Submission #645663

#	Time	Username	Problem	Language	Result	Execution time	Memory
645663		nayhz	Knapsack (NOI18_knapsack)	C++17	100 / 100	51 ms	1996 KiB

knapsack

// source identifier task_name
#pragma GCC optimize("Ofast")
#pragma GCC target("avx,avx2,fma")

#include <bits/stdc++.h>
#define lck cout << "ick bmi 32.9\n"
#define cam_cs cout << "ick orz\n"
#define orz(x) cout << (x) << " orz\n"

#define pii pair<int, int>
#define pll pair<long long, long long>
#define pcc pair<char, char>
#define ll long long
#define ull unsigned long long
#define ld long double
// #define int long long

#define vi vector<int>
#define vll vector<long long>
#define vd vector<double>
#define vpii vector<pair<int, int>>
#define vpll vector<pair<long long, long long>>
#define vc vector<char>
#define vsc vector<string>
#define vb vector<bool>

#define fi first
#define se second
#define pb push_back
#define mp make_pair
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()

#define yes() cout << "Yes\n"
#define no() cout << "No\n"
#define impossible() cout << "Impossible\n"

template<typename T, typename V>
inline void print (const std::pair<T, V> &x) {std::cout << x.first << ' ' << x.second << '\n';}
template<typename T>
inline void print (const T &x) {std::cout << x << '\n';}
template<typename T>
inline void print (std::vector<T> &x) {for (auto &y : x) std::cout << y << " "; std::cout << '\n';}
inline void print () {std::cout << '\n';}
using namespace std;

const ld pi = acos(-1);
const ld eps = 1e-9;
const ll mod = 1000000007;
const ll inf = 1000000007;

clock_t T, NT;
inline double get_time() {NT = clock() - T; return (double)(NT) / CLOCKS_PER_SEC;}

void file_io (string x);

/*
>>>>>>>>>>>>>>>>>>>>>>>>>>END OF TEMPLATE HEADER<<<<<<<<<<<<<<<<<<<<<<<<
*/

void solve (int &tc) {
	int s, n; cin >> s >> n;

	vpii a[2005];
	for (int i = 1; i <= n; i++) {
		int v, w, k; cin >> v >> w >> k;
		a[w].pb({v, k});
	}

	vi dp(2005);
	int ans = 0;
	for (int i = 1; i <= s; i++) {
		sort(all(a[i]), greater<pii>());

		int pt = 0;
		for (int j = 0; j < s / i; j++) {
			if (pt >= (int)(a[i].size())) break;
			for (int k = s; k >= i; k--) {
				dp[k] = max(dp[k], dp[k - i] + a[i][pt].fi);
				ans = max(ans, dp[k]);
			}
			a[i][pt].se--;
			if (a[i][pt].se == 0) pt++;
		}
	}
	print(ans);
}

signed main () {
	cin.tie()->sync_with_stdio(false);
	T = clock();
	srand(time(NULL));
	// file_io("");

	int t = 1;
	// cin >> t;
	for (int i = 1; i <= t; i++) {
		solve(i);
		// if (i != t) cout << '\n';
	}
	// while (true) {solve(t); t++;}
	return 0;
}

void file_io (string x = "x") {
	string i = x + ".in";
	freopen(i.c_str(), "r", stdin);
	string o = x + ".out";
	freopen(o.c_str(), "w", stdout);
}

Compilation message (stderr)

knapsack.cpp: In function 'void file_io(std::string)':
knapsack.cpp:107:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  107 |  freopen(i.c_str(), "r", stdin);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
knapsack.cpp:109:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  109 |  freopen(o.c_str(), "w", stdout);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

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