Submission #815518

#	Time	Username	Problem	Language	Result	Execution time	Memory
815518		winthemcut3	Knapsack (NOI18_knapsack)	C++14	73 / 100	1086 ms	17748 KiB

knapsack

#include <bits/stdc++.h>
#define FastIO ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0)
#define ll long long
#define PB push_back
#define ALL(v) (v).begin(), (v).end()
#define FOR(i, a, b) for (int i = (a), _b = (b); i <= _b; i++)
#define FORD(i, b, a) for (int i = (b), _a = (a); i >= _a; i--)
#define fi   first
#define se   second
#define BIT(x, i) (((x) >> (i)) & 1)
using namespace std;

/** END OF TEMPLATE **/

const int mxN = 1e5 + 5;
struct item {
    ll v, w;
};
ll n, s, dp[2005];
int main()
{
    FastIO;
    //freopen(".inp", "r", stdin);
    //freopen(".out", "w", stdout);
    cin >> s >> n;
    vector<item> a;
    FOR(i, 1, n) {
        ll v, w, cnt;
        cin >> v >> w >> cnt;
        ll t = 1;
        while(cnt >= t) {
            if(t*w <= s) a.PB({t*v, t*w});
            cnt -= t;
            t <<= 1;
        }
        if(cnt) if(cnt*w <= s) a.PB({cnt*v, cnt*w});
    }
    FOR(i, 0, a.size()-1) {
        FORD(j, s, a[i].w)
            dp[j] = max(dp[j], dp[j - a[i].w] + a[i].v);
    }
    cout << dp[s];
    return 0;
}

/*

*/

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