Submission #1204237

#	Time	Username	Problem	Language	Result	Execution time	Memory
1204237		raymoo_	Knapsack (NOI18_knapsack)	C++17	100 / 100	39 ms	3144 KiB

knapsack

#include<bits/stdc++.h>
using namespace std; 
#define fi first
#define se second
#define pb push_back
#define eb emplace_back
#define umap unordered_map
#define prq priority_queue
#define vect vector
#define rs resize
#define bend(v) v.begin(),v.end()
#define pob pop_back
#define pof pop_front
#define lwb lower_bound
#define upb upper_bound
#define pii pair<int,int>
#define nextl cout << '\n'
#define el '\n'
#define deb cout<<"\nok\n";return 
#define ll long long
#define int long long
#define dbl long double
#define popcnt __builtin_popcount
#define ctz __builtin_ctz

const ll INF=902337203695775807, N=2e5+69, MOD=1e9+7;    

void ffopen(const string& file){
    if(file.empty())return;
FILE *File = fopen((file+".inp").c_str(), "r");
if (File == NULL)return;
    freopen((file + ".inp").c_str(), "r", stdin);
    freopen((file + ".out").c_str(), "w", stdout);
}

int pm(int a,const int b=1e9+7){return ((a%b)+b)%b;}
int sq(int x){return x*x;}
ll __lcm(ll a, ll b, const ll lim=LLONG_MAX){
    if(a == -1 || b == -1)return -1;
    ll g = __gcd(a,b);
    if(b/g > lim/a)return -1;
    return (a/g)*b;
}

void sol(){
    int n, S;
    cin >> S >> n;
    vect<int> dp(S+1);
    vect<pii> a, w[S+1];
    for(int i=0;n>i;i++){
        int u, v, z;
        cin >> v >> u >> z;
        w[u].eb(v, z);
    }
    
    for(int i=0;S>=i;i++){
        sort(bend(w[i]), greater<pii>());
        int cnt = 0, p=0;
        while(p<w[i].size() && cnt<S/i){
            a.eb(i, w[i][p].fi);
            w[i][p].se--;
            cnt++;
            if(!w[i][p].se)p++;
        }
    }
    
    for(int i=0;a.size()>i;i++){
        for(int j=S;j>=a[i].fi;j--){
            dp[j] = max(dp[j], dp[j - a[i].fi] + a[i].se);
        }
    }

    cout << dp[S];

}

signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    ffopen("");
    int t=1;
    //cin >> t;
    while(t--)sol();
}
/*
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*/

Compilation message (stderr)

knapsack.cpp: In function 'void ffopen(const string&)':
knapsack.cpp:32:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   32 |     freopen((file + ".inp").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
knapsack.cpp:33:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   33 |     freopen((file + ".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