Submission #994015

#	Time	Username	Problem	Language	Result	Execution time	Memory
994015		roadster	Knapsack (NOI18_knapsack)	C++17	73 / 100	1094 ms	2908 KiB

knapsack

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

using vi = vector<int>;
using vvi = vector<vector<int> >;
using pi = pair<int, int>;
using ll = long long;

#define sz(x) (int)(x).size()
#define all(x) (x).begin(), (x).end()
#define f first
// #define s second
#define pb push_back

const ll MOD = 1e9 + 7;
ll expo(ll x, ll n) {
    ll res = 1LL;
    while (n) {
           if (n % 2){ res = res * x % MOD; }
        x = x * x % MOD;
        n /= 2;
    }
    return res;
}

vector<ll> factorial(int n) {
    vector<ll> fact(n + 1);
    fact[0] = 1;
    for (int i = 1; i <= n; i++) { fact[i] = fact[i - 1] * i % MOD; }
    return fact;
}

vector<ll> mod_inverse(int n, ll fact_n) {
    vector<ll> inv(n + 1);
    inv[n] = expo(fact_n, MOD - 2);
    for (int i = n; i >= 1; i--) {
        inv[i - 1] = inv[i] * i % MOD;
    }
    return inv;
}

void setIO(string s) {
    freopen((s + ".in").c_str(), "r", stdin);
    freopen((s + ".out").c_str(), "w", stdout);
}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    // your code goes here
    int s, n;
    cin >> s >> n;
    vi v(n+1), w(n+1), k(n+1);
    for (int i = 1; i <= n; i++) cin >> v[i] >> w[i] >> k[i];

    vector<vector<ll>> dp(2, vector<ll> (s+1));
    
    for (int i = 1; i <= n; i++) {
        int now = i % 2;
        int last = 1 - now;
        for (int j = 0; j <= s; j++) {
            dp[now][j] = 0;
            for (int l = 0; j - l * w[i] >= 0 && l <= k[i]; l++) {
                dp[now][j] = max(dp[now][j], dp[last][j-l*w[i]] + 1LL * l * v[i]);
            }
        }
    }

    ll res = 0LL;
    for (int i = 0; i <= s; i++) {
        res = max(res, dp[n%2][i]);
    }

    cout << res << "\n";
    return 0;
}

Compilation message (stderr)

knapsack.cpp: In function 'void setIO(std::string)':
knapsack.cpp:43:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   43 |     freopen((s + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
knapsack.cpp:44:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   44 |     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: 0 / 27