Submission #1085911

#	Time	Username	Problem	Language	Result	Execution time	Memory
1085911		vjudge1	Knapsack (NOI18_knapsack)	C++14	100 / 100	66 ms	33372 KiB

knapsack

/**
｡∠(*・ω･)っ  ⌒ 由 ~    ((　,,・з・,,　))
 _Π_____。
/______/~＼
｜ 田田｜門｜
why im so dumb man >.<
**/
#include <bits/stdc++.h>
using namespace std;

#define fi first
#define se second
#define pb push_back
#define sz(x) (int)(x).size()
#define el "\n"

typedef long long ll;
typedef pair<int,int> pii;
// var dec
const int maxn = 2e3 + 3;
int n, s;
// ds dec

//
void solve()
{
    cin >> s >> n;
    map <int, vector<pii>> mp;
    for (int i=1; i<=n; ++i)
    {
        int v, w, k; cin >> v >> w >> k;
        mp[w].pb({v, k});
    }
    vector <vector<ll>> dp(sz(mp)+3, vector<ll>(s+3, -1));
    int i = 1;
    dp[0][0] = 0;
    for (auto x: mp)
    {
        int w = x.fi;
        vector <pii> v = x.se;
        sort(v.begin(), v.end(), greater<pii>());
        for (int j=0; j<=s; ++j)
        {
            dp[i][j] = dp[i-1][j];
            int items = 0;
            int cur = 0;
            int copies = v[cur].se;
            ll profit = 0;
            while ((items+1)*w <= j && cur < sz(v))
            {
                profit += v[cur].fi;
                ++items;
                if (dp[i-1][j-items*w] != -1) dp[i][j] = max(dp[i][j], dp[i-1][j-items*w] + profit);
                --copies;
                if (copies == 0)
                {
                    ++cur;
                    copies = v[cur].se;
                }
            }
        }
        ++i;
    }
    ll ans = 0;
    for (int j=0; j<=s; ++j)
        ans = max(ans, dp[sz(mp)][j]);
    cout << ans << el;
}
//
int32_t main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    if (fopen("lmao.inp", "r"))
    {
        freopen("lmao.inp", "r", stdin);
        freopen("lmao.out", "w", stdout);
    }
    int t = 1;
//    cin >> t;
    while (t--) solve();
    return 0;
}

Compilation message (stderr)

knapsack.cpp: In function 'int32_t main()':
knapsack.cpp:76:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   76 |         freopen("lmao.inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
knapsack.cpp:77:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   77 |         freopen("lmao.out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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