제출 #1256309

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1256309		Mikael639	Knapsack (NOI18_knapsack)	C++20	100 / 100	40 ms	1352 KiB

knapsack

#include <bits/stdc++.h>

#define fi first
#define se second

#define For(i, a, b) for (int i = (a); i <= (b); ++i)
#define ForD(i, a, b) for (int i = (a); i >= (b); --i)
#define rep(i, n) for (int i = 0; i < (n); ++i)
#define repD(i, n) for (int i = (n) - 1; i >= 0; --i)
#define coutE(x) {cout << x << '\n'; return;}
#define pb push_back
#define pf push_front

#define all(x) x.begin(), x.end()
#define sz(x) (int)x.size()
#define bs binary_search
#define ub upper_bound
#define lb lower_bound

#define endl '\n'

#define db long double
#define ll long long
#define ii pair<int, int>
#define vi vector<int>
#define vii vector<ii>

#define int long long

using namespace std;

void file(string s){

    if (s.empty()) return;

    freopen((s + ".inp").c_str(), "r", stdin);
    freopen((s + ".out").c_str(), "w", stdout);
}

template <class X, class Y>
bool minimize(X &x, Y y){
   if (x > y) return x = y, 1;
   return 0;
}

template <class X, class Y>
bool maximize(X &x, Y y){
   if (x < y) return x = y, 1;
   return 0;
}

mt19937_64 rng(time(0));

const int N = 1e6 + 5;

const int MOD = 1e9 + 7; //998244353;
const int INF = 1e9;
const long long LINF = 1e18;

const int dx[] = {1, 0, 0, -1};
const int dy[] = {0, 1, -1, 0};

int s, n; 
multiset<int> st[5005];

void Add(int nw, int nv){
    if (sz(st[nw]) <= s/nw) st[nw].insert(nv);
    else{
        if (*st[nw].begin() < nv){
            st[nw].erase(*st[nw].begin());
            st[nw].insert(nv);
        }
    }
}

void solve(){

    cin >> s >> n;
    rep(i, n){
        int v, w, k; cin >> v >> w >> k;
        minimize(k, s/w + 1);

        for (int b = 1; b <= k; k -= b, b <<= 1){
            Add(w * b, v * b);
        }
        
        if (k){
            Add(w * k, v * k);
        }
    }

    vi dp(s + 5, 0);
    int res = 0;
    For(i, 1, s){
        for (int v: st[i]){
            ForD(j, s, i){
                maximize(dp[j], dp[j - i] + v);
            }
        }
        maximize(res, dp[i]);
    }

    cout << res;
}

signed main(){

    ios_base::sync_with_stdio(0); 
    cin.tie(0); cout.tie(0);
    file("");

    int T = 1;
    //cin >> T;
    while (T--) solve();

    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

knapsack.cpp: In function 'void file(std::string)':
knapsack.cpp:36:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   36 |     freopen((s + ".inp").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
knapsack.cpp:37:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   37 |     freopen((s + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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