Submission #919707

#	Time	Username	Problem	Language	Result	Execution time	Memory
919707		ByeWorld	Knapsack (NOI18_knapsack)	C++14	100 / 100	41 ms	7308 KiB

knapsack

#include <bits/stdc++.h>
#pragma GCC optimize("Ofast,unroll-loops")
#define bupol __builtin_popcount
#define int long long 
#define ll long long
#define ld long double
#define fi first
#define se second
#define pb push_back
#define lf (id<<1)
#define rg ((id<<1)|1)
#define md ((l+r)>>1)
using namespace std;
const int MAXN = 1e5+10;
const int MAXK = 2010;
const int LOG = 20;
const int MOD = 1e9+7;
const int SQRT = 520;
const int INF = 1e18;
typedef pair<int,int> pii;
typedef pair<int,pii> ipii;

int n, s;
int v[MAXN], w[MAXN], k[MAXN];
int dp[MAXK];
vector <pii> val[MAXK];

signed main(){
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    cin >> s >> n;
    for(int i=1; i<=n; i++){
        cin >> v[i] >> w[i] >> k[i];
        val[w[i]].pb({v[i], k[i]});
    }
    for(int i=1; i<=s; i++) dp[i] = -INF;
    for(int i=1; i<=s; i++){
        sort(val[i].rbegin(), val[i].rend());

        int tot = 0;
        for(auto [v, k] : val[i]){
            for(int p=1; p<=k && tot<=s; p++){
                for(int cur=s; cur>=i; cur--){ // build cur
                    dp[cur] = max(dp[cur], dp[cur-i]+v);
                }
                tot += i;
            }
        }
    }
    // for(int i=1; i<=s; i++){
    //     cout << i << ' '<< dp[i] << " dp\n";
    // }
    int mx = -INF;
    for(int i=1; i<=s; i++){
        mx = max(mx, dp[i]);
    }
    cout << mx << '\n';
}

Compilation message (stderr)

knapsack.cpp: In function 'int main()':
knapsack.cpp:40:18: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   40 |         for(auto [v, k] : val[i]){
      |                  ^

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