Submission #986971

#	Time	Username	Problem	Language	Result	Execution time	Memory
986971		Codurr	Knapsack (NOI18_knapsack)	C++14	49 / 100	1070 ms	472 KiB

knapsack

#include "bits/stdc++.h"
using namespace std;

#define int long long //Avoid if time complexity very close to limit
#define ll long long
#define sz(x) (int)((x).size())
#define all(x) (x).begin(),(x).end()
#define rall(x) (x).rbegin(),(x).rend()
#define f first
#define s second

void setIO(string s="") {
    ios_base::sync_with_stdio(0); cin.tie(0);
    if(sz(s)) {
        freopen((s+".in").c_str(),"r",stdin);
        freopen((s+".out").c_str(),"w",stdout);
    }
}

//Imp consts
const int MOD=1e9+7;
const int MAXN=2e5+1;
const int INF=1e18+5;
const double pi=3.14159265358979323846;
const double ep=1e-20;

signed main() {
    setIO();
    int S,n;
    cin>>S>>n;
    vector<int> val,pr,cnt;  
    for(int i=0;i<n;i++) {
        int x,y,z;
        cin>>x>>y>>z;
        val.push_back(x);
        pr.push_back(y);
        cnt.push_back(z);
    }
    vector<int> dp(S+1,-1);
    dp[0]=0;
    if(n==1) {
        int ans=min(cnt[0],(S/pr[0]))*val[0];
        cout<<ans;
        return 0;
    }
    for(int i=0;i<n;i++) {
        int v=val[i],p=pr[i],c=cnt[i];
        for(int j=S;j>=0;j--) {
            for(int l=1;l<=c;l++) {
                if(j>=l*p&&dp[j-l*p]>=0)
                    dp[j]=max(dp[j],dp[j-l*p]+v*l);
            }
        }
    }
    int ans=0;
    for(auto u:dp)
        ans=max(ans,u);
    cout<<ans;
    return 0;
}

Compilation message (stderr)

knapsack.cpp: In function 'void setIO(std::string)':
knapsack.cpp:15:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   15 |         freopen((s+".in").c_str(),"r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
knapsack.cpp:16:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   16 |         freopen((s+".out").c_str(),"w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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