Submission #438694

#	Time	Username	Problem	Language	Result	Execution time	Memory
438694		Haidara	Knapsack (NOI18_knapsack)	C++17	100 / 100	148 ms	2884 KiB

knapsack

/* * * * * * * * * *
 *   ID: Haidara   *
 *   LANG: C++17   *
 *   PROB:         *
 * * * * * * * * * */
#include<bits/stdc++.h>
#define fast ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
#define int long long
#define rep(i,x,n) for(int i=x;i<n;i++)
#define FOR(i,n) rep(i,0,n)
#define per(i,x,n) for(int i=x;i>n;i--)
#define ROF(i,x) for(int i=x;i>=0;i--)
#define v(i) vector< i >
#define p(i,j) pair< i , j >
#define pii pair<int,int>
#define m(i,j) map< i , j >
#define pq(i) priority_queue< i >
#define ff first
#define all(x) x.begin(),x.end()
#define ss second
#define pp push_back
using namespace std;
void SIO(string name="")
{
    if(name!="")
    {
        freopen((name+".in").c_str(),"r",stdin);
        freopen((name+".out").c_str(),"w",stdout);
    }
}
const int inf=1LL<<62LL;
const int mod=1e9+7;
const int maxn=2002;
v(pii)a[maxn];
int dp[maxn];
signed main()
{
    SIO("");
    int s,n,ans=0;
    cin>>s>>n;
    FOR(i,n)
    {
        int v,w,k;
        cin>>v>>w>>k;
        a[w].pp({v,k});
    }
    rep(i,1,s+1)
    {
        sort(all(a[i]));
        reverse(all(a[i]));
        int inx=0;
        FOR(j,s/i)
        {
            if(inx==a[i].size())
                break;
            for(int k=s;k>=i;k--)
            {
                dp[k]=max(dp[k],dp[k-i]+a[i][inx].ff);
                ans=max(ans,dp[k]);
            }
            a[i][inx].ss--;
            if(!a[i][inx].ss)
                inx++;
        }
    }
    cout<<ans;
}

Compilation message (stderr)

knapsack.cpp: In function 'int main()':
knapsack.cpp:54:19: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   54 |             if(inx==a[i].size())
      |                ~~~^~~~~~~~~~~~~
knapsack.cpp: In function 'void SIO(std::string)':
knapsack.cpp:27:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   27 |         freopen((name+".in").c_str(),"r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
knapsack.cpp:28:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   28 |         freopen((name+".out").c_str(),"w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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