Submission #932245

#	Time	Username	Problem	Language	Result	Execution time	Memory
932245		Regulus	Knapsack (NOI18_knapsack)	C++17	100 / 100	39 ms	6660 KiB

knapsack

#include <bits/stdc++.h>
#define IO ios::sync_with_stdio(false);cin.tie(0);
#define debug(x) cerr << #x << " = " << (x) << ' '
#define bug(x) cerr << (x) << ' '
#define endl cerr << '\n'
#define all(v) (v).begin(), (v).end()
#define SZ(v) (ll)(v).size()
#define lowbit(x) (x)&-(x)
#define pb emplace_back
#define F first
#define S second
using namespace std;
using ll = long long;
using pll = pair<ll, ll>;
//#define TEST
const int N = 1e5+5;
ll wei[N], val[N], num[N], dp[2005], sum[N];
vector<ll> v[2005], com;

int main(void)
{ IO
    ll n, i, T;

    cin >> T >> n;
    for (i=1; i <= n; ++i)
        cin >> val[i] >> wei[i] >> num[i], v[wei[i]].pb(i);
    for (i=1; i <= 2000; ++i)
    {
        if (v[i].empty()) continue;
        com.clear();
        for (ll x : v[i]) com.pb(val[x]);
        sort(all(com)); com.resize(unique(all(com))-com.begin());
        for (ll j=0; j < SZ(com); ++j) sum[j] = 0;
        for (ll x : v[i])
        {
            auto it = lower_bound(all(com), val[x]) - com.begin();
            sum[it] += num[x];
        }
        
        ll tot = 0;
        for (ll t=SZ(com)-1; t >= 0; --t)
        {
            tot += sum[t];
            if (tot > T/i) sum[t] -= tot - T/i;
            for (ll j=1; sum[t] > 0; j <<= 1)
            {
                ll tmp = min(j, sum[t]);
                sum[t] -= tmp;
                for (ll k=T; k >= tmp*i; --k)
                {
                    dp[k] = max(dp[k], dp[k-tmp*i] + com[t]*tmp);
                }
            }
            if (tot > T/i) break;
        }
    }

    cout << dp[T] << '\n';

    return 0;
}

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