Submission #1225020

#	Time	Username	Problem	Language	Result	Execution time	Memory
1225020		thaocherry	Knapsack (NOI18_knapsack)	C++20	17 / 100	2 ms	328 KiB

knapsack

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
const ll lim = 2222;
ll n,x;
map<ll, vector<pair<ll,ll>>> g;
ll dp[lim];
void init()
{

    cin.tie(0);
    cout.tie(0);
    ios_base::sync_with_stdio(0);
}
bool cmp(pair<ll,ll> x, pair<ll,ll> y)
{
    if(x.first != y.first) return x.first > y.first;
    if(x.second != y.second) return x.second > y.second;
    return 1;
}
int main()
{
    init();
    cin >> x >> n;
    for(ll i = 0; i < n; i++)
    {
        ll u;
        pair<ll,ll> v;
        cin >> v.first >> u >> v.second;
        if(v.second > x) v.second = n;
        g[u].push_back(v);
    }

    for(auto &[w,v]:g)
    {
        sort(v.begin(), v.end(), greater<pair<ll,ll>>());
        vector<pair<ll,ll>> a;
        ll cnt = 0;
        for(ll i = 0; i < v.size(); i++)
        {
            cnt += v[i].second;
            if(cnt * w > x)
            {
                v = a;
                break;
            }
            else a.push_back(v[i]) ;
        }
    }

    for(auto &[w,v]:g)
    {
        for(ll i = 0; i < v.size(); i++)
        {
            for(ll k = 1; k <= v[i].second; k++)
            {
                for(ll j = x; j >= 0; j--)
                {
                    if(j + w > x) continue;
                    if(dp[j]) dp[j + w] = max(dp[j + w], dp[j] + v[i].first);
                    if(j == 0)
                        dp[w] = max(dp[w], v[i].first);
                }
            }
        }
    }

    ll ans = 0;
    for(ll i = 0; i <= x; i++) if(dp[i]) ans = max(ans, dp[i]);
    cout << ans;
}

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