Submission #1224825

#	Time	Username	Problem	Language	Result	Execution time	Memory
1224825		bounce_29	Knapsack (NOI18_knapsack)	C++20	73 / 100	1097 ms	16868 KiB

knapsack

#include <bits/stdc++.h>
using namespace std; 
#define ll long long
#define vll vector<long long>
#define pb push_back
#define endll "\n"
#define vvll vector<vector<long long>>
const int MOD = 1e9 + 7;
#define rep(i, a , n) for (int i = a; i < (n); i++)
#define nrep(i, n , a) for (int i = n-1; i >= (a); i--)

void solve()
{
    ll s, n; cin >> s >> n;
    vector<pair<ll, ll>> items;
    rep (i, 0, n) {
        ll value, weight, count;
        cin >> value >> weight >> count;
        ll j(1);
        while (j<= count){
            ll curr_val = value * j;
            ll curr_weight = weight * j;
            if (curr_weight > s) break;
            items.pb({curr_val, curr_weight});
            count -= j;
            j *= 2;
        }
        if (count > 0) {
            ll curr_val = value * count;
            ll curr_weight = weight * count;
            if (curr_weight <= s) {
                items.pb({curr_val, curr_weight});
            }
        }
    }
    vll dp(s+1, 0);

    for (auto item: items) {
        
        ll value = item.first, weight = item.second;
        nrep (i, s+1, weight){
            dp[i] = max(dp[i], dp[i - weight] + value);
        }
        
    }
    cout << dp[s] << endll;
}

int main()
{
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    solve();
    return 0;
}

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