Submission #1137171

#	Time	Username	Problem	Language	Result	Execution time	Memory
1137171		hoa208	Knapsack (NOI18_knapsack)	C++20	100 / 100	132 ms	16900 KiB

knapsack

#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define FOR(i, a, b) for (int i = (a), _b = (b); i <= _b; i++)
#define FORD(i, b, a) for (ll i = (b), _a = (a); i >= _a; i--)
#define pa pair<ll, ll>
#define fi first
#define se second
#define bit(mask, j) ((mask >> j) & 1)
#define t_test int t;cin >> t;while(t--)
const ll mod = 1e9 + 7;
const ll INF = 1e17;
const ll N = 1e2 + 10;
const ll W = 2e3 + 10;
int S, n, m;
vector<pa> a, b;
vector<ll> g[W];
ll dp[W];
void hbmt() {
    // inp
    cin >> S >> n;
    FOR(i, 1, n) {
        ll v;
        int w, k;
        cin >> v >> w >> k;
        k = min(S / w, k);
        ll heso = 1, sum = 1;
        a.push_back({v, w});
        while(1) {
            heso *= 2;
            if(sum + heso > k) break;
            sum += heso;
            a.push_back({heso * v, heso * w});
        }        
        if(sum < k) {
            heso = k - sum;
            a.push_back({heso * v, heso * w});
        }
    }
    sort(a.begin(), a.end(), greater<pa>());
    for(auto e : a) {
        ll v = e.fi, w = e.se;
        if(g[w].size() > S / w) continue;
        g[w].push_back(v);
    }
    b.push_back({0, 0});
    FOR(i, 0, S) {
        for(auto v : g[i]) {
            b.push_back({v, i});
        }
    }
    FOR(i, 1, b.size() - 1) {
        ll v = b[i].fi;
        int w = b[i].se;
        FORD(j, S, w) {
            dp[j] = max(dp[j - w] + v, dp[j]);
        }
    }
    cout << dp[S];
    // slove
   // return subX::slove();
}

int main() {
    
    ios_base::sync_with_stdio(0);
    cin.tie(0);cout.tie(0);

    if(fopen("hbmt.inp", "r")) {
        freopen("hbmt.inp", "r", stdin);
        freopen("hbmt.out", "w", stdout);
    }
    
    // t_test 
    hbmt();
    return 0;
}

Compilation message (stderr)

knapsack.cpp: In function 'int main()':
knapsack.cpp:70:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   70 |         freopen("hbmt.inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
knapsack.cpp:71:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   71 |         freopen("hbmt.out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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