Submission #919698

#	Time	Username	Problem	Language	Result	Execution time	Memory
919698		ByeWorld	Knapsack (NOI18_knapsack)	C++14	73 / 100	123 ms	3664 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 = 110;
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];
pii dp[MAXN][MAXK];
vector <ipii> vec;

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];
        vec.pb({w[i], {v[i], k[i]}});
    }
    vec.pb({INF, {INF, INF}});
    sort(vec.rbegin(), vec.rend()); // sort max
    for(int j=1; j<=s; j++) dp[0][j] = {-INF, 0};

    for(int i=1; i<=n; i++){
        ipii tp = vec[i];
        //cout << tp.fi << ' ' << tp.se.fi << ' ' << tp.se.se << " p\n";

        for(int j=0; j<=s; j++){ // max value kalo udh di i, isinya j
            dp[i][j] = dp[i-1][j];
        }
        for(int j=0; j<=s; j++){
            for(int ba=1; ba<=tp.se.se; ba++){ // based on weight
                int wei = ba*tp.fi;
                if(j-wei < 0) break;

                int nw = dp[i-1][j-wei].fi + ba * tp.se.fi;
                if(dp[i][j].fi < nw){
                    dp[i][j].fi = nw;
                    dp[i][j].se = ba;
                    //cout << i <<  ' ' << j << ' ' << nw << ' ' << ba << " pp\n";
                } 

            }
        }
    }

    int mx = -INF;
    for(int i=0; i<=s; i++) mx = max(mx, dp[n][i].fi);
    cout << mx << '\n';
}

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