Submission #1043879

#	Time	Username	Problem	Language	Result	Execution time	Memory
1043879		Khanhcsp2	Knapsack (NOI18_knapsack)	C++14	100 / 100	67 ms	5344 KiB

knapsack

#include<bits/stdc++.h>
#define el '\n'
#define fi first
#define sc second
#define int ll
#define pii pair<int, int>
#define all(v) v.begin(), v.end()
using namespace std;
using ll=long long;
using ull=unsigned long long;
using ld=long double;
const int mod=1e9+7;
const int N=1e5+11;
int s, n, sz[N], dp[2011][2];
struct gg
{
    int v, w, sl;
}a[N];
bool cmp(gg x, gg y)
{
    return x.v>y.v;
}
vector<pii> v;
void sol()
{
    cin >> s >> n;
    for(int i=1;i<=n;i++) cin >> a[i].v >> a[i].w >> a[i].sl;
    sort(a+1, a+n+1, cmp);
    v.push_back({0, 0});
    for(int i=1;i<=s;i++) sz[i]=s/i;
    for(int i=1;i<=n;i++)
    {
        for(int j=1;j<=a[i].sl;j++)
        {
            if(sz[a[i].w])
            {
                v.push_back({a[i].v, a[i].w});
                sz[a[i].w]--;
            }
            else break;
        }
    }
    n=v.size();
    for(int i=1;i<=n;i++) for(int j=0;j<=s;j++) dp[j][i]=-1e9;
    dp[0][0]=0;
//    for(auto x:v) cout << x.fi << ' ' << x.sc << el;
    for(int i=1;i<=n;i++)
    {
        for(int j=v[i].sc;j<=s;j++)
        {
            dp[j][i%2]=max(dp[j][i%2], dp[j-v[i].sc][(i-1)%2]+v[i].fi);
        }
        for(int j=0;j<=s;j++) dp[j][i%2]=max(dp[j][i%2], dp[j][(i-1)%2]);
    }
    int ans=0;
    for(int i=0;i<=1;i++) for(int j=0;j<=s;j++) ans=max(ans, dp[j][i]);
    cout << ans;
}
signed main()
{
//    freopen("divisor.INP", "r", stdin);
//    freopen("divisor.OUT", "w", stdout);
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int t=1;
    //cin >> t;
    while(t--)
    {
        sol();
    }
}

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