti = 1;
    while (ti--) {
		solve();
    }
}

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