Submission #1193286

#	Time	Username	Problem	Language	Result	Execution time	Memory
1193286		dprto	Knapsack (NOI18_knapsack)	C++20	73 / 100	1093 ms	1608 KiB

knapsack

#include <bits/stdc++.h>
using namespace std; 
#define ll long long
#define pll pair<long long,long long>
#define f(i,n) for(long long i=1;i<=n;i++)
#define fi first
#define se second
#define mll map<long long,long long>
#define sll set<long long>
const ll du=1e9+7;

int main() {
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    #define task "test"
    if (fopen(task".inp", "r")) {
        freopen(task".inp", "r", stdin);
        freopen(task".out", "w", stdout);
    }
    int n,s;
    cin>>s>>n;
    int w[n+1],v[n+1],c[n+1];
    vector<ll> dp(s+1,0);
    for(int i=1;i<=n;i++){
        cin>>v[i]>>w[i]>>c[i];
        vector<pll> bag;
        ll cur=1,rem=c[i];
        while(rem>0){
            if(cur<=rem){
                rem-=cur;
                bag.push_back({v[i]*cur,w[i]*cur});
                cur*=2;
            }
            else break;
        }
        if(rem>0)
            bag.push_back({v[i]*rem,w[i]*rem});
        for(pll x:bag){
            for(ll j=s;j>=x.se;j--){
                dp[j]=max(dp[j],dp[j-x.se]+x.fi);
            }
        }
    }
    cout<<dp[s];
}

Compilation message (stderr)

knapsack.cpp: In function 'int main()':
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(task".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
knapsack.cpp:17:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   17 |         freopen(task".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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