Submission #437461

#	Time	Username	Problem	Language	Result	Execution time	Memory
437461		KazamaHoang	Knapsack (NOI18_knapsack)	C++14	100 / 100	79 ms	1752 KiB

knapsack

/* -> Written by <-
   -----------
  |K_A_Z_A_M_A|
  |___________|
  |    ___    |
  |   (^_^)   |
  |  /( | )\  |
  |____|_|____|
    H O A N G
*/

//#pragma GCC target("avx2")
//#pragma GCC optimize("O3")
//#pragma GCC optimize("unroll-loops")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")

#include <bits/stdc++.h>
//#include <ext/pb_ds/assoc_container.hpp>
//#include <ext/pb_ds/tree_policy.hpp>

using namespace std;
//using namespace __gnu_pbds;
using ll = long long;
using db = long double;
//using int = long long

#define Task            "cowjog"
#define F               first
#define S               second
#define eb              emplace_back
#define sz(x)           ((int)x.size())
#define all(x)          x.begin(), x.end()
#define bit(x, i)       (((x) >> (i)) & 1)
#define endl            '\n'
#define fr(i,a,b)       for (int i = (int)(a); i <= (int)(b); ++ i)
#define FR(i,a,b)       for (int i = (int)(a); i < (int)(b); ++ i)
#define frr(i,a,b)      for (int i = (int)(a); i >= (int)(b); -- i)
#define fre(i, a)       for (auto &i : a)
#define debug(x)        cerr << #x << " is " << x << "\n";
//#define ordered_set     tree<int, null_type, less<int>, rb_tree_tag, tree_order_statistics_node_update>

const int MOD = 1e9 + 7;
const ll MM = (ll)MOD * MOD;
const int base = 331;
const int B = 32;
const int inf = 1e9 + 7;
const ll INF = 1e18 + 7;
const int dx8[] = {0, 0, 1, 1, 1, -1, -1, -1};
const int dy8[] = {1, -1, 0, 1, -1, 0, 1, -1};
const int dx4[] = {0, 0, 1, -1};
const int dy4[] = {1, -1, 0, 0};

int s, n;
vector <pair <int, int>> e[2005];
pair <int, int> a[100005];
int dp[2005];

void solve(int test_case) {
    cin >> s >> n;
    fr(i, 1, n) {
        int v, w, k;
        cin >> v >> w >> k;
        e[w].eb(v, k);
    }
    n = 0;
    fr(w, 1, s) {
        sort(all(e[w]), greater <pair <int, int>> ());
        int bef = n;
        fre(p, e[w]) {
            fr(j, 1, p.S) {
                if ((n+1-bef) * w > s)
                    break;
                a[++n] = {w, p.F};
            }
        }
    }
    fr(i, 1, s)
        dp[i] = - 2e9 - 7;
    fr(i, 1, n) {
        frr(j, s, 0)
            if (j + a[i].F <= s)
                dp[j+a[i].F] = max(dp[j+a[i].F], dp[j] + a[i].S);
    }
    int res = - 2e9 - 7;
    fr(i, 0, s)
        res = max(res, dp[i]);
    cout << res;
}

signed main(){
    cin.tie(0)->sync_with_stdio(0);
    if (fopen(".inp", "r")) {
        freopen(".inp", "r", stdin);
        freopen(".out", "w", stdout);
        freopen(".ou", "w", stderr);
    }
    else if (fopen(Task".in", "r")) {
        freopen(Task".in", "r", stdin);
        freopen(Task".out", "w", stdout);
    }
    int test_case = 1;
//    cin >> test_case;
//    prepare();
    for (int i = 1; i <= test_case; ++ i) {
        solve(i);
//        bf();
    }
    return 0;
}

Compilation message (stderr)

knapsack.cpp: In function 'int main()':
knapsack.cpp:93:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   93 |         freopen(".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~
knapsack.cpp:94:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   94 |         freopen(".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~
knapsack.cpp:95:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   95 |         freopen(".ou", "w", stderr);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~
knapsack.cpp:98:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   98 |         freopen(Task".in", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
knapsack.cpp:99:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   99 |         freopen(Task".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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