Submission #1277028

#	Time	Username	Problem	Language	Result	Execution time	Memory
1277028		vibeduck	Knapsack (NOI18_knapsack)	C++20	73 / 100	210 ms	327680 KiB

knapsack

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

#define pb push_back
#define pf push_front
#define mp make_pair
#define fi first
#define se second
#define int long long
#define all(x) (x).begin(), (x).end()

typedef long double ld;
typedef long long ll;
typedef pair<ll,ll> pll;
typedef pair<int,int> pii;
typedef vector<int> vi;
typedef vector<ll> vll;
typedef vector<bool> vb;
typedef vector<vector<int>> vvi;
typedef vector<vector<bool>> vvb;
typedef vector<vector<ll>> vvll;
typedef vector<string> vs;
typedef vector<vector<string>> vvs;
typedef vector<char> vc;
typedef vector<vector<char>> vvc;
typedef map<int, int> mii;
typedef unordered_map<int, int> umii;

const int mod = 1e9 + 7;
const int inf = INTMAX_MAX;
const bool tc = false;

int s, n;
const int mxn = 1e5 + 1, mxs = 2001;
int v[mxn], w[mxn], k[mxn];
int dp[mxn][mxs];

inline void solve() {
    cin >> s >> n;
    for (int i = 0; i < n; i++) {
        cin >> v[i] >> w[i] >> k[i];
        k[i] = min(k[i], (int)2000);
    }
    for (int i = 1; i <= k[0]; i++) {
        if (w[0] * i > s) break;
        dp[0][s - w[0] * i] = i * v[0];
    }
    for (int i = 1; i < n; i++) {
        for (int j = 0; j <= s; j++) {
            for (int l = 0; l <= k[i]; l++) {
                // ith, j weight left, l taken of rn
                if (j + l * w[i] > s) break;
                dp[i][j] = max(dp[i][j], dp[i - 1][j + l * w[i]] + l * v[i]);
            }
        }
    }

    // for (int i = 0; i < n; i++) {
    //     cout << i << ": ";
    //     for (int j = 0; j <= s; j++) cout << dp[i][j] << " ";
    //     cout << '\n';
    // }

    int ans = 0;
    for (int i = 0; i <= s; i++) ans = max(ans, dp[n - 1][i]);

    cout << ans << '\n';
}

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

signed main() {
    ios::sync_with_stdio(false);
    cout.tie(0);
    cin.tie(0);
    //setIO();

    int t = 1;
    if (tc) {
        cin >> t;
    }

    while (t--) {
        solve();
    }
}

Compilation message (stderr)

knapsack.cpp: In function 'void setIO(std::string)':
knapsack.cpp:71:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   71 |     freopen((s + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
knapsack.cpp:72:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   72 |     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