Submission #447010

#	Time	Username	Problem	Language	Result	Execution time	Memory
447010		cpp219	Knapsack (NOI18_knapsack)	C++14	100 / 100	74 ms	3692 KiB

knapsack

#pragma GCC optimization O2
#pragma GCC optimization "unroll-loop"
#pragma target ("avx2")

#include <bits/stdc++.h>
#define ll int
#define ld long double
#define fs first
#define sc second
using namespace std;
typedef pair<ll,ll> LL;
const ll N = 2e3 + 9;
const ll Log2 = 21;
const ll inf = 1e9 + 7;

vector<LL> v[N];
ll s,n,a,b,c,dp[N];

int main(){
    ios_base::sync_with_stdio(NULL); cin.tie(0); cout.tie(0);
    #define task "tst"
    if (fopen(task".INP","r")){
        freopen(task".INP","r",stdin);
        //freopen(task".OUT","w",stdout);
    }
    cin>>s>>n;
    for (ll i = 1;i <= n;i++){
        cin>>a>>b>>c;
        v[b].push_back({a,c});
    }
    for (ll i = 1;i <= s;i++){
        sort(v[i].begin(),v[i].end(),greater<LL> ());
        ll total = i;
        for (auto now : v[i]){
            if (total > s) break;
            for (ll j = 1;j <= now.sc&&total <= s;j++,total += i)
                for (ll k = s;k >= i;k--)
                    dp[k] = max(dp[k],dp[k - i] + now.fs);
        }
    }
    cout<<dp[s];
}

Compilation message (stderr)

knapsack.cpp:1: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas]
    1 | #pragma GCC optimization O2
      | 
knapsack.cpp:2: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas]
    2 | #pragma GCC optimization "unroll-loop"
      | 
knapsack.cpp:3: warning: ignoring '#pragma target ' [-Wunknown-pragmas]
    3 | #pragma target ("avx2")
      | 
knapsack.cpp: In function 'int main()':
knapsack.cpp:23:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   23 |         freopen(task".INP","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

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