Submission #946722

#	Time	Username	Problem	Language	Result	Execution time	Memory
946722		hellowinchang1029	Knapsack (NOI18_knapsack)	C++17	12 / 100	1091 ms	348 KiB

knapsack

#include<bits/stdc++.h>
using namespace std;
 
#define ll long long
#define pb push_back
#define pii pair<int, int>
#define pll pair<ll, ll>
#define vvi vector<vector<int>>
#define vt vector
#define arr array
#define ALL(x) begin(x), end(x)
#define rALL(x) rbegin(x), rend(x)
const int MOD1=998244353;
const int MOD2=1e9+7;
const ll LINF=1e18;
const int INF=1e9;

int main(){
    ios::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    
    ll s, n;
    cin>>s>>n;
    vt<arr<ll, 3>> items, use_items;
    for (int i=0; i<n; i++){
    	ll v, w, k;
    	cin>>v>>w>>k;
    	items.pb({v, w, k});
    }
    sort(ALL(items), [](arr<ll, 3> l, arr<ll, 3> r){
    	if (l[1]==r[1]) return l[0]>r[0];
    	return l[1]<r[1];
    });
    
    map<ll, ll> mp;
    for (int i=0; i<n; i++){
    	ll value=items[i][0], weight=items[i][1], total=items[i][2];
    	if (mp[weight] * weight > s) continue;
    	
    	mp[weight]+=total;
    	use_items.pb({value, weight, total});
    }
    
    swap(use_items, items);
    vt<ll> dp(s+1, 0);
    for (int i=0; i<n; i++){
    	ll value=items[i][0], weight=items[i][1], total=items[i][2];
    	for (int j=s; j>=0; j--){
    		ll cnt=0;
    		while(cnt <= total && cnt * weight <= j){
    			dp[j]=max(dp[j], dp[j - cnt * weight] + value * cnt);
    			cnt++;
    		}
    	}
    }
    cout<<dp[s]<<'\n';
    
    return 0;
}

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