Submission #1298253

#	Time	Username	Problem	Language	Result	Execution time	Memory
1298253		rexdino	Knapsack (NOI18_knapsack)	C++20	100 / 100	45 ms	2172 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 REP(i,a,b) for(int i=(a); i>=(b); --i)
#define umax(x, y) x = max(x, (y))
#define umin(x, y) x = min(x, (y))
#define BIT(x, i) (((x) >> (i)) & 1)
#define MASK(i) (1LL << (i))
#define sz(v) (int)(v).size()
#define ALL(v) (v).begin(),(v).end()
#define el cout << "\n"
using namespace std;

typedef long long ll;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;

const int N = 1e6 + 5;
const int mod = 1e9 + 7;
const int base = 311;
const ll INF = 1e18;

/// REXDINO FROM LTV HSGS ///
int S, n;
int v[N], w[N], k[N];
vector<int> order;
int used[N];
ll dp[N];


bool cmp(int x, int y){
    return v[x] > v[y];
}

void solve(){
    cin >> S >> n;
    FOR(i, 1, n) cin >> v[i] >> w[i] >> k[i], order.push_back(i);

    sort(ALL(order), cmp);

    for (int i : order){
        FOR(j, 1, k[i]) {
            if (used[w[i]] * w[i] > S) break;

            REP(t, S, w[i]){
                umax(dp[t], dp[t - w[i]] + v[i]);
            }

            used[w[i]]++;
        }
    }

    cout << dp[S], el;
}

signed main(){
    #define NAME "main"
    if (fopen(NAME".inp", "r")){
        freopen(NAME".inp", "r", stdin);
        freopen(NAME".out", "w", stdout);
    }
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);

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

    return 0;
}

Compilation message (stderr)

knapsack.cpp: In function 'int main()':
knapsack.cpp:60:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   60 |         freopen(NAME".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
knapsack.cpp:61:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   61 |         freopen(NAME".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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