Submission #976277

#	Time	Username	Problem	Language	Result	Execution time	Memory
976277		vjudge1	Knapsack (NOI18_knapsack)	C++17	100 / 100	59 ms	38236 KiB

knapsack

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define pb push_back
#define fi first
#define sec second
#define pii pair<ll,ll>
 
const ll N = 1e5 + 5;

signed main(){
	ios_base::sync_with_stdio(false); cin.tie(nullptr);
	ll tc = 1;
	// cin >> tc;
	while(tc--){
		ll s,n; cin >> s >> n;
		vector<ll>v(n+5), w(n+5), k(n+5);
		vector<pii>vec[s+5];
		for(int i=1;i<=n;i++){
			ll a,b,c; cin >> a >> b >> c;
			vec[b].pb({a,c});
		}
		for(int i=1;i<=s;i++) sort(vec[i].begin(), vec[i].end(), greater<pii>());
		vector<vector<ll>>dp(s+5, vector<ll>(s+5));
		for(int i=1;i<=s;i++){
			for(int j=1;j<=s;j++){
				dp[i][j] = dp[i-1][j];
				if(vec[i].size() == 0) continue;
				ll cnt = 0, cur = 0;
				for(auto x : vec[i]){
					if(cnt > j) break;
					ll tmp = x.sec;
					for(int k=0;k<x.sec;k++){
						cnt += i;
						cur += x.fi;
						if(cnt > j) break;
						dp[i][j] = max(dp[i][j], dp[i-1][j-cnt] + cur);
					}
				}
			}
		}
		// for(int i=1;i<=s;i++){
			// for(int j=1;j<=s;j++) cout << dp[i][j] << " ";
			// cout << endl;
		// }
		cout << dp[s][s] << endl;
	}
}

Compilation message (stderr)

knapsack.cpp: In function 'int main()':
knapsack.cpp:32:9: warning: unused variable 'tmp' [-Wunused-variable]
   32 |      ll tmp = x.sec;
      |         ^~~

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