Submission #557447

#	Time	Username	Problem	Language	Result	Execution time	Memory
557447		Soul234	Knapsack (NOI18_knapsack)	C++14	0 / 100	24 ms	31848 KiB

knapsack

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

void DBG() { cerr << "]\n"; }
template<class H, class... T> void DBG(H h, T... t) {
    cerr << h; if(sizeof...(t)) cerr << ", ";
    DBG(t...);
}
#ifdef LOCAL
#define dbg(...) cerr << "[" << #__VA_ARGS__ << "]: [", DBG(__VA_ARGS__)
#else
#define dbg(...) 0
#endif // LOCAL

#define FOR(i,a,b) for(int i = (a) ; i<(b) ; i++)
#define F0R(i,a) FOR(i,0,a)
#define ROF(i,a,b) for(int i = (b)-1 ; i>=(a) ; i--)
#define R0F(i,a) ROF(i,0,a)
#define each(e,a) for(auto &e : (a))
#define sz(v) (int)(v).size()
#define all(v) (v).begin(),(v).end()
#define rall(v) (v).rbegin(),(v).rend()
#define pb push_back
#define tcT template<class T
#define nl "\n"

using ll = long long;
using vi = vector<int>;
using pi = pair<int,int>;
using str = string;
tcT> using V = vector<T>;
tcT> using pqg = priority_queue<T,vector<T>,greater<T>>;

void setIO(string NAME = "") {
    cin.tie(0)->sync_with_stdio(0);
    if(sz(NAME)) {
        freopen((NAME + ".inp").c_str(),"r",stdin);
        freopen((NAME + ".out").c_str(),"w",stdout);
    }
}

tcT> bool ckmax(T&a, const T&b) {
    return b > a ? a = b, 1 : 0;
}

const int MX = 2001;
const ll INF = 1e18;
int S, N;
V<pi> items[MX];
ll dp[MX+5][MX];

void solve() {
    cin>>S>>N;
    F0R(i,N) {
        int V, W, K;
        cin>>V>>W>>K;
        items[W].pb({V, K});
    }
    memset(dp, -0x3f, sizeof dp);
    dp[0][0] = 0;
    FOR(i,1,MX) {
        sort(rall(items[i]));
        F0R(j,MX) {
            dp[i][j] = dp[i-1][j];
            ll val = 0;
            for(int amt = 0, pt = 0, used = 0; j-i*(amt+1) >= 0 && pt < sz(items[i]); ) {
                amt++;
                val += items[i][pt].first;
                if(dp[i-1][j-i*(amt+1)] >= 0) {
                    ckmax(dp[i][j], dp[i-1][j-i*(amt+1)] + val);
                }
                used++;
                if(used == items[i][pt].second) {
                    used = 0;
                    pt++;
                }
            }
        }
    }
    ll ans = -INF;
    F0R(i, S+1) ckmax(ans, dp[MX-1][i]);
    cout << ans << nl;
}

int main() {
    setIO();

    int t=1;
    //cin>>t;
    while(t-->0) {
        solve();
    }

    return 0;
}

Compilation message (stderr)

knapsack.cpp: In function 'void setIO(std::string)':
knapsack.cpp:37:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   37 |         freopen((NAME + ".inp").c_str(),"r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
knapsack.cpp:38:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   38 |         freopen((NAME + ".out").c_str(),"w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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