Submission #1113254

#	Time	Username	Problem	Language	Result	Execution time	Memory
1113254		Yang8on	Knapsack (NOI18_knapsack)	C++17	0 / 100	3 ms	504 KiB

knapsack

#include <bits/stdc++.h>
#define file "main"
#define maxn (int) 3e6 + 5
#define ll long long
#define pii pair<ll, int>
#define fi(i, a, b) for(int i = a; i <= b; i ++)
#define fid(i, a, b) for(int i = a; i >= b; i --)

using namespace std;

int S, n, N;
pii a[maxn];
ll dp[2005];

int main() {
    freopen(file".inp", "r", stdin);

    ios::sync_with_stdio(false);
    cin.tie(0);

    cin >> S >> n;
    fi(i, 1, n) {
        int v, w, k; cin >> v >> w >> k;
        for(int tmp = 1; tmp <= k; tmp *= 2) {
            int nw_v = v * tmp, nw_w = w * tmp;
            if(nw_w <= S) a[++N] = { nw_v, nw_w };
            k -= tmp;
        }
        if(k) {
            int nw_v = v * k, nw_w = w * k;
            if(nw_w <= S) a[++N] = { nw_v, nw_w };
        }
    }

    memset(dp, -0x3f, sizeof dp);
    dp[0] = 0;

    fi(i, 1, N) {
        fid(j, S, a[i].second) {
            dp[j] = max(dp[j], dp[j - a[i].second] + a[i].first);
        }
    }

    cout << *max_element(dp + 0, dp + S + 1);

    return 0;
}

Compilation message (stderr)

knapsack.cpp: In function 'int main()':
knapsack.cpp:16:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   16 |     freopen(file".inp", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 12
• Subtask 2: 0 / 17
• Subtask 3: 0 / 20
• Subtask 4: 0 / 24
• Subtask 5: 0 / 27